CN212033420U - Tunable pulse fiber laser - Google Patents
Tunable pulse fiber laser Download PDFInfo
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- CN212033420U CN212033420U CN202021045057.0U CN202021045057U CN212033420U CN 212033420 U CN212033420 U CN 212033420U CN 202021045057 U CN202021045057 U CN 202021045057U CN 212033420 U CN212033420 U CN 212033420U
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Abstract
The embodiment of the utility model discloses tunable pulse fiber laser. The tunable pulse fiber laser comprises: the device comprises a seed source module, a first-stage pre-amplification module, a second-stage pre-amplification module and an amplification module; the seed source module is used for outputting pulse type seed laser with adjustable central wavelength; the input end of the first-stage pre-amplification module is connected with the output end of the seed source module, and the first-stage pre-amplification module is used for amplifying seed laser; the input end of the second-stage pre-amplification module is connected with the output end of the first-stage pre-amplification module, and the first-stage pre-amplification module is used for amplifying the light output by the first-stage pre-amplification module; the input end of the amplification module is connected with the output end of the second-stage pre-amplification module, and the amplification module is used for amplifying the light output by the second-stage pre-amplification module. The embodiment of the utility model provides a technical scheme can export the high power pulsed laser of center wavelength adjustable, and simple structure, small, low price.
Description
Technical Field
The embodiment of the utility model provides a relate to laser technical field, especially relate to a tunable pulse fiber laser.
Background
With the research and development of laser technology, the types of lasers are increasing, wherein high-power pulse lasers have good application prospects in the material processing directions of laser welding, heat treatment, laser sintering and the like, and therefore, the high-power pulse lasers are widely researched by people in the past decades.
At present, most of high-power pulse lasers are solid lasers and disc lasers, but both the solid lasers and the disc lasers have the defects of complex structure, poor stability, large volume, difficult transportation, high price and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a tunable pulse fiber laser to realize the high power pulse laser of output center wavelength adjustable, and simplify the laser structure, reduce laser instrument volume, reduce cost.
In a first aspect, an embodiment of the present invention provides a tunable pulsed fiber laser, including: the device comprises a seed source module, a first-stage pre-amplification module, a second-stage pre-amplification module and an amplification module;
the seed source module is used for outputting pulse type seed laser with adjustable central wavelength;
the input end of the first-stage pre-amplification module is connected with the output end of the seed source module, and the first-stage pre-amplification module is used for amplifying the seed laser;
the input end of the second-stage pre-amplification module is connected with the output end of the first-stage pre-amplification module, and the first-stage pre-amplification module is used for amplifying the light output by the first-stage pre-amplification module;
the input end of the amplification module is connected with the output end of the second-stage pre-amplification module, and the amplification module is used for amplifying the light output by the second-stage pre-amplification module.
Optionally, the seed source module includes a continuous laser, a first isolator and a pulse modulator;
the input end of the first isolator is connected with the output end of the continuous laser, the output end of the first isolator is connected with the input end of the pulse modulator, and the output end of the pulse modulator is connected with the input end of the first-stage pre-amplification module.
Optionally, the continuous laser is a polarization-maintaining single-frequency laser.
Optionally, the pulse modulator comprises an acousto-optic modulator or an electro-optic modulator.
Optionally, the central wavelength of the laser light output by the continuous laser is 1535nm-1560 nm.
Optionally, the first-stage pre-amplification module includes a first pump source, a second pump source, a first wavelength division multiplexer, a second wavelength division multiplexer, a first gain fiber, and a second isolator;
the pump end of the first wavelength division multiplexer is connected with the output end of the first pump source, the signal end of the first wavelength division multiplexer is connected with the output end of the seed source module, and the output end of the first wavelength division multiplexer is connected with the first end of the first gain optical fiber;
the pump end of the second wavelength division multiplexer is connected with the output end of the second pump source, the signal end of the second wavelength division multiplexer is connected with the second end of the first gain optical fiber, and the output end of the second wavelength division multiplexer is connected with the input end of the second isolator;
and the output end of the second isolator is connected with the input end of the second-stage pre-amplification module.
Optionally, the first gain fiber is a polarization maintaining fiber; and the optical fiber in the first wavelength division multiplexer, the optical fiber in the second wavelength division multiplexer and the optical fiber in the second isolator are all polarization-maintaining optical fibers.
