CN113922195A - A narrow linewidth single-frequency thulium-doped distributed feedback fiber laser and system - Google Patents
A narrow linewidth single-frequency thulium-doped distributed feedback fiber laser and system Download PDFInfo
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- CN113922195A CN113922195A CN202111161630.3A CN202111161630A CN113922195A CN 113922195 A CN113922195 A CN 113922195A CN 202111161630 A CN202111161630 A CN 202111161630A CN 113922195 A CN113922195 A CN 113922195A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
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Abstract
The invention relates to the technical field of optical signals, in particular to a narrow-linewidth single-frequency thulium-doped distributed feedback optical fiber laser and a system. The narrow-linewidth single-frequency thulium-doped distributed feedback optical fiber laser comprises a thulium-doped optical fiber, wherein a fiber Bragg grating with phase shift is preset, the thulium-doped optical fiber is used for receiving a pumping optical signal, the pumping optical signal is transmitted to the phase shift grating, and the phase shift grating forms laser oscillation based on the pumping optical signal and outputs a single-frequency laser signal; wavelength division multiplexer sets up on single-frequency laser signal output light path track, is used for receiving optical signal and output optical signal extremely the phase shift grating, perhaps, be used for receiving single-frequency laser signal, and follow the single-frequency is mixed thulium and is distributed optical fiber output single-frequency laser signal.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a narrow-linewidth single-frequency thulium-doped distributed feedback fiber laser and a system.
Background
The narrow-linewidth single-frequency laser has important application value in the fields of quantum optics, cold atom physics, high-power laser systems, laser radars, coherent communication and the like by virtue of the advantages of high single-frequency characteristic and spectral purity, narrow laser linewidth and the like. The research field of quantum optics and cold atoms has special requirements on output wavelength except for the requirement of the line width of single-frequency laser, the application can be realized only when the photon energy corresponding to the single-frequency laser wavelength just meets the energy level difference, and the required specific wavelength can be from 160nm extreme ultraviolet band to 6um far infrared band.
In the prior art, a solid laser, a semiconductor laser, a fiber laser and other types of lasers can be combined with different gain media and various nonlinear frequency conversion technologies to realize narrow-linewidth single-frequency laser output of different wavebands, wherein a single-frequency titanium sapphire laser as the most mature solid single-frequency laser can realize watt-level single-frequency laser output near 800nm, and further can expand the wavelength to an ultraviolet waveband by combining nonlinear frequency conversion, but the whole system of the laser is of a full-space optical path structure and has the problems of large volume, poor stability and easy environmental interference; the single-frequency semiconductor laser can realize single-frequency laser output of each waveband by flexibly designing PN junction intervals in a chip, has small volume and good stability, but has the defect of lower output power and can not meet application requirements under certain conditions; the single-frequency fiber laser generally adopts a structure of a single-frequency seed laser and a fiber amplifier, can realize high-power single-frequency laser output at 950-2200nm by selecting different gains, but has insufficient power, and can expand the wavelength to a full waveband by further combining a nonlinear frequency conversion technology. However, in the waveband of the thulium-doped fiber laser, namely 1700-2200nm, the prior art only adopts a single-frequency semiconductor seed laser and a fiber amplifier to output a single-frequency laser signal, but the linewidth of the output single-frequency laser is larger than 1MHz, which cannot meet the requirements in many applications.
Disclosure of Invention
To prior art's weak point, the application provides a narrow linewidth single-frequency thulium-doped distributed feedback fiber laser and system, aims at providing high power, the single-frequency laser signal that the linewidth is less than 1MHz, specifically:
on the one hand, this application provides a thulium distributed feedback fiber laser is mixed to narrow linewidth single-frequency, including mixing thulium optic fibre, wherein, still include:
the distributed feedback fiber Bragg grating is written on the thulium-doped fiber and is preset with phase shift to form a phase shift grating;
the pumping light source unit is used for forming the pumping light signal and inputting the pumping light signal into the phase-shift grating;
the thulium-doped optical fiber is used for receiving the pump light signal, the pump light signal is transmitted to the phase shift grating, and the phase shift grating forms laser oscillation based on the pump light signal and outputs a single-frequency laser signal.
Preferably, the narrow linewidth single-frequency thulium-doped distributed feedback fiber laser includes a single-frequency laser signal having a wavelength of 1700nm to 2200 nm.
