CN222089017U - An adjustable dual-mode laser - Google Patents
An adjustable dual-mode laser Download PDFInfo
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- CN222089017U CN222089017U CN202420728382.9U CN202420728382U CN222089017U CN 222089017 U CN222089017 U CN 222089017U CN 202420728382 U CN202420728382 U CN 202420728382U CN 222089017 U CN222089017 U CN 222089017U
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- 239000013307 optical fiber Substances 0.000 claims description 24
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- 229910052775 Thulium Inorganic materials 0.000 description 16
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 14
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- 230000010287 polarization Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
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- 230000004927 fusion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- -1 thulium ion Chemical class 0.000 description 2
- 102000000594 Growth Differentiation Factor 10 Human genes 0.000 description 1
- 108010041881 Growth Differentiation Factor 10 Proteins 0.000 description 1
- 101100456571 Mus musculus Med12 gene Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
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- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The utility model discloses an adjustable dual-mode laser which comprises a light source assembly, a grating assembly, at least one amplifier assembly, a modulation assembly and a control assembly, wherein the amplifier assembly comprises a first amplifier and a second amplifier, the modulation assembly comprises a first acousto-optic modulator and a second acousto-optic modulator, the control assembly comprises a control unit, a first driving sub-assembly and a second driving sub-assembly, pump light emitted by the light source assembly is incident to the grating assembly to generate signal light, the control assembly controls the modulation assembly to continuously transmit the signal light to the second amplifier in a continuous light mode, the control assembly controls the modulation assembly to transmit the signal light to the second amplifier in a pulse mode at a preset modulation frequency in a quasi-continuous light mode, and the second amplifier amplifies and outputs a continuous signal beam or a quasi-continuous signal beam emitted by the modulation assembly. The adjustable dual-mode laser provided by the utility model can realize dual-mode switching and obviously improve the output beam power.
Description
Technical Field
The utility model relates to the technical field of lasers, in particular to an adjustable dual-mode laser.
Background
The single longitudinal mode laser with the wave band of 2 mu m has important application in the fields of high resolution spectrum, atmospheric environment detection, laser radar, gravitational wave detection and the like, particularly has the wave band of 2.05 mu m, has low transmission loss in an atmospheric window, is very needed in the fields of remote sensing and communication, and can be used as pump light of an optical parametric oscillator (Optical Parametric Oscillator, OPO) to generate 3-5 mu m middle-far infrared laser. Compared with the MHz linewidth of a semiconductor single-frequency laser, the single-frequency fiber laser with narrow linewidth (kHz magnitude) has better coherence and obvious advantages. Particularly, a 2051nm single-frequency narrow-linewidth optical fiber laser with two working modes of Continuous light (CW) and long-period pulse (or Quasi-Continuous light) (QCW, the duty ratio is generally less than or equal to 50 percent, and the pulse width is less than or equal to 50 ms) can be realized, and the single-frequency narrow-linewidth optical fiber laser has wide application requirements in the fields of scientific research and industry.
The implementation modes of the 2 μm-band single-frequency fiber laser mainly include a distributed feedback (Distributed Feedback, DFB), a distributed Bragg reflection (Distributed Bragg Reflector, DBR), a ring cavity and the like. The DFB and DBR single-frequency lasers have stable single longitudinal mode operation, compact structure and wider application due to the length of the cavity. Because the thulium ion emission peak is around 1950nm, the wavelengths of the presently reported single frequency lasers are concentrated in the 1.9-2 μm band, and power outputs on the order of hundred W can be obtained by a master oscillator power amplifier (Master Oscillator Power Amplifier, MOPA) structure followed by a fiber amplifier. However, a single-frequency laser with a wavelength of 2051nm is difficult to obtain enough gain due to the fact that the single-frequency laser is positioned at the edge of the emission spectrum of thulium ions, and has still been reported recently. Although a DFB type laser is constructed by writing a phase shift grating on a single-mode thulium-doped fiber to realize stable single longitudinal mode operation at 2051nm, in order to obtain sufficient gain, the active fiber has a length of 80mm, the grating region has a length of 60mm, the packaging is difficult, the temperature control is complicated, a large frequency drift exists, and the output power is only a few mW. For the power boost of 2051nm single-frequency laser, although the space optical amplifier is used for obtaining hundred W-level power output, the problems of complex operation, easy environmental influence, large volume, difficult transportation and the like exist, and the strict all-fiber high-power amplifier has higher compactness and stability and higher practicability in many applications, but the use length is too long and the stimulated Brillouin scattering (Stimulated Brillouin Scattering, SBS) nonlinear effect and the like are not widely studied yet because of the excessively low gain in the common thulium-doped optical fiber.