Optionally, the second-stage pre-amplification module includes a tunable filter, a first cladding pump stripper, a second gain fiber, a first beam combiner, a third isolator, and a third pump source; the amplifying module comprises a second cladding pump stripper, a third gain fiber, a second beam combiner and a fourth pump source;
the input end of the adjustable filter is connected with the output end of the first-stage pre-amplification module, the output end of the adjustable filter is connected with the input end of the first cladding pumping stripper, the output end of the first cladding pumping stripper is connected with the first end of the second gain optical fiber, the second end of the second gain optical fiber is connected with the signal end of the first beam combiner, the pumping end of the first beam combiner is connected with the third pumping source, and the output end of the first beam combiner is connected with the input end of the third isolator;
the input end of the second cladding pumping stripper is connected with the output end of the third isolator, the output end of the second cladding pumping stripper is connected with the first end of the third gain fiber, the second end of the third gain fiber is connected with the signal end of the second beam combiner, and the output end of the fourth pumping source is connected with the pumping source end of the second beam combiner.
Optionally, the fourth pump source comprises at least two pump lasers.
Optionally, the second gain fiber and the third gain fiber are both polarization maintaining fibers; the optical fiber in the tunable filter, the optical fiber in the first cladding pump stripper, the optical fiber in the first beam combiner, the optical fiber in the third isolator, the optical fiber in the second cladding pump stripper and the optical fiber in the second beam combiner are all polarization maintaining optical fibers.
The utility model provides a tunable pulse fiber laser, including seed source module, first order pre-amplification module, second level pre-amplification module and amplification module for laser stability is good, simple structure, with low costs. The seed source module can output pulse type seed laser with adjustable central wavelength, so that the central wavelength of laser output by the laser is adjustable, and a user can adjust the central wavelength of the output laser according to actual conditions. And the first-stage pre-amplification module, the second-stage pre-amplification module and the amplification module can realize multi-stage amplification on the seed laser so as to obtain higher output power. The problems of complex structure, poor stability and high price of the conventional high-power pulse laser are solved, and the effects of simplifying the structure of the laser, reducing the volume of the laser and reducing the cost are achieved.
Drawings
Fig. 1 is a schematic structural diagram of a tunable pulse fiber laser provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another tunable pulse fiber laser provided by an embodiment of the present invention;
fig. 3 is a spectrum diagram of a pulsed laser with a center wavelength of 1559.4nm provided by an embodiment of the present invention;
fig. 4 is a spectrum diagram of a pulsed laser with a center wavelength of 1549.4nm provided by an embodiment of the present invention;
fig. 5 is a spectrum diagram of a pulsed laser with a center wavelength of 1535.0nm provided by an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present invention are described in terms of the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Fig. 1 is a schematic structural diagram of a tunable pulse fiber laser provided by an embodiment of the present invention. Referring to fig. 1, the tunable pulse fiber laser includes: the system comprises a seed source module 10, a first-stage pre-amplification module 20, a second-stage pre-amplification module 30 and an amplification module 40; the seed source module 10 is used for outputting pulse type seed laser with adjustable central wavelength; the input end of the first-stage pre-amplification module 20 is connected with the output end of the seed source module 10, and the first-stage pre-amplification module 20 is used for amplifying seed laser; the input end of the second-stage pre-amplification module 30 is connected with the output end of the first-stage pre-amplification module 20, and the first-stage pre-amplification module 20 is used for amplifying the light output by the first-stage pre-amplification module 20; the input end of the amplifying module 40 is connected to the output end of the second-stage pre-amplifying module 30, and the amplifying module 40 is configured to amplify the light output by the second-stage pre-amplifying module 30.
Specifically, the seed source module 10 may include a pulse laser that can output a pulse laser with a tunable center wavelength, that is, the pulse laser directly outputs the seed laser. The seed source module 10 may further include a continuous laser capable of outputting a continuous laser with an adjustable center wavelength, and a pulse modulator capable of modulating the continuous laser into a pulse laser to obtain a seed laser. The adjustable range of the center wavelength of the seed laser, the adjustable range of the pulse width of the seed laser, and the adjustable range of the repetition frequency of the seed laser can be set by those skilled in the art according to actual situations, which is not limited in this application.
