CN222259619U - Optical fiber Bragg grating inscription system - Google Patents
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- CN222259619U CN222259619U CN202421197885.4U CN202421197885U CN222259619U CN 222259619 U CN222259619 U CN 222259619U CN 202421197885 U CN202421197885 U CN 202421197885U CN 222259619 U CN222259619 U CN 222259619U
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Abstract
The application relates to a writing system of an optical fiber Bragg grating, which comprises a femtosecond laser, a spatial light modulator and a writing platform, wherein the femtosecond laser is used for emitting femtosecond laser, the spatial light modulator is used for modulating the femtosecond laser into a cylindrical lens linear light field, and the writing platform is used for receiving the cylindrical lens linear light field and providing a writing space of the optical fiber Bragg grating. Modulating the femtosecond laser (focusing focus state) into a cylindrical lens linear light field mainly through a spatial light modulator, writing a fiber Bragg grating based on the cylindrical lens linear light field, the writing is a surface processing technology, so that the optical fiber Bragg grating writing system has the advantages of high writing quality and high writing efficiency, and the problems of low writing quality and low writing efficiency of the conventional optical fiber Bragg grating writing system are solved.
Description
Technical Field
The application relates to the field of micro-nano manufacturing, in particular to a writing system of an optical fiber Bragg grating.
Background
The Fiber Bragg Grating (FBG) has important application value in the field of optical fiber communication, and can be used as a wavelength division multiplexer, a gain flattening device of an optical fiber amplifier, a dispersion compensator, an all-optical network add-drop, a wavelength route, optical exchange and the like. In the conventional method, an ultraviolet continuous or excimer laser is mainly used to write a fiber bragg grating on a photosensitive fiber. The fiber Bragg grating prepared by the method has the defects of poor thermal stability, easy erasure at high temperature, complicated fiber hydrogen carrying pretreatment and inapplicability to high temperature environment. Correspondingly, the fiber Bragg grating prepared by the femtosecond laser micro-nano processing technology can overcome the defects of the fiber Bragg grating to a certain extent.
In a femtosecond laser point-by-point writing system, a limited target area generated by a single pulse can cause a local effect, so that strong cladding mode loss is generated, and the writing quality of the fiber Bragg grating is further reduced. Meanwhile, the femtosecond laser point-by-point writing system has the problem of low writing efficiency.
Disclosure of utility model
The utility model provides a system and a system for writing an optical fiber Bragg grating and a grating writing regulation method, which are used for solving the problems of low writing quality and low writing efficiency of the conventional optical fiber Bragg grating writing system.
In a first aspect, the present utility model provides a writing system for a fiber bragg grating, the writing system comprising:
a femtosecond laser for emitting a femtosecond laser;
The spatial light modulator is used for modulating the femtosecond laser into a cylindrical lens linear light field;
And the inscription platform is used for receiving the cylindrical lens linear light field and providing inscription space of the fiber Bragg grating.
In some of these embodiments, the spatial light modulator is a dynamic spatial light modulator.
In some of these embodiments, the dynamic spatial light modulator is configured to modulate the femtosecond laser light into a cylindrical lens line-shaped light field according to a cylindrical wave hologram.
In some of these embodiments, the inscription system further comprises:
The energy regulation and control device is arranged at the output side of the femtosecond laser and is used for regulating and controlling the energy of the femtosecond laser;
The beam expander is used for expanding the femtosecond laser after energy regulation and control and transmitting the femtosecond laser after the beam expansion to the spatial light modulator;
the spatial light modulator is arranged on the output side of the beam expander.
In some embodiments, the energy modulation device comprises a half-wave plate and a polarizing beam splitter;
The half-wave plate is arranged on the output side of the femtosecond laser, and the polarized beam splitter is arranged on the output side of the half-wave plate.
In some of these embodiments, the inscription system further comprises:
And the objective lens is used for focusing the cylindrical lens linear light field and transmitting the focused cylindrical lens linear light field to the inscription platform.