Disclosure of utility model
The utility model provides an adjustable dual-mode laser, which is characterized in that in a continuous light mode, a control component controls a modulation component to continuously transmit signal light to a second amplifier, in a quasi-continuous light mode, the control component controls the modulation component to transmit the signal light to the second amplifier in a pulse mode at a preset modulation frequency, and the second amplifier amplifies and outputs continuous signal light beams or quasi-continuous signal light beams emitted by the modulation component. Therefore, the dual-mode random switching is realized, the output laser beam power is obviously improved, the structure is simple and flexible, the volume is small, and the dual-mode random switching device is suitable for the technical effects of various applications.
According to a first aspect of the present utility model, there is provided a tunable dual mode laser comprising a light source assembly, a grating assembly, at least one amplifier assembly comprising a first amplifier and a second amplifier, a modulation assembly comprising a first acousto-optic modulator and a second acousto-optic modulator, and a control assembly comprising a control unit, a first drive sub-assembly and a second drive sub-assembly;
The output end of the light source assembly is connected with the input end of the grating assembly, the output end of the grating assembly is connected with the input end of the first amplifier, the output end of the first amplifier is connected with the input end of the second amplifier, the first acousto-optic modulator and the second acousto-optic modulator are arranged between the first amplifier and the second amplifier, the control unit is connected with the first acousto-optic modulator through the first driving subassembly, and the control unit is connected with the second acousto-optic modulator through the second driving subassembly;
The pumping light emitted by the light source assembly is incident to the grating assembly to generate signal light;
The tunable dual-mode laser comprises a continuous light mode and a quasi-continuous light mode, wherein in the continuous light mode, the control component controls the modulation component to continuously transmit the signal light to the second amplifier;
And the second amplifier amplifies the continuous signal beam or the quasi-continuous signal beam emitted by the modulation component and outputs the amplified continuous signal beam or the quasi-continuous signal beam.
Optionally, the first amplifier and the second amplifier each comprise a thulium doped fiber amplifier.
Optionally, the first amplifier includes a first pump source, a first pump combiner, and a first double-clad thulium-doped fiber;
The output end of the first pump source is connected with the first input end of the first pump beam combiner, the output end of the grating component is connected with the second input end of the first pump beam combiner, and the output end of the first pump beam combiner is connected with the input end of the first double-cladding thulium-doped optical fiber.
Optionally, the second amplifier includes a second pump source, a second pump combiner, and a second double-clad thulium-doped fiber;
The output end of the second pump source is connected with the first input end of the second pump beam combiner, the output end of the modulation component is connected with the second input end of the second pump beam combiner, and the output end of the second pump beam combiner is connected with the input end of the second double-cladding thulium doped optical fiber.
Optionally, the input end of the second pumping source is connected with the output end of the control unit;
When the adjustable dual-mode laser is in a continuous light mode, the control unit controls the second pump source to output continuous pump light;
When the adjustable dual-mode laser is in a quasi-continuous optical mode, the control unit controls the second pump source to output quasi-continuous pump light.
Optionally, the thulium doped fiber amplifier further includes a pump stripper and an isolator;
the input end of the pump stripper is connected with the output end of the thulium-doped optical fiber in the thulium-doped optical fiber amplifier, and the output end of the pump stripper is connected with the input end of the isolator.
Optionally, the first pump source is a semiconductor laser with a wavelength of 793nm of 22W.
Optionally, the thulium-doped optical fiber in the thulium-doped optical fiber amplifier is a polarization-maintaining double-clad optical fiber.