Specifically, the first-stage pre-amplification module 20 amplifies the seed laser, so that the power of the seed laser is improved, and the doped components in the spectrum are reduced. The second-stage pre-amplification module 30 amplifies the light output by the first-stage pre-amplification module 20, so that the power of the seed laser is further improved, and the doping component in the spectrum is further reduced. The amplifying module 40 amplifies the light output by the second stage pre-amplifying module 30, so that the finally output pulsed laser has higher power. In essence, the tunable pulse fiber laser amplifies the seed laser light by three stages, and thus can output a high-power pulse laser light.
It can be understood that a user can flexibly select the center wavelength, the pulse width and the repetition frequency of the seed laser output by the seed source module 10 according to actual conditions, so that the pulse laser finally output by the tunable pulse fiber laser meets the actual requirements of the user.
It can be understood that all the light in the tunable pulse fiber laser is transmitted in the optical fiber, so that the tunable pulse fiber laser is insensitive to changes of humidity, vibration and temperature, that is, the influence of environmental factors on the tunable pulse fiber laser is extremely small, and the generated light is not influenced by the thermal lens effect, so that the tunable pulse fiber laser has the advantage of good stability. Secondly, because the working substance is the gain fiber, compared with the large-volume gain crystal, the gain fiber has larger surface area and better heat dissipation performance, so that the transmission of the high-power laser does not need a complex water cooling system, and the tunable pulse fiber laser has the advantages of simple structure, small volume and convenient transportation. Finally, tunable pulsed fiber lasers have the advantage of low cost due to the relatively low manufacturing cost of the fiber and the price of the pump source.
The utility model provides a tunable pulse fiber laser, including seed source module 10, first order pre-amplification module 20, second level pre-amplification module 30 and amplification module 40 for laser stability is good, simple structure, with low costs. The seed source module 10 can output the pulse type seed laser with adjustable center wavelength, so that the center wavelength of the laser finally output by the laser can be adjusted, and a user can adjust the center wavelength of the output laser according to actual conditions. And the first-stage pre-amplification module 20, the second-stage pre-amplification module 30 and the amplification module 40 can realize multi-stage amplification on the seed laser so as to obtain higher output power. The problems of complex structure, poor stability and high price of the conventional high-power pulse laser are solved, and the effects of simplifying the structure of the laser, reducing the volume of the laser and reducing the cost are achieved.
Specifically, the seed source module 10, the first stage pre-amplification module 20, the second stage pre-amplification module 30, and the amplification module 40 may be implemented in various ways, and the following description is provided with reference to a typical example, but not intended to limit the present disclosure.
Fig. 2 is a schematic structural diagram of another tunable pulse fiber laser provided by an embodiment of the present invention. Referring to fig. 2, optionally, the seed source module 10 includes a continuous laser 11, a first isolator 12 and a pulse modulator 13; the input end of the first isolator 12 is connected with the output end of the continuous laser 11, the output end of the first isolator 12 is connected with the input end of the pulse modulator 13, and the output end of the pulse modulator 13 is connected with the input end of the first-stage pre-amplification module 20.
Optionally, the pulse modulator 13 comprises an acousto-optic modulator or an electro-optic modulator. As exemplarily shown in fig. 2, the pulse modulator 13 is an electro-optical modulator.
Optionally, the continuous laser 11 is a polarization maintaining single frequency laser. Optionally, the center wavelength of the laser light output by the continuous laser 11 ranges from 1535nm to 1560 nm. Optionally, the connecting optical fibers for connecting the devices in the seed source module 10 may also be polarization maintaining optical fibers. It can be understood that each device and the connecting fiber in the seed source module 10 have polarization maintaining characteristics, which can improve the polarization performance of the seed laser, and further improve the polarization extinction ratio.
With continued reference to fig. 2, optionally, the first stage pre-amplification module 20 includes a first pump source 21, a second pump source 22, a first wavelength division multiplexer 23, a second wavelength division multiplexer 24, a first gain fiber 25, and a second isolator 26. A pumping end 231 of the first wavelength division multiplexer 23 is connected with an output end of the first pumping source 21, a signal end 232 of the first wavelength division multiplexer 23 is connected with an output end of the seed source module 10, and an output end 233 of the first wavelength division multiplexer 23 is connected with a first end of the first gain fiber 25; the pumping end 241 of the second wavelength division multiplexer 24 is connected with the output end of the second pumping source 22, the signal end 242 of the second wavelength division multiplexer 24 is connected with the second end of the first gain fiber 25, and the output end 243 of the second wavelength division multiplexer 24 is connected with the input end of the second isolator 26; the output of the second isolator 26 is connected to the input of a second stage pre-amplification block 30.