Preferably, the narrow linewidth single-frequency thulium-doped distributed feedback fiber laser further includes,
a wavelength division multiplexer disposed on the single-frequency laser signal output optical path track for receiving the pumping optical signal and outputting the pumping optical signal to the phase-shift grating, or,
the single-frequency laser signal and the pump light signal are mixed to be received, and the two signals are separated into two paths of optical fibers.
Preferably, the narrow linewidth single-frequency thulium-doped distributed feedback fiber laser further includes,
an isolation unit, set up in on the single-frequency laser signal light path orbit, be used for receiving single-frequency laser signal, the output of isolation unit forms the output of narrow linewidth single-frequency thulium-doped distribution feedback fiber laser.
On the other hand, the present application further provides a high power single-frequency thulium-doped fiber laser system, wherein the narrow linewidth single-frequency thulium-doped distributed feedback fiber laser further comprises,
the optical fiber amplification module is connected with the output end of the narrow-linewidth single-frequency thulium-doped distribution feedback optical fiber laser, and the optical fiber amplification module is used for right single-frequency laser signals are amplified to form single-frequency laser amplification signals.
Preferably, the high-power single-frequency thulium-doped fiber laser system further includes,
and the nonlinear frequency conversion module is connected with the optical fiber amplification module and used for receiving the single-frequency laser amplification signal and carrying out nonlinear frequency conversion treatment on the single-frequency laser amplification signal to form single-frequency laser conversion amplification signal output.
Preferably, in the high-power single-frequency thulium-doped fiber laser system, the wavelength range of the single-frequency laser converted and amplified signal is 212.5nm to 1100 nm.
In another aspect, the present application provides a high power single frequency fiber laser system, which includes:
the first laser unit is formed by any one of the high-power single-frequency thulium-doped fiber laser systems or gain medium-based single-frequency fiber laser systems and is used for outputting a first single-frequency laser signal;
the second laser unit is formed by any one of the high-power single-frequency thulium-doped fiber laser systems or single-frequency fiber laser systems based on other gain media and is used for outputting a second single-frequency laser signal;
the optical fiber coupling unit is used for receiving the first single-frequency laser signal and/or the second single-frequency laser signal and forming a laser coupling signal according to the first single-frequency laser signal and/or the second single-frequency laser signal;
and the nonlinear frequency conversion unit is used for receiving the laser coupling signal and carrying out nonlinear conversion on the laser coupling signal to form a single-frequency laser conversion signal for output.
Preferably, the high-power single-frequency thulium-doped fiber laser system is provided, wherein the wavelength of the single-frequency laser conversion signal is not less than 55.5 nm.
Compared with the prior art, the beneficial effects of this application are:
the distributed feedback single-frequency fiber laser effectively utilizes the advantages of good single-frequency property of output laser, difficult mode hopping, narrow line width, tunable output wavelength and the like of the distributed feedback single-frequency fiber laser, and the advantages can still be maintained after power amplification and nonlinear frequency conversion. Due to the high power output capability of the thulium-doped optical fiber amplification module, the narrow linewidth single-frequency laser power after nonlinear frequency conversion can reach dozens of watts. The whole system is of an all-fiber structure except the nonlinear frequency conversion module, has the advantages of compact structure, high efficiency, difficulty in environmental interference and the like, can effectively resist the influence of external environment temperature and vibration, has excellent stability, can perform nonlinear frequency conversion in the waveguide, and has the best anti-interference capability and stability.
Drawings
Fig. 1 is a schematic structural diagram of a narrow-linewidth single-frequency thulium-doped distributed feedback fiber laser provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a narrow-linewidth single-frequency thulium-doped distributed feedback fiber laser according to an embodiment of the present disclosure;
fig. 3 is a grating transmission spectrogram of a narrow-linewidth single-frequency thulium-doped distributed feedback fiber laser provided in an embodiment of the present application;
fig. 4 is a grating transmission spectrogram of a narrow-linewidth single-frequency thulium-doped distributed feedback fiber laser provided in an embodiment of the present application;
fig. 5 is a grating transmission spectrogram of a narrow-linewidth single-frequency thulium-doped distributed feedback fiber laser provided in an embodiment of the present application;
fig. 6 is a structural diagram of a narrow-linewidth single-frequency high-power thulium-doped fiber laser system according to an embodiment of the present disclosure;
fig. 7 is a structural diagram of a narrow-linewidth single-frequency high-power fiber laser system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1, in one aspect, the present application provides a narrow linewidth single-frequency thulium-doped distributed feedback fiber laser, including:
the thulium-doped optical fiber 1 is provided with a phase shift grating 11 in advance, and is used for receiving a pump optical signal, and when the pump optical signal is transmitted to the phase shift grating, the phase shift grating forms laser oscillation based on the pump optical signal and outputs a single-frequency laser signal; wherein, the phase shift volume of phase shift grating is (2N + P) Π, and N is the integer that is not less than 0, and P is for being greater than 0 and being less than 2 arbitrary number, the phase shift grating can be located the optional position of single-frequency thulium-doped distribution optical fiber, the phase shift volume of grating can be arbitrary value. Further, the phase shift grating may be a fiber bragg grating.