Optionally, the grating assembly includes a distributed bragg feedback fiber grating having a wavelength of 2051 nm.
Optionally, the light source assembly includes a fiber laser of 1570nm wavelength.
The utility model discloses an adjustable dual-mode laser which comprises a light source assembly, a grating assembly, at least one amplifier assembly, a modulation assembly and a control assembly, wherein the amplifier assembly comprises a first amplifier and a second amplifier, the modulation assembly comprises a first acousto-optic modulator and a second acousto-optic modulator, the control assembly comprises a control unit, a first driving sub-assembly and a second driving sub-assembly, the output end of the light source assembly is connected with the input end of the grating assembly, the output end of the grating assembly is connected with the input end of the first amplifier, the output end of the first amplifier is connected with the input end of the second amplifier, the first acousto-optic modulator and the second acousto-optic modulator are arranged between the first amplifier and the second amplifier, the control unit is connected with the first acousto-optic modulator through the first driving sub-assembly, the control unit is connected with the second acousto-optic modulator through the second driving sub-assembly, the pumping light of the light source assembly is incident on the grating assembly to generate signal light, the adjustable dual-mode laser comprises a continuous light mode and a quasi-continuous light mode, the control assembly is used for controlling the modulation assembly to continuously transmit the signal light to the second amplifier, the signal light is continuously transmitted to the second amplifier, the signal light is continuously modulated by the second amplifier is continuously modulated by the control assembly, and the signal is continuously modulated by the second amplifier is modulated by the second amplifier. Therefore, the dual-mode random switching is realized, the output laser beam power is obviously improved, the structure is simple and flexible, the volume is small, and the dual-mode random switching device is suitable for the technical effects of various applications.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a tunable dual mode laser according to the present utility model;
FIG. 2 is a schematic diagram of the internal structure of a first amplifier in a tunable dual-mode laser according to the present utility model;
FIG. 3 is a schematic diagram of the internal structure of a second amplifier in a tunable dual-mode laser according to the present utility model;
FIG. 4 is a schematic diagram of another tunable dual mode laser according to the present utility model;
FIG. 5 is a schematic diagram of the operation of a control assembly in a tunable dual mode laser in a quasi-continuous optical mode according to the present utility model;
FIG. 6 is a graph of the output spectrum of a tunable dual mode laser provided by the present utility model;
fig. 7 is a diagram of a pulse waveform of a tunable dual mode laser according to the present utility model.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a tunable dual-mode laser provided by the present utility model, and referring to fig. 1, the tunable dual-mode laser provided by the present utility model includes a light source assembly 1, a grating assembly 2, at least one amplifier assembly 3, a modulation assembly 4, and a control assembly 5; the amplifier assembly 3 comprises a first amplifier 31 and a second amplifier 32, the modulation assembly 4 comprises a first acousto-optic modulator 41 and a second acousto-optic modulator 42, the control assembly 5 comprises a control unit 51, a first driving subassembly 52 and a second driving subassembly 53, the output end of the light source assembly 1 is connected with the input end of the grating assembly 2, the output end of the grating assembly 2 is connected with the input end of the first amplifier 31, the output end of the first amplifier 31 is connected with the input end of the second amplifier 32, the first acousto-optic modulator 41 and the second acousto-optic modulator 42 are arranged between the first amplifier 31 and the second amplifier 32, the control unit 51 is connected with the first acousto-optic modulator 41 through the first driving subassembly 53 and the second acousto-optic modulator 42, the control unit 51 is connected with the second driving subassembly 53, the pumping light emitted by the light source assembly 1 is incident on the grating assembly 2 to generate signal light, the adjustable dual-mode laser comprises a continuous light mode and a quasi-continuous light mode, the control assembly 5 controls the modulation assembly 4 to continuously transmit the signal light to the second amplifier 32, and the signal light is modulated by the quasi-continuous light mode 4 after the control assembly 5 controls the continuous light beam to continuously transmit the signal light to the second amplifier 32, and the signal is modulated by the second amplifier 4 to continuously modulate the signal light to the second amplifier 32 through the preset frequency.