In some of these embodiments, the inscription system further comprises:
The illumination light source is arranged at one side of the writing platform;
The image detection device is used for detecting the cylindrical lens linear light field;
A dichroic mirror disposed on the output side of the spatial light modulator for conducting the cylindrical lens line-shaped light field to the objective lens and the reflected light field of the inscription platform to the image detection device;
the objective lens is disposed on the output side of the dichroic mirror.
In some of these embodiments, the inscription system further comprises:
And a computer electrically connected to the spatial light modulator for providing a cylindrical lens hologram to the spatial light modulator.
In some of these embodiments, the inscription system further comprises:
the reflecting mirror is arranged at the output side of the energy regulating device and is used for regulating the propagation path of the femtosecond laser after energy regulation;
the beam expander is arranged at the output side of the reflector.
In some of these embodiments, the inscription system further comprises:
The energy regulation and control device is arranged at the output side of the femtosecond laser and is used for regulating and controlling the energy of the femtosecond laser;
the reflecting mirror is arranged at the output side of the energy regulating device and is used for regulating the propagation path of the femtosecond laser after energy regulation;
The beam expander is arranged at the output side of the reflector and is used for expanding the femtosecond laser after energy regulation and control and transmitting the femtosecond laser after the beam expansion to the spatial light modulator;
The spatial light modulator is arranged on the output side of the beam expander;
the objective lens is used for focusing the cylindrical lens linear light field and transmitting the focused cylindrical lens linear light field to the inscription platform;
The illumination light source is arranged at one side of the writing platform;
The image detection device is used for detecting the cylindrical lens linear light field;
A dichroic mirror disposed on the output side of the spatial light modulator for conducting the cylindrical lens line-shaped light field to the objective lens and the reflected light field of the inscription platform to the image detection device;
the objective lens is disposed on the output side of the dichroic mirror.
Compared with the related art, the optical fiber Bragg grating inscription system provided by the utility model modulates the femtosecond laser (focusing focus state) into the cylindrical lens linear light field through the spatial light modulator, inscribes the optical fiber Bragg grating based on the cylindrical lens linear light field, and has the advantages of high inscription quality and high inscription efficiency because the inscription is a surface processing technology, thereby solving the problems of low inscription quality and low inscription efficiency of the conventional optical fiber Bragg grating inscription system.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
FIG. 1 is a block diagram of a writing system for a fiber Bragg grating according to one embodiment of the present utility model;
FIG. 2 is an illustration of a different angle cylindrical wave hologram in some embodiments of the utility model;
FIG. 3 is a representation of a linear light field of a cylindrical lens of different angles in some embodiments of the utility model;
FIG. 4 is an illustration of a different angle fiber Bragg grating in some embodiments of the present utility model;
FIG. 5 is a graph of transmission spectra of a fiber Bragg grating according to an embodiment of the present utility model;
FIG. 6 is a graph of transmission spectra of a fiber Bragg grating in accordance with another embodiment of the present utility model.
Detailed Description
The present application will be described and illustrated with reference to the accompanying drawings and examples for a clearer understanding of the objects, technical solutions and advantages of the present application.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," "these" and similar terms in this application are not intended to be limiting in number, but may be singular or plural. The terms "comprises," "comprising," "includes," "including," "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, and system, article, or apparatus that comprises a list of steps or modules (units) is not limited to the list of steps or modules (units), but may include other steps or modules (units) not listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in this disclosure are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes the association relationship of the association object, and indicates that three relationships may exist, for example, "a and/or B" may indicate that a exists alone, a and B exist simultaneously, and B exists alone. Typically, the character "/" indicates that the associated object is an "or" relationship. The terms "first," "second," "third," and the like, as referred to in this disclosure, merely distinguish similar objects and do not represent a particular ordering for objects.
The utility model also provides a system for inscribing the fiber Bragg grating, which is used for inscribing the fiber Bragg grating.
Fig. 1 is a block diagram of a writing system for a fiber bragg grating according to an embodiment of the present utility model. Referring to fig. 1, the inscription system includes a femtosecond laser 1, a spatial light modulator 6, and an inscription platform 9.