Specifically, the first stage pre-amplification module 20 may employ forward pumping, backward pumping, bidirectional pumping, or other pumping means known to those skilled in the art. Preferably, as shown in fig. 2, the first-stage pre-amplification module 20 adopts a first pump source 21 and a second pump source 22 for bidirectional pumping, which is beneficial to improving the amplification factor of the first-stage pre-amplification module 20 on the seed laser and the signal-to-noise ratio.
Specifically, the center wavelength of the first pump light output by the first pump source 21 is the same as the center wavelength of the second pump light output by the second pump source 22. The power of the first pump light and the power of the second pump light may be the same or different, and is not limited herein.
Specifically, the first gain fiber 25 may be an erbium-doped fiber, an ytterbium-doped fiber, or other doped fibers known to those skilled in the art, and the present application is not limited thereto. Specifically, the first gain fiber 25 may be a single clad fiber. It is understood that the power of the first pump light and the second pump light is generally small, and the single clad fiber is used for transmitting the first pump light and the second pump light, which is beneficial to reducing the volume of the first gain fiber 25.
Optionally, the first gain fiber 25 is a polarization maintaining fiber; the optical fiber in the first wavelength division multiplexer 23, the optical fiber in the second wavelength division multiplexer 24, and the optical fiber in the second isolator 26 are all polarization maintaining optical fibers. Optionally, the connecting fibers for connecting the devices in the first pre-amplifying module 40 may also be all polarization maintaining fibers. It can be understood that each device and the connecting fiber in the first-stage pre-amplification module 20 have polarization maintaining characteristics, which can improve the polarization performance of the light output by the first pre-amplification module 40, and further improve the polarization extinction ratio.
Specifically, the working principle of the first stage pre-amplifying module 20 is as follows: the seed laser output by the seed source module 10 is coupled with the first pump light output by the first pump source 21 through a first wavelength division multiplexer 23, and the second pump light output by the second pump source 22 is coupled with the seed laser through a second wavelength division multiplexer 24. The seed laser is amplified by the first gain fiber 25 and then output to the second isolator 26 from the output end 243 of the second wavelength division multiplexer 24, and finally output from the output end of the second isolator 26, so that the first-stage pre-amplification module 20 completes the amplification process of the seed laser.
With continued reference to fig. 2, optionally, the second stage pre-amplification module 30 includes a tunable filter 31, a first cladding pump stripper 32, a second gain fiber 33, a first combiner 34, a third isolator 35, and a third pump source 36. The input end of the tunable filter 31 is connected to the output end of the first-stage pre-amplification module 20, the output end of the tunable filter 31 is connected to the input end of the first cladding pump stripper 32, the output end of the first cladding pump stripper 32 is connected to the first end of the second gain fiber 33, the second end of the second gain fiber 33 is connected to the signal end 343 of the first beam combiner 34, the pump end 341 of the first beam combiner 34 is connected to the third pump source 36, and the output end 342 of the first beam combiner 34 is connected to the input end of the third isolator 35.
Specifically, the second stage pre-amplification module 30 may employ forward pumping, backward pumping, bidirectional pumping, or other pumping means known to those skilled in the art. Preferably, as shown in fig. 2, the second-stage pre-amplification module 30 employs a reverse pump, and it is understood that the light input into the second-stage pre-amplification module 30 is the light of the seed laser after the first amplification, and the power of the light is already large enough, and the second-stage pre-amplification module 30 can output the light with larger power by using the reverse pump. In addition, the unidirectional pumping makes the second-stage pre-amplification module 30 simple in structure, and is beneficial to realizing the miniaturization of the tunable pulse fiber laser.
Specifically, the second gain fiber may be an erbium-doped fiber, an ytterbium-doped fiber, or other doped fibers known to those skilled in the art, and the present application is not limited thereto. In particular, the second gain fiber may be a double clad fiber. It is understood that the power of the third pump light output by the third pump source is generally large, and the double-clad fiber can ensure the effective transmission of the third pump light.