Alternatively, the light source module 1 may be a 1570nm wavelength fiber laser.
Alternatively, the grating assembly 2 may be a distributed Bragg feedback fiber grating with a wavelength of 2051 nm. In particular, the grating assembly 2 may be formed by engraving a DFB grating with a central wavelength of 2051nm on a thulium doped fiber.
Alternatively, the pump source of the first amplifier 31 is a 22W 793nm wavelength semiconductor laser.
Optionally, the first amplifier 31 and the second amplifier 32 are thulium doped fiber amplifiers.
Specifically, the light source component 1 of the adjustable dual-mode laser provided by the embodiment of the utility model is used for emitting light with the wavelength of 1570nm, the grating component 2 is a distributed bragg feedback type fiber bragg grating with the wavelength of 2051nm, and the grating component 2 is a grating structure with specific wavelength and phase shift characteristics, so that the light source component 1 can stably operate with a single wavelength. The pumping source of the first amplifier 31 is a semiconductor laser with the wavelength of 793nm of 22W, the first amplifier 31 and the second amplifier 32 are all thulium doped optical fiber amplifiers, and the thulium doped optical fiber amplifiers are devices for amplifying optical signals with specific wavelengths by utilizing optical fibers doped with rare earth elements thulium (Tm), and are particularly used for improving the power of signal light. The first acoustic optical modulator 41 and the second acoustic optical modulator 42 are devices for controlling the intensity of a light beam such as a laser beam by utilizing an acousto-optic effect. As shown in fig. 1, the output end of the light source assembly 1 is connected with the input end of the grating assembly 2, the output end of the grating assembly 2 is connected with the input end of the first amplifier 31, the output end of the first amplifier 31 is connected with the input end of the second amplifier 32, the first acousto-optic modulator 41 and the second acousto-optic modulator 42 are located between the first amplifier 31 and the second amplifier 32, the control assembly comprises a control unit 51, a first driving subassembly 52 and a second driving subassembly 53, the control unit 51 controls the first acousto-optic modulator 41 through the first driving subassembly 52, the control unit 51 controls the second acousto-optic modulator 42 through the second driving subassembly 53, the pump light with the wavelength of 1570nm emitted by the light source assembly 1 is incident on the grating assembly 2 to generate signal light with the wavelength of 2051nm, the adjustable dual-mode laser comprises a continuous laser mode and a quasi-continuous laser mode, wherein the continuous laser mode refers to the laser can provide continuous laser beams until the laser beams are actively turned off, the quasi-continuous laser mode refers to a long-period pulse light mode, the continuous laser beam is combined with the peak output of the continuous laser and the high peak output power of the continuous laser can be added to a continuous peak power at the same time as a continuous peak power of the continuous laser can be added to a continuous peak power at a constant peak power, and a high average power of the continuous peak power can be ensured.
In the continuous light mode, the control unit 5 controls the modulation unit 4 to continuously transmit the signal light to the second amplifier 32;
In a quasi-continuous light mode, the control unit 5 controls the modulation unit 4 to transmit the signal light to the second amplifier 32 in a pulse manner at a preset modulation frequency (which may be 50kHz for example, which is not limited by the present utility model), in an exemplary specific adjustment process, in the continuous light mode, the control unit 51 may give the first driving subassembly 52 and the second driving subassembly 53 a low level, and then control the first acousto-optic modulator 41 and the second acousto-optic modulator 42 to modulate into the continuous light mode so as to generate a continuous signal beam, in the quasi-continuous light mode, the control unit 51 may give the first driving subassembly 52 and the second driving subassembly 53 a high level for a preset time and a low level for a preset time, and then control the first acousto-optic modulator 41 and the second acousto-optic modulator 42 to modulate into the quasi-continuous light mode so as to generate a quasi-continuous laser beam, and the second amplifier 32 amplifies the continuous signal beam or the quasi-continuous signal beam emitted from the modulation unit 4 and outputs the amplified continuous signal beam.