The optical fiber Bragg grating comprises a femtosecond laser 1, a spatial light modulator 6 and a writing platform 9, wherein the femtosecond laser 1 is used for emitting femtosecond laser, the spatial light modulator 6 is used for modulating the femtosecond laser into a cylindrical lens linear light field, and the writing platform 9 is used for receiving the cylindrical lens linear light field and providing a writing space of the optical fiber Bragg grating.
In the operation process of the writing system, the femtosecond laser 1 emits femtosecond laser to the spatial light modulator 6, the spatial light modulator 6 modulates the femtosecond laser into a cylindrical lens linear light field and transmits the cylindrical lens linear light field to the writing platform 9, and the writing of the fiber Bragg grating is performed on the writing platform 9 based on the cylindrical lens linear light field. Specifically, the stripped single-mode optical fiber is fixed on the inscription platform 9, then the position of the linear optical field of the cylindrical lens in the single-mode optical fiber is adjusted, and finally the inscription platform 9 is controlled to drive the single-mode optical fiber to move. In the process, the refractive index of the single-mode fiber is modulated by the linear light field of the cylindrical lens, so that the fiber Bragg grating is formed.
The key in the scheme is that the spatial light modulator 6 is adopted to modulate the femtosecond laser into a cylindrical lens linear light field, and the cylindrical lens linear light field irradiates on the inscription platform 9, so that the optical fiber Bragg grating can be inscribed. The femtosecond laser is modulated into a cylindrical lens linear light field, so that the energy of the femtosecond laser 1 can be utilized to a greater extent, and the energy utilization efficiency is improved. Meanwhile, the optical fiber Bragg grating is subjected to surface processing on the writing platform 9 based on the cylindrical lens linear light field, and compared with the existing femtosecond laser point-by-point writing system, strong cladding mode loss is not generated, so that the writing quality of the optical fiber Bragg grating is improved, and the writing efficiency of the optical fiber Bragg grating is improved.
In summary, the optical fiber bragg grating writing system provided by the utility model mainly modulates the femtosecond laser (focusing focus state) into the cylindrical lens linear light field through the spatial light modulator 6, and writes the optical fiber bragg grating based on the cylindrical lens linear light field.
Furthermore, the spatial light modulator 6 adopts a dynamic spatial light modulator (adjustable spatial light modulator), and different modulation of the femtosecond laser can be realized by adopting the spatial light modulator 6 according to different control information input from the outside, so that different cylindrical lens linear light fields are output. The control information of the spatial light modulator 6 may be a cylindrical wave hologram, that is, the dynamic spatial light modulator is configured to modulate the femtosecond laser light into a cylindrical lens linear light field according to the cylindrical wave hologram.
Thus, in some of these embodiments, modulating the femtosecond laser into a cylindrical lens line-shaped light field includes modulating the femtosecond laser into a cylindrical lens line-shaped light field according to a cylindrical lens hologram.
In the above-described embodiment, the desired cylindrical wave hologram may be generated by a computer and loaded into the spatial light modulator 6. At the moment, different cylindrical wave holograms can be generated by adjusting parameters of the cylindrical wave holograms, so that flexible regulation and control of linear light fields of the cylindrical lenses are realized, and inclined fiber Bragg gratings with different angles can be written conveniently.
FIG. 2 is an illustration of different angle cylindrical wave holograms in some embodiments of the utility model. FIG. 3 is a representation of a linear light field of a cylindrical lens of different angles in some embodiments of the utility models. Fig. 4 is an illustration of a different angle fiber bragg grating in some embodiments of the present utility model.
Referring to fig. 2, the inclination angles of the cylindrical wave holograms from left to right are-1 °,4 °,9 °, and 14 °, respectively. When the inclination angle of the spatial light modulator 6 is 1 °, the cylindrical lens linear light field generated by the spatial light modulator 6 is as shown in fig. 3. Referring to fig. 3, the inclination angles of the cylindrical lens line light field from left to right are 0 °,5 °,10 °, and 15 °, respectively. The final written fiber bragg grating is shown in fig. 4. Referring to fig. 4, the inclination angles of the fiber bragg gratings from left to right are 0 °,5 °,10 °, and 15 °, respectively.