Optionally, the second gain fiber is a polarization maintaining fiber; the fiber in the tunable filter 31, the fiber in the first cladding pump stripper 32, the fiber in the first combiner 34, and the fiber in the third isolator 35 are all polarization maintaining fibers. Optionally, the connecting fibers for connecting the devices in the second pre-amplifying module 40 may also be all polarization maintaining fibers. It can be understood that each device and the connecting fiber in the second stage pre-amplifying module 30 have polarization maintaining characteristics, which can improve the polarization performance of the light output by the second pre-amplifying module 40, and further improve the polarization extinction ratio.
Specifically, the tunable filter 31 can suppress amplified spontaneous emission of the first-stage pre-amplification module 20, which is beneficial to improving the signal-to-noise ratio of light input into the second-stage pre-amplification module 30. The first cladding pump stripper 32 is capable of filtering out third pump light that is not absorbed by the second gain fiber 33. The second isolator 26 can prevent the second pump light from being input into the first-stage pre-amplification module 20.
Specifically, the working principle of the second stage pre-amplifying module 30 is as follows: light output by the first-stage pre-amplification module 20 passes through the tunable filter 31 and then enters the second gain fiber 33 through the first cladding pumping stripper 32, and meanwhile, third pumping light output by the third pumping source 36 is coupled with light output by the first-stage pre-amplification module 20 through the first beam combiner 34. The light output by the first-stage pre-amplification module 20 is amplified by the second gain fiber 33 and then output from the output end 342 of the first beam combiner 34, so that the second-stage pre-amplification module 30 completes the amplification process of the light output by the first-stage pre-amplification module 20.
With continued reference to fig. 2, the amplification module 40 optionally includes a second cladding pump stripper 41, a third gain fiber 43, a second combiner 43, and a fourth pump source. The input end of the second cladding pump stripper 41 is connected to the output end of the third isolator 35, the output end of the second cladding pump stripper 41 is connected to the first end of the third gain fiber 42, the second end of the third gain fiber 42 is connected to the signal end 432 of the second beam combiner 43, and the output end of the fourth pump source is connected to the pump source end of the second beam combiner 43.
Specifically, the amplification module 40 may employ forward pumping, backward pumping, bidirectional pumping, or other pumping means known to those skilled in the art. Preferably, the amplification module 40 employs counter-pumping, as shown in fig. 2.
Optionally, the fourth pump source comprises at least two pump lasers 441. Specifically, the fourth pump source may include at least two pump lasers 441, the pump source end of the second beam combiner 43 includes at least two sub pump source ends 431, and the output end of each pump laser 441 is connected to one sub pump source end 431. Therefore, the amplification capability of the amplification module 40 is improved, and the power of the pulse laser finally output by the amplification module 40 is improved. It should be noted that fig. 2 exemplarily shows that the fourth pump source includes two pump lasers 431, but the present application is not limited thereto, and a person skilled in the art can set the number of pump lasers 431 in the fourth pump source according to practical situations.
Specifically, the third gain fiber 42 may be an erbium-doped fiber, an ytterbium-doped fiber, or other doped fibers known to those skilled in the art, and the present application is not limited thereto. In particular, the third gain fiber 42 may be a double clad fiber. It is understood that the power of the fourth pump light output by the fourth pump source is generally large, and the double-clad fiber can ensure the effective transmission of the fourth pump light.
Optionally, the third gain fiber 42 is a polarization maintaining fiber; the optical fiber in the second cladding pump stripper 41 and the optical fiber in the second combiner 43 are both polarization maintaining fibers. Optionally, the connecting optical fibers for connecting the devices in the amplifying module 40 may also be all polarization maintaining optical fibers. It can be understood that each device and the connecting fiber in the amplifying module 40 have polarization maintaining characteristics, which can improve the polarization performance of the laser light finally output by the amplifying module 40, and further improve the polarization extinction ratio.
Specifically, the second cladding pump stripper 41 can filter out the fourth pump light that is not absorbed by the third gain fiber. The third isolator 35 can prevent the third pump light from being input into the second-stage pre-amplification module 30.
Optionally, water cooling is used at both the third gain fiber 42 and the second cladding pump stripper 43. It can be understood that the output power of the amplifying module 40 is higher, the temperature is higher, and the heat dissipation to the third gain fiber 42 and the second cladding pump stripper 43 can reduce the influence of the temperature on the pulse laser output by the amplifying module 40.