And the pumping light source unit 3 is connected with the wavelength division multiplexer and used for forming a pumping signal.
And the wavelength division multiplexer 2 is arranged on the track of the single-frequency laser signal output optical path and is used for receiving the pumping light signal and outputting the pumping light signal to the phase shift grating. ,
the working principle of the technical scheme is as follows:
the thulium-doped gain fiber is formed by doping thulium ions on the gain fiber, and the thulium-doped gain fiber is provided with a grating with phase shift. Under the state of pump light irradiation, pump light signals are transmitted to the phase shift grating through the thulium-doped optical fiber, the phase shift grating establishes a laser resonant cavity and introduces preset phase shift to realize filtering, the light signals are converted into narrow-linewidth single-frequency laser output, and the narrow-linewidth single-frequency laser wavelength range is 1700-2200 nm.
Illustratively, when the phase shift amount of the phase shift grating is (2N + P) Π, and P is 0.5, the preset phase shift amount is (2N +0.5 Π), as shown in fig. 3, the transmission peak is located on the short-wave side of the middle of the grating reflection spectrum. When the value of N is 0 and the value of P is 1, the preset phase shift amount is (2N +1) pi, and as shown in fig. 4, the transmission peak is located in the middle of the grating reflection spectrum. When N is 0 and P is 1.5, the preset phase shift is (2N +1.5) Π, and as shown in fig. 5, the transmission peak is located on the short-wave side of the middle of the grating reflection spectrum. Wherein the depressions in fig. 3, 4, and 5 are grating reflection regions, and the 3dB bandwidth of the grating reflection spectrum is greater than or equal to 0.01 nm.
The narrow-linewidth single-frequency thulium-doped distributed feedback fiber laser has the characteristics of compact structure, strong environmental interference resistance, narrow output single-frequency laser line width, good frequency stability and the like, the wavelength can cover 1700-2200nm, and the output single-frequency laser line width is less than 1 MHz.
As a further preferred embodiment, the narrow linewidth single-frequency thulium-doped distributed feedback fiber laser further comprises,
including isolation unit 4, set up in on the single-frequency laser signal light path track, be used for receiving wavelength division multiplexer exports single-frequency laser signal, isolation unit's output forms the output of narrow linewidth single-frequency thulium-doped distribution feedback fiber laser.
The isolation unit is used for protecting the phase shift grating, the wavelength division multiplexer and the pump light source unit and preventing the phase shift grating, the wavelength division multiplexer and the pump light source unit from being damaged by light input reversely. The structure is in a reverse pumping state.
Example two
As shown in fig. 2, in one aspect, the present application provides a narrow linewidth single-frequency thulium-doped distributed feedback fiber laser, including:
the thulium-doped optical fiber 1 is provided with a phase shift grating 11.
And the wavelength division multiplexer 2 is used for receiving the mixed signal of the single-frequency laser signal and the pump light signal and dividing the two light signals into two paths of different optical fibers.
And the pumping light source unit 3 is connected with the thulium-doped optical fiber and used for forming a pumping light signal which is input into the phase-shift grating.
As a further preferred embodiment, the narrow linewidth single-frequency thulium-doped distributed feedback fiber laser further comprises,
The isolation unit is used for protecting the phase shift grating, the wavelength division multiplexer and the pump light source unit and preventing the phase shift grating, the wavelength division multiplexer and the pump light source unit from being damaged by light input reversely.
The structure is in a forward pumping state.