Accordingly, in other embodiments, the spatial light modulator 6 may also employ a static spatial light modulator (fixed spatial light modulator) or a modulating element (digital reflective micromirror, lenticular lens, binary diffraction plate, and liquid crystal phase plate). In these embodiments, a different cylindrical lens linear light field can be generated by changing a different spatial light modulator 6, and tilted fiber bragg gratings of different angles can also be written.
Further, the writing system usually needs to include an energy modulation device, a beam expander 5, and an objective lens 8 in addition to the key parts of the femtosecond laser 1, the spatial light modulator 6, and the writing stage 9.
The energy regulating device is arranged on the output side of the femtosecond laser 1 and used for regulating and controlling the energy of the femtosecond laser, the beam expander 5 is used for expanding the beam of the femtosecond laser with regulated and controlled energy and transmitting the expanded femtosecond laser to the spatial light modulator 6, the spatial light modulator 6 is arranged on the output side of the beam expander 5, and the objective lens 8 is used for focusing the cylindrical lens linear light field and transmitting the focused cylindrical lens linear light field to the writing platform 9.
In the operation process of the writing system, the femtosecond laser emitted by the femtosecond laser 1 firstly passes through the energy regulation device, then passes through the beam expander 5, then reaches the spatial light modulator 6, and the cylindrical lens linear light field emitted by the spatial light modulator 6 is focused by the objective lens 8 and then is transmitted to the writing platform 9.
In some of these embodiments, the energy modulation device comprises a half-wave plate 2 and a polarizing beam splitter 3. The half-wave plate 2 is provided on the output side of the femtosecond laser 1, and the polarizing beam splitter 3 is provided on the output side of the half-wave plate 2. The femtosecond laser emitted by the femtosecond laser 1 firstly passes through the half wave plate 2, then passes through the polarized beam splitter 3 and then is conducted to the beam expander 5.
It should be noted that the combination of the half-wave plate 2 and the polarizing beam splitter 3 is only one specific form of the energy modulation device. In other embodiments, the energy modulation device may also be a gradient filter.
To enable monitoring of the inscription process, in some of these embodiments the inscription system further comprises an illumination source 10 arranged on the side of the inscription platform 9, an image detection device 12 and a dichroic mirror 7 arranged on the output side of the spatial light modulator, the objective 8 being arranged on the output side of the dichroic mirror 7.
The image detection means 12 are arranged to detect the cylindrical lens line field, and the dichroic mirror 7 is arranged to conduct the cylindrical lens line field to the objective lens 8 and to conduct the reflected field of the writing stage 9 to the image detection means 12. Among them, the dichroic mirror 7 has a characteristic of reflecting only light of a specific wavelength, that is, light having a wavelength within a specific range is reflected by the dichroic mirror, and light having a wavelength outside the specific range is directly transmitted through the dichroic mirror. Furthermore, the light reflection/projection characteristics of the dichroic mirror 7 are related to the own structure, that is, the dichroic mirrors 7 of different structures have different reflection wavelength ranges. In this embodiment the cylindrical lens line field and the reflected field of the writing stage 9 have different wavelengths, so that the corresponding reflection/transmission requirements are fulfilled by selecting a suitable dichroic mirror 7. Specifically, in one embodiment, dichroic mirror 7 reflects a cylindrical lens line light field and allows transmission of the reflected light field of writing stage 9. In another embodiment, dichroic mirror 7 reflects the reflected light field of inscription platform 9 and allows cylindrical lens line light field transmission. It should be noted that, the dichroic mirror 7 needs to be at an acute angle rather than a perfectly perpendicular angle, such as a 45 ° angle, with respect to the propagation path of the reflected light field or the cylindrical lens linear light field of the writing stage 9.