Optionally, the amplifying module 40 further includes a laser beam expanding output head, and the laser beam expanding output head is connected to the output end 433 of the second beam combiner 43. It can be understood that the laser beam expanding output head can further filter out the residual cladding pumping light, so as to improve the signal-to-noise ratio, and meanwhile, the laser beam expanding output head can also prevent the returned light from entering the amplifying module 40 to influence the amplification, so that the stability of the output power is ensured.
Specifically, the working principle of the amplifying module 40 is as follows: light output by the second-stage pre-amplification module 30 enters the third gain fiber 42 through the second cladding pump stripper 41, and meanwhile, fourth pump light output by the fourth pump source is coupled with light output by the second-stage pre-amplification module 30 through the second beam combiner 43. The light output by the second-stage pre-amplification module 30 is amplified by the third gain fiber 42 and then output from the output end 433 of the second beam combiner 43, so that the amplification module 40 completes the amplification process of the light output by the second-stage pre-amplification module 30.
Specifically, in the tunable pulse fiber laser, there are various types of design methods for each device, and a typical example will be described below, but the present application is not limited thereto.
In the seed source module, the continuous laser can be a polarization-maintaining single-frequency laser with the output power of 30mW, and the center wavelength of the continuous laser output by the continuous laser can be adjusted within the range of 1535nm-1560 nm. The continuous laser is modulated into pulse laser by an electro-optical modulator, the pulse width of the pulse laser is 5ns, the repetition frequency is 360kHz, and the average power after modulation is 16 uW. In the first-stage pre-amplification module, the first pumping source and the second pumping source both adopt semiconductor lasers with the maximum output power of 600mW and the central wavelength of 974nm, the specifications of the first wavelength division multiplexer and the second wavelength division multiplexer are both 980/1550nm, and the first gain optical fiber is a polarization-maintaining erbium-doped optical fiber with the length of 4.5 m. The output power of the first-stage pre-amplification module is 100mW through experiments. In the second-stage pre-amplification module, the adjustable wavelength range of the adjustable filter is 1535nm-1560nm, the single-wavelength bandwidth is 1nm, the loss is 3.58dB, and the highest bearing power is 5W/20 kW. The third pumping source adopts a semiconductor laser with the maximum output power of 20W and the central wavelength of 940 nm. The second gain fiber was an erbium doped fiber 3m long and model IXF-EY-12-130. The reason for adding the tunable filter is that the average power of the seed laser input into the first-stage pre-amplification module is small and only 16uW, and excessive spontaneous radiation is easily generated during amplification, which may cause that when the center wavelength is set to some wavelength (e.g., 1535nm), the side mode suppression after passing through the first-stage pre-amplification module is small, and subsequent amplification is difficult. After the tunable filter is added, the side mode suppression ratio under any central wavelength can be larger than 40dB through tests, and the enhancement of the amplification efficiency in the subsequent amplification process is facilitated. The output power of the second-stage pre-amplification module is 3W through experiments. In the amplifying module, a pump laser in a fourth pump source adopts a semiconductor laser with the maximum output power of 140W and the center wavelength of 915nm, and a third gain fiber is an erbium-doped fiber with the length of 4m and the model of PLMA-EYDF-25P/300. The output power of the amplifying module is 50W through experiments. And the third gain fiber and the second cladding pump stripper are cooled by water. The tunable pulse fiber laser is tested to obtain its output spectrum at several typical center wavelengths. Illustratively, fig. 3 is a spectrum diagram of a pulsed laser with a center wavelength of 1559.4nm provided by an embodiment of the present invention. Fig. 4 is a spectrum diagram of a pulsed laser with a center wavelength of 1549.4nm provided by an embodiment of the present invention. Fig. 5 is a spectrum diagram of a pulsed laser with a center wavelength of 1535.0nm provided by an embodiment of the present invention.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A tunable pulsed fiber laser, comprising: the device comprises a seed source module, a first-stage pre-amplification module, a second-stage pre-amplification module and an amplification module;
the seed source module is used for outputting pulse type seed laser with adjustable central wavelength;
the input end of the first-stage pre-amplification module is connected with the output end of the seed source module, and the first-stage pre-amplification module is used for amplifying the seed laser;
the input end of the second-stage pre-amplification module is connected with the output end of the first-stage pre-amplification module, and the first-stage pre-amplification module is used for amplifying the light output by the first-stage pre-amplification module;
the input end of the amplification module is connected with the output end of the second-stage pre-amplification module, and the amplification module is used for amplifying the light output by the second-stage pre-amplification module.
