CN220381286U - Laser emission system of MOPA structure for laser radar - Google Patents
Laser emission system of MOPA structure for laser radar Download PDFInfo
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- CN220381286U CN220381286U CN202321977093.4U CN202321977093U CN220381286U CN 220381286 U CN220381286 U CN 220381286U CN 202321977093 U CN202321977093 U CN 202321977093U CN 220381286 U CN220381286 U CN 220381286U
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- 230000008878 coupling Effects 0.000 claims abstract description 47
- 238000010168 coupling process Methods 0.000 claims abstract description 47
- 238000005859 coupling reaction Methods 0.000 claims abstract description 47
- 239000013307 optical fiber Substances 0.000 claims abstract description 37
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 10
- 238000003491 array Methods 0.000 claims abstract description 6
- 230000003321 amplification Effects 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 238000004806 packaging method and process Methods 0.000 description 1
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- 230000008646 thermal stress Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a laser emission system of MOPA structure for laser radar, comprising a seed source laser emission device, a gain fiber and isolator, a pump source laser emission device and a beam combiner; the seed source laser emission device for emitting the signal light comprises a seed source array, a seed source array beam collimation device and a seed source array beam coupling device; the pumping source laser emission device comprises a pumping source array, a pumping source array beam collimation device and a pumping source array beam coupling device which are sequentially connected through optical paths; the seed source array and the pump source array comprise VCSEL arrays; the seed source and pump source array beam coupling device focuses and couples the array beam into the optical fiber; the beam combiner is used for coupling pump light into the gain optical fiber; the gain fiber is used for absorbing the pump light and amplifying the signal light; the isolator is used for outputting and amplifying unidirectionally and isolating signal light transmitted in the backward direction. The utility model has small volume, good beam quality and high reliability.
Description
Technical Field
The utility model relates to the field of laser radars, in particular to a laser emission system of a MOPA structure for a laser radar.
Background
Currently, in laser radar applications, a MOPA light source with a wavelength of 1.5um is one of the popular light sources of the laser radar, a modulated side-emitting semiconductor laser with a wavelength of 1.5um is generally used as a seed source, and a continuously operating side-emitting semiconductor laser with a wavelength of 9XXnm is used as a pumping source of an optical fiber amplifier, so that the signal light of the seed source is amplified to obtain the required laser radar light source. The laser radar light source needs to work normally at an ambient temperature of-40 to 105 ℃. Since the characteristic of the edge-emitting semiconductor laser is that the wavelength changes along with the temperature change, the wavelength can reach 0.3 nm/DEG C generally, the output wavelength can be shortened in low-temperature operation, the output wavelength can be lengthened in high-temperature operation, the detection performance of the laser radar can be seriously affected by the severe change of the seed source wavelength, and the power consumption of the laser radar light source can be affected by the severe change of the pump source wavelength. Therefore, when the low-temperature end and the high-temperature end work, in order to ensure that the laser radar light source works normally, the seed source and the pumping source are usually required to be subjected to temperature control, so that the output wavelength of the seed source is ensured to be consistent within the range of-40 to 105 degrees, and the pumping efficiency of the pumping source is ensured. Meanwhile, the continuously working side-emitting semiconductor laser is used as a pumping source of the optical fiber amplifier, so that the problem of large heating value of the pumping source can be caused. Temperature control of the seed source and the pump source can lead to increased power consumption of the laser radar, and the cost of the laser radar light source can be high.
Disclosure of Invention
The utility model provides a laser emission system of MOPA structure for laser radar to solve the technical problems in the prior art.