In the operation process of the writing system, the illumination light source 10 is turned on, the cylindrical lens linear light field emitted by the spatial light modulator 6 irradiates on the dichroic mirror 7, the cylindrical lens linear light field reflected by the dichroic mirror 7 enters the objective lens 8, the cylindrical lens linear light field focused by the objective lens 8 irradiates on the optical fiber on the writing platform 9, and the light field is collected by the image detection device 12 through the dichroic mirror 7 after being reflected. Wherein a lens 11 may be provided between the dichroic mirror 7 and the image detection means 12. The image detection device 12 may employ a CCD (Charge Coupled Device ).
In order to realize the control of the inscription system, the inscription system comprises in particular also a computer 13. The computer 13 is at least used for controlling the movement of the writing platform 9 so as to realize the writing of the optical fiber on the writing platform 9.
In embodiments where the spatial light modulator 6 employs a dynamic spatial light modulator (tunable spatial light modulator 6), the computer 13 is electrically connected to the spatial light modulator 6 and is further configured to provide a cylindrical lens hologram to the spatial light modulator 6, i.e., the computer 13 generates and records the cylindrical lens hologram into the spatial light modulator 6 based on user input. At the moment, different cylindrical wave holograms can be generated by adjusting parameters of the cylindrical wave holograms, so that flexible regulation and control of linear light fields of the cylindrical lenses are realized, and inclined fiber Bragg gratings with different angles can be written conveniently.
In embodiments where the inscription system further comprises an illumination source 10, an image detection means 12 and a dichroic mirror 7 arranged at one side of inscription platform 9, computer 13 is also arranged to control image detection means 12.
It should be noted that, the specific pose relationship between each component in the writing system is determined according to the matching relationship of each component, and it is mainly required to ensure that the next component can receive the light emitted by or penetrating through the previous component. Wherein for compact inscription systems, in some embodiments the inscription system further comprises a mirror 4 arranged at the output side of the energy modulation device for adjusting the propagation path of the energy modulated femtosecond laser, and a beam expander 5 arranged at the output side of the mirror 4.
As above, at least one embodiment of each part of the writing system of the fiber bragg grating provided by the present utility model has been described separately. It should be noted that the portions of the writing system of the fiber bragg grating may be combined in different embodiments, thereby forming different embodiments of the writing system of the fiber bragg grating.
For example, in one specific overall embodiment, the writing system of the fiber Bragg grating comprises a femtosecond laser 1, an energy modulation device, a reflecting mirror 4, a beam expander 5, a spatial light modulator 6, a dichroic mirror 7, an objective lens 8, a writing stage 9, an illumination light source 10, a lens 11, an image detection device 12 and a computer. Wherein the spatial light modulator 6 is a dynamic spatial light modulator.
The femtosecond laser 1 is used for emitting femtosecond laser, the spatial light modulator 6 is used for modulating the femtosecond laser into a cylindrical lens linear light field, and the writing platform 9 is used for receiving the cylindrical lens linear light field and providing a writing space of the fiber Bragg grating. The energy modulation device is arranged on the output side of the femtosecond laser 1 and used for carrying out energy modulation on the femtosecond laser, the reflecting mirror 4 is arranged on the output side of the energy modulation device and used for modulating the propagation path of the energy modulated femtosecond laser, the beam expander 5 is arranged on the output side of the reflecting mirror 4 and used for expanding the energy modulated femtosecond laser and transmitting the expanded femtosecond laser to the spatial light modulator 6, the spatial light modulator 6 is arranged on the output side of the beam expander 5, the objective lens 8 is used for focusing the cylindrical lens linear light field and transmitting the focused cylindrical lens linear light field to the inscribing platform 9, the illumination light source 10 is arranged on the side of the inscribing platform 9, the image detection device 12 is used for detecting the cylindrical lens linear light field, and the dichroic mirror 7 is arranged on the output side of the spatial light modulator 6 and used for transmitting the cylindrical lens linear light field to the objective lens 8 and transmitting the reflected light field of the inscribing platform 9 to the image detection device 12.