In the continuous light mode, the control component controls the modulation component to continuously transmit the signal light to the second amplifier so as to promote the power of the continuous signal light beam and emit the signal light, and in the quasi-continuous light mode, the control component controls the modulation component to transmit the signal light to the second amplifier in a pulse mode with a preset modulation frequency so as to promote the power of the quasi-continuous signal light beam and emit the signal light, so that the dual mode is switched arbitrarily and the power of the output laser light beam is promoted obviously.
Fig. 2 is a schematic diagram of the internal structure of a first amplifier in an adjustable dual-mode laser according to the present utility model, referring to fig. 1 and 2, optionally, the first amplifier 31 includes a first pump source 311, a first pump beam combiner 312, and a first double-clad thulium-doped fiber 313, where an output end of the first pump source 311 is connected to a first input end of the first pump beam combiner 312, an output end of the grating assembly 2 is connected to a second input end of the first pump beam combiner 312, and an output end of the first pump beam combiner 312 is connected to an input end of the first double-clad thulium-doped fiber 313.
Specifically, the primary function of the first pump source 311 is to pump the active particles from the ground state to a high energy level, so as to realize population inversion, and provide energy for the amplifier, the primary function of the first pump combiner 312 is to combine at least one pump beam into one fiber to output, so as to increase the pump power, the first double-cladding thulium-doped fiber 313 is a domestic double-cladding thulium-doped fiber manufactured by wuhan corporation, and has a model of TDF-10/130PM, a polarization maintaining property, a length of 5.5m, a core diameter and a numerical aperture of 10 μm and 0.14, and an absorption coefficient at 793nm of 3.2dB/m. The output end of the first pump source 311 is connected with the first input end of the first pump beam combiner 312, the output end of the grating assembly 2 is connected with the second input end of the first pump beam combiner 312, the signal light output by the grating assembly 2 is incident to the first pump beam combiner 312, the first pump source 311 provides energy, and the output end of the first pump beam combiner 312 is connected with the input end of the first double-cladding thulium-doped fiber 313.
Fig. 3 is a schematic diagram of the internal structure of a second amplifier in an adjustable dual-mode laser according to the present utility model, referring to fig. 1 and 3, optionally, the second amplifier 32 includes a second pump source 321, a second pump beam combiner 322 and a second dual-cladding thulium-doped fiber 323, where an output end of the second pump source 321 is connected to a first input end of the second pump beam combiner 322, an output end of the modulation component 4 is connected to a second input end of the second pump beam combiner 322, and an output end of the second pump beam combiner 322 is connected to an input end of the second dual-cladding thulium-doped fiber 323.
Specifically, the second double-clad thulium-doped optical fiber 323 is a domestic double-clad thulium-doped optical fiber manufactured by Wuhan corporation, and has a model of TDF-10/130PM and a polarization maintaining length of 15m. The output end of the second pump source 321 is connected with the first input end of the second pump beam combiner 322, the output end of the modulation component 4 is connected with the second input end of the second pump beam combiner 322, the signal light output by the modulation component 4 is incident to the second pump beam combiner 322, the second pump source 321 provides energy, and the output end of the second pump beam combiner 322 is connected with the input end of the second double-cladding thulium doped fiber 323.
Fig. 4 is a schematic structural diagram of another tunable dual-mode laser according to the present utility model, referring to fig. 4, optionally, an input end of the second pump source 321 is connected to an output end of the control unit 51, when the control unit 5 is in the continuous optical mode, the control unit 51 controls the second pump source 321 to output continuous pump light, and when the control unit 5 is in the quasi-continuous optical mode, the control unit 51 controls the second pump source to output quasi-continuous pump light.
Specifically, when the control component 5 is in the continuous light mode, the control unit 51 controls the second pump source 321 to output the continuous pump light, and when the control component 5 is in the quasi-continuous light mode, the control unit 51 controls the second pump source 321 to output the quasi-continuous pump light, so as to continuously provide the energy required by the second amplifier 32 when the second amplifier 32 works.
With continued reference to fig. 1, 2 and 3, the thulium doped fiber amplifier optionally further comprises a pump stripper 6 and an isolator 7, wherein an input end of the pump stripper 6 is connected to an output end of a thulium doped fiber (e.g. a first double-clad thulium doped fiber 313 as shown in fig. 2 or a second double-clad thulium doped fiber 323 as shown in fig. 3) in the thulium doped fiber amplifier, and an output end of the pump stripper 6 is connected to an input end of the isolator 7.