EXAMPLE III
In yet another aspect, as shown in fig. 6, a high power single-frequency thulium doped fiber laser system includes any of the above narrow linewidth single-frequency thulium doped distributed feedback fiber laser, and further includes,
the optical fiber amplification module 21 is connected with the output end of the narrow linewidth single-frequency thulium-doped distribution feedback optical fiber laser 20, and the optical fiber amplification module is used for right single-frequency laser signals are amplified to form single-frequency laser amplification signals.
Further, the high-power single-frequency thulium-doped fiber laser system further comprises,
and the nonlinear frequency conversion module 22 is connected with the optical fiber amplification module 21 and used for receiving the single-frequency laser amplification signal and carrying out nonlinear frequency conversion processing on the single-frequency laser amplification signal to form a single-frequency laser conversion amplification signal output. Wherein the wavelength range of the single-frequency laser conversion amplification signal is 212.5 nm-1100 nm.
The frequency conversion mode of the nonlinear frequency conversion module can be frequency doubling, frequency tripling, frequency quadrupling, frequency quintupling, frequency octapling and the like, and aims to convert the wavelength range of the single-frequency laser amplification signal from 1700-2200nm to 212.5-1100nm, and the output power can reach tens of watts.
Example four
As shown in fig. 7, finally, the present application further provides a high power single frequency fiber laser system, which includes:
a first laser unit 30 for outputting a first single-frequency laser signal; the first laser unit comprises a narrow-linewidth single-frequency thulium-doped distribution feedback fiber laser and an optical fiber amplification module connected with the output end of the narrow-linewidth single-frequency thulium-doped distribution feedback fiber laser. The first single-frequency laser signal is a high-power single-frequency laser signal.
A second laser unit 31 for outputting a second single-frequency laser signal; the second laser unit comprises a narrow-linewidth single-frequency thulium-doped distribution feedback fiber laser and an optical fiber amplification module connected with the output end of the narrow-linewidth single-frequency thulium-doped distribution feedback fiber laser, or a high-power single-frequency fiber laser system based on other gain media. The second single-frequency laser signal is a high-power single-frequency laser signal, and the power or wavelength of the first single-frequency laser signal is different from the power and/or wavelength of the second single-frequency laser signal.
The optical fiber coupling unit 32 is configured to receive the first single-frequency laser signal and the second single-frequency laser signal, and form a laser coupling signal according to the first single-frequency laser signal and the second single-frequency laser signal; the first single-frequency laser signal and the second single-frequency laser signal are coupled to the same path of optical fiber and then enter nonlinear frequency conversion, and the optical fiber coupling unit is an optical fiber coupler for optical fiber input and output; when at least one of the first laser unit and the second laser unit is a spatial light output, the first single-frequency laser signal and/or the second single-frequency laser signal may be coupled to the same optical path by the optical fiber coupling unit and then enter the nonlinear frequency conversion, and schematically, the optical fiber coupling unit may be a coupler for spatial light input and output.
The nonlinear frequency conversion unit 33 is configured to receive the laser coupling signal, and perform nonlinear conversion on the laser coupling signal to form a single-frequency laser conversion signal for output. The transformation mode of the nonlinear frequency transformation unit can be sum frequency, difference frequency, frequency multiplication after sum frequency and the like. Furthermore, the wavelength of the single-frequency laser conversion signal is not less than 55.5nm, and the maximum output power can reach tens of watts.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
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| CN202111161630.3A CN113922195A (en) | 2021-09-30 | 2021-09-30 | A narrow linewidth single-frequency thulium-doped distributed feedback fiber laser and system |
| PCT/CN2022/076626 WO2023050685A1 (en) | 2021-09-30 | 2022-02-17 | Narrow-linewidth single-frequency thulium-doped distributed feedback optical fiber laser device, and system |
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Cited By (3)
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| CN114927923A (en) * | 2022-04-18 | 2022-08-19 | 中国电子科技集团公司第十一研究所 | Ultra-narrow linewidth fiber laser and system |
| WO2023050685A1 (en) * | 2021-09-30 | 2023-04-06 | 上海频准激光科技有限公司 | Narrow-linewidth single-frequency thulium-doped distributed feedback optical fiber laser device, and system |
| CN117712817A (en) * | 2023-12-14 | 2024-03-15 | 上海频准激光科技有限公司 | Single frequency laser system and laser interferometer containing the same |
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