In the operation process of the writing system, the femtosecond laser emitted by the femtosecond laser 1 firstly passes through the energy regulation device, then passes through the beam expander 5 and then reaches the spatial light modulator 6, the spatial light modulator 6 modulates the femtosecond laser into a cylindrical lens linear light field, the cylindrical lens linear light field emitted by the spatial light modulator 6 irradiates on the dichroic mirror 7, the cylindrical lens linear light field enters the objective lens 8 after being reflected by the dichroic mirror 7, the cylindrical lens linear light field focused by the objective lens 8 irradiates on an optical fiber on the writing platform 9, and the light field is collected by the image detection device 12 after being reflected by the dichroic mirror 7. In the process, the refractive index of the single-mode fiber is modulated by the linear light field of the cylindrical lens, so that the fiber Bragg grating is formed. The computer is used for controlling the writing stage 9, the image detection means 12 and the spatial light modulator 6.
In connection with the optical fiber bragg grating writing system provided in the above embodiment, two embodiments of the optical fiber bragg grating writing method (the inclination angle of the spatial light modulator 6 is 1 °) are described as follows.
In one embodiment, a method for writing a fiber Bragg grating includes:
1. Sample preparation the material of the sample is a single mode fiber, and the index matching liquid with the index of refraction of 1.47 is dripped on a glass slide and then fixed on a writing platform 9.
2. And (3) sample processing, namely irradiating femtosecond laser on a spatial light modulator 6, loading a cylindrical lens hologram of-1 DEG on the spatial light modulator 6, adjusting processing energy to 137uw, and setting the frequency to 100Hz by laser control software on a computer.
3. The stripped single-mode optical fiber is fixed on a inscription platform 9, an illumination light source 10 is turned on, the position of a cylindrical lens linear light field in the single-mode optical fiber is adjusted, the inscription platform 9 is controlled by a computer to move on a plane at the speed of 0.107mm/s, and the fiber Bragg grating with the processing length of 6mm is completed under the 60-time objective lens 8.
After processing is completed, the transmission spectrum of the grating can be obtained by a spectrometer and a broadband light source, as shown in fig. 5. The fiber Bragg grating has important application value in the field of fiber communication, and can be used as a wavelength division multiplexer, a gain flattening device of a fiber amplifier, a dispersion compensator, an all-optical network add-drop, a wavelength route, optical exchange and the like. Because the method of the case does not need to scan point by point, the processing can be completed only through linear light field exposure, and therefore, compared with the traditional method, the processing of the method is more flexible, efficient and rapid.
In another embodiment, a method of writing a fiber Bragg grating includes:
1. Sample preparation, wherein the material of the sample is single-mode fiber, and the index matching liquid with the index of refraction of 1.47 is dripped on a glass slide and then fixed on a motion platform.
2. And (3) sample processing, namely irradiating femtosecond laser on a spatial light modulator 6, loading a 9-degree cylindrical lens hologram on the spatial light modulator 6, adjusting processing energy to 137uw, and setting the frequency to 100Hz by laser control software on a computer.
3. The stripped single-mode optical fiber is fixed on a inscription platform 9, an illumination light source 10 is turned on, the position of a cylindrical lens linear light field in the single-mode optical fiber is adjusted, the inscription platform 9 is controlled by a computer to move on a plane at the speed of 0.107mm/s, and a 10-degree inclined fiber Bragg grating with the processing length of 6mm is finished under the 60-time objective lens 8.
After processing is completed, the transmission spectrum of the grating can be obtained by a spectrometer and a broadband light source, as shown in fig. 6. Inclined fiber Bragg gratings are widely applied to measurement of parameters such as bending, temperature, vibration, refractive index and the like in the field of optical fiber sensing. Meanwhile, the fiber bragg grating has important application value in the field of fiber communication, and the inclined fiber bragg grating can be used as a gain flattening device, a dispersion compensation device, an optical fiber filter, a wavelength division multiplexer and the like of an erbium-doped fiber amplifier. Because the method of the case does not need to scan point by point, the processing can be completed only through linear light field exposure, and therefore, compared with the traditional method, the processing of the method is more flexible, efficient and rapid.