2. The tunable pulsed fiber laser of claim 1, wherein the seed source module comprises a continuous laser, a first isolator and a pulse modulator;
the input end of the first isolator is connected with the output end of the continuous laser, the output end of the first isolator is connected with the input end of the pulse modulator, and the output end of the pulse modulator is connected with the input end of the first-stage pre-amplification module.
3. The tunable pulsed fiber laser of claim 2, wherein the continuous laser is a polarization maintaining single frequency laser.
4. The tunable pulsed fiber laser of claim 2, wherein the pulse modulator comprises an acousto-optic modulator or an electro-optic modulator.
5. The tunable pulsed fiber laser of claim 2, wherein the center wavelength of the laser light output by the continuous laser is in the range 1535nm-1560 nm.
6. The tunable pulsed fiber laser of claim 1, wherein the first stage pre-amplification module comprises a first pump source, a second pump source, a first wavelength division multiplexer, a second wavelength division multiplexer, a first gain fiber, and a second isolator;
the pump end of the first wavelength division multiplexer is connected with the output end of the first pump source, the signal end of the first wavelength division multiplexer is connected with the output end of the seed source module, and the output end of the first wavelength division multiplexer is connected with the first end of the first gain optical fiber;
the pump end of the second wavelength division multiplexer is connected with the output end of the second pump source, the signal end of the second wavelength division multiplexer is connected with the second end of the first gain optical fiber, and the output end of the second wavelength division multiplexer is connected with the input end of the second isolator;
and the output end of the second isolator is connected with the input end of the second-stage pre-amplification module.
7. The tunable pulsed fiber laser of claim 6, wherein the first gain fiber is a polarization maintaining fiber; and the optical fiber in the first wavelength division multiplexer, the optical fiber in the second wavelength division multiplexer and the optical fiber in the second isolator are all polarization-maintaining optical fibers.
8. The tunable pulsed fiber laser of claim 1, wherein the second stage pre-amplification module comprises a tunable filter, a first cladding pump stripper, a second gain fiber, a first combiner, a third isolator, and a third pump source; the amplifying module comprises a second cladding pump stripper, a third gain fiber, a second beam combiner and a fourth pump source;
the input end of the adjustable filter is connected with the output end of the first-stage pre-amplification module, the output end of the adjustable filter is connected with the input end of the first cladding pumping stripper, the output end of the first cladding pumping stripper is connected with the first end of the second gain optical fiber, the second end of the second gain optical fiber is connected with the signal end of the first beam combiner, the pumping end of the first beam combiner is connected with the third pumping source, and the output end of the first beam combiner is connected with the input end of the third isolator;
the input end of the second cladding pumping stripper is connected with the output end of the third isolator, the output end of the second cladding pumping stripper is connected with the first end of the third gain fiber, the second end of the third gain fiber is connected with the signal end of the second beam combiner, and the output end of the fourth pumping source is connected with the pumping source end of the second beam combiner.
9. The tunable pulsed fiber laser of claim 8, wherein the fourth pump source comprises at least two pump lasers.
10. The tunable pulsed fiber laser of claim 8, wherein the second gain fiber and the third gain fiber are both polarization maintaining fibers; the optical fiber in the tunable filter, the optical fiber in the first cladding pump stripper, the optical fiber in the first beam combiner, the optical fiber in the third isolator, the optical fiber in the second cladding pump stripper and the optical fiber in the second beam combiner are all polarization maintaining optical fibers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114552362A (en) * | 2022-04-28 | 2022-05-27 | 武汉镭晟科技有限公司 | Laser for laser radar |
| CN115326714A (en) * | 2022-10-12 | 2022-11-11 | 南京泰爱信科技有限公司 | All-fiber laser structure and atmospheric gas spectrum measurement method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114552362A (en) * | 2022-04-28 | 2022-05-27 | 武汉镭晟科技有限公司 | Laser for laser radar |
| CN115326714A (en) * | 2022-10-12 | 2022-11-11 | 南京泰爱信科技有限公司 | All-fiber laser structure and atmospheric gas spectrum measurement method |
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