The pump stripper 6 is an important component in high power fiber lasers for removing the unabsorbed residual pump light in the fiber and the isolator 7 is used to ensure unidirectional signal transmission and to block reverse signals. Specifically, in the first amplifier 31, the pump stripper 6 is connected to the output end of the first double-clad thulium-doped fiber 313 (as shown in fig. 2), in the second amplifier 32, the pump stripper 6 is connected to the output end of the second double-clad thulium-doped fiber 323 (as shown in fig. 3), and the output end of the pump stripper 6 is connected to the input end of the isolator 7.
Alternatively, the pump stripper 6 is provided with an input and an output of GDF-10/130-PM fiber. The 2051nm signal light amplified by the grating component 2 is output by a fast axis cut-off isolator of a polarization-maintaining single mode fiber (PM 1950), and the insertion loss is 1.3dB. To avoid SBS effects, the pigtail length of each fiber device in the amplifier is shortened as much as possible. The polarization fidelity performance and the insertion loss of each fusion point are respectively optimized, the fusion loss of the tail end of the actually measured gain optical fiber and the matched optical fiber is about 0.15dB, and the insertion loss of the input and output optical fiber links to 2051nm signal light is about 0.7 and 1.05dB respectively.
Fig. 5 is a schematic diagram of an adjustable dual-mode laser in which the control component is in quasi-continuous mode, fig. 6 is an output spectrum of the adjustable dual-mode laser, and fig. 7 is a pulse waveform of the adjustable dual-mode laser.
Referring to fig. 1, 2 and 3, the structure principle of the tunable dual-mode laser provided by the present utility model is as follows:
The grating component 2 (2051 nm wavelength distributed bragg feedback fiber bragg grating) is pumped by the light source component 1 (1570 nm wavelength fiber laser), the output power is 3mW, the linewidth is 1.5kHz, the signal light is input into the first amplifier 31 through the first pump beam combiner 312, the first amplifier provides gain by the double-cladding thulium-doped fiber, the 22W semiconductor laser with the 793nm wavelength is used as a pumping source, the pumping stripper 6 is connected to filter residual pumping light, the amplified 2051nm single-frequency linear polarization laser power is about 130mW, then the amplified 2051nm single-frequency linear polarization laser power enters the first acousto-optic modulator 41 and the second acousto-optic modulator 42, the first acousto-optic modulator 41 is controlled by the first driving sub-component 52, the second acousto-optic modulator 42 is controlled by the second driving sub-component 53, the mode switching between continuous light (CW) and quasi-continuous light (QCW) is realized, the total insertion loss of the two acousto-optic modulators is about 6dB, and the second amplifier 32 is required to be used again for power lifting. The second amplifier is different from the first amplifier in that the input signal light has two modes (namely a continuous laser beam and a quasi-continuous laser beam) of CW and QCW, when the input signal light is CW, the second pump source 321 is also in a continuous light mode, and when the pump power is 18W, the output power of 2051nm single-frequency narrow-linewidth linear polarization laser can reach 2.1W, when the input signal is QCW, the pump light is switched to pulse pump, the time sequence control is completed by the second pump source 321 and the control unit 51 in a matched manner, the working mode is as shown in FIG. 5, and at the moment, the parameters of the repetition frequency, the pulse width and the like of the output pulse can be set by the upper computer software.
The output spectrum of the actual 2051nm single frequency narrow linewidth QCW/CW dual mode laser is shown in FIG. 6 and the pulse waveform is shown in FIG. 7.
The adjustable dual-mode laser provided by the embodiment of the utility model has the following advantages:
1. the two working modes can be switched at will, and the device is suitable for various applications.
2. The output power is significantly increased.
3. Simple and flexible structure and convenient manufacture.
4. The volume is small, and the carrying is possible.
The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (10)
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| CN202420728382.9U CN222089017U (en) | 2024-04-09 | 2024-04-09 | An adjustable dual-mode laser |
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