It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to be limiting. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure in accordance with the embodiments provided herein.
It is to be understood that the drawings are merely illustrative of some embodiments of the present application and that it is possible for those skilled in the art to adapt the present application to other similar situations without the need for inventive work. In addition, it should be appreciated that while the development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as a departure from the disclosure.
Claims (10)
1. A system for inscribing a fiber bragg grating, the system comprising:
a femtosecond laser for emitting a femtosecond laser;
The spatial light modulator is used for modulating the femtosecond laser into a cylindrical lens linear light field;
And the inscription platform is used for receiving the cylindrical lens linear light field and providing inscription space of the fiber Bragg grating.
2. The fiber bragg grating inscription system of claim 1, wherein the spatial light modulator is a dynamic spatial light modulator.
3. The fiber bragg grating inscription system of claim 2, wherein the dynamic spatial light modulator is configured to modulate the femtosecond laser into a cylindrical lens line-shaped light field according to a cylindrical wave hologram.
4. The system for inscribing a fiber bragg grating according to claim 1, further comprising:
The energy regulation and control device is arranged at the output side of the femtosecond laser and is used for regulating and controlling the energy of the femtosecond laser;
The beam expander is used for expanding the femtosecond laser after energy regulation and control and transmitting the femtosecond laser after the beam expansion to the spatial light modulator;
the spatial light modulator is arranged on the output side of the beam expander.
5. The system of claim 4, wherein the energy modulation device comprises a half-wave plate and a polarizing beam splitter;
The half-wave plate is arranged on the output side of the femtosecond laser, and the polarized beam splitter is arranged on the output side of the half-wave plate.
6. The system for inscribing a fiber bragg grating according to claim 1, further comprising:
And the objective lens is used for focusing the cylindrical lens linear light field and transmitting the focused cylindrical lens linear light field to the inscription platform.
7. The system for writing a fiber Bragg grating according to claim 6, the writing system is characterized in that the writing system further comprises:
The illumination light source is arranged at one side of the writing platform;
The image detection device is used for detecting the cylindrical lens linear light field;
and the dichroic mirror is arranged on the output side of the spatial light modulator and is used for conducting the linear light field of the cylindrical lens to the objective lens and conducting the reflected light field of the inscription platform to the image detection device.
8. The system for inscribing a fiber bragg grating according to claim 1, further comprising:
And a computer electrically connected to the spatial light modulator for providing a cylindrical lens hologram to the spatial light modulator.
9. The system for writing a fiber Bragg grating according to claim 4, the writing system is characterized in that the writing system further comprises:
the reflecting mirror is arranged at the output side of the energy regulating device and is used for regulating the propagation path of the femtosecond laser after energy regulation;
the beam expander is arranged at the output side of the reflector.
10. The system for inscribing a fiber bragg grating according to claim 1, further comprising:
The energy regulation and control device is arranged at the output side of the femtosecond laser and is used for regulating and controlling the energy of the femtosecond laser;
the reflecting mirror is arranged at the output side of the energy regulating device and is used for regulating the propagation path of the femtosecond laser after energy regulation;
The beam expander is arranged at the output side of the reflector and is used for expanding the femtosecond laser after energy regulation and control and transmitting the femtosecond laser after the beam expansion to the spatial light modulator;
The spatial light modulator is arranged on the output side of the beam expander;
the objective lens is used for focusing the cylindrical lens linear light field and transmitting the focused cylindrical lens linear light field to the inscription platform;
The illumination light source is arranged at one side of the writing platform;
The image detection device is used for detecting the cylindrical lens linear light field;
and the dichroic mirror is arranged on the output side of the spatial light modulator and is used for conducting the linear light field of the cylindrical lens to the objective lens and conducting the reflected light field of the inscription platform to the image detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421197885.4U CN222259619U (en) | 2024-05-29 | 2024-05-29 | Optical fiber Bragg grating inscription system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202421197885.4U CN222259619U (en) | 2024-05-29 | 2024-05-29 | Optical fiber Bragg grating inscription system |
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