The utility model adopts the technical proposal for solving the technical problems in the prior art that:
a laser emission system of MOPA structure for laser radar, the system includes seed source laser emission device, laser amplifying device and isolating device that the light path connects sequentially; the laser beam combining device is used for combining the laser beam emitted by the pump source; the seed source laser emission device is used for emitting signal light and comprises a seed source array, a seed source array beam collimation device and a seed source array beam coupling device which are sequentially connected through optical paths; the pumping source laser emission device comprises a pumping source array, a pumping source array beam collimation device and a pumping source array beam coupling device which are sequentially connected through optical paths; the seed source array and the pump source array comprise VCSEL arrays; the seed source array beam collimation device and the pump source array beam collimation device are used for collimating corresponding array beams; the seed source array beam coupling device and the pump source array beam coupling device are used for focusing and coupling corresponding array beams into the optical fiber; the beam combining device comprises a beam combiner, the laser amplifying device comprises a gain optical fiber, and the isolating device comprises an isolator; the beam combiner is used for coupling pump light into the gain optical fiber; the gain fiber is used for absorbing the pump light and amplifying the signal light; the isolator is used for outputting amplified signal light in one direction and isolating light transmitted in the backward direction.
Further, the pump source laser emission device comprises a forward pump source laser emission device and/or a reverse pump source laser emission device; the forward pumping source laser emission device and the seed source laser emission device are positioned on the same side of the laser amplification device; the reverse pumping source laser emission device and the seed source laser emission device are respectively positioned at two sides of the laser amplification device.
Further, the seed source array beam collimation device and the pump source array beam collimation device comprise micro lens arrays; the microlens array corresponds to the VCSEL array one by one.
Further, the microlenses in the microlens array are spherical or aspherical or cylindrical.
Further, the seed source array beam coupling device and the pump source array beam coupling device all comprise coupling lenses.
Further, the wavelength of the signal light emitted by the seed source is 1.5um.
Further, the wavelength of the pumping light emitted by the pumping source is 900 nm-1000 nm.
Further, a gain optical fiber, a pumping source laser emission device and a beam combiner form a primary amplifier; the system is provided with a plurality of stages of amplifiers which are cascaded in turn.
The utility model has the advantages and positive effects that: according to the laser emission system of the MOPA structure for the laser radar, disclosed by the utility model, the MOPA working in a quasi-continuous mode is adopted, so that the peak power of a pumping source can be improved, the heating value of the pumping source can be reduced, and the power consumption of the MOPA can be reduced. The VCSEL array is used as a seed source, the modulation performance of the VCSEL array is better than that of the side-emitting semiconductor laser, and the optical power of an output signal of the VCSEL array is higher, so that the power required by the laser radar can be realized by single-stage amplification. VCSEL arrays are used as pump sources because the divergence angle of the pump light emitted by the emission aperture of an individual VCSEL is smaller than that of an edge-emitting semiconductor laser, and the beam quality is better, so that the coupling efficiency into the optical fiber is higher. The VCSEL wavelength drift performance is better than that of an edge-emitting semiconductor laser, the seed source can meet the use requirement without temperature control, and the MOPA cost is reduced. Even if the emission aperture failure of a single VCSEL has little effect on the performance of the entire VCSEL after long operation, the MOPA of the VCSEL has higher reliability than the MOPA of the side emission.
Drawings
Fig. 1 is a schematic diagram of a MOPA structure laser emission system for a laser radar according to the present utility model, in which a forward pumping light path structure is adopted.
Fig. 2 is a schematic diagram of a MOPA structure laser emission system for a laser radar according to the present utility model, which uses a reverse pump optical path structure.
Fig. 3 is a schematic diagram of a MOPA structure laser emission system for a laser radar according to the present utility model, which uses a bi-directional pump light path structure.
In the figure: 1. a seed source array; 2. a seed source array beam collimation device; 3. a seed source array beam coupling device; 4. a pump source array; 5. a pump source array beam collimation device; 6. a pump source array beam coupling device; 7. a beam combiner; 8. a gain fiber; 9. the isolator, A, forward pumping source laser emission device; B. and a reverse pumping source laser emitting device.
Detailed Description
The present utility model will be described in detail below with reference to the drawings in conjunction with the embodiments, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only and are not intended to limit the present utility model.
In the description of the present utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, only for convenience in describing the present utility model, and do not require that the present utility model must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
Referring to fig. 1 to 3, a laser emission system of MOPA structure for a laser radar includes a seed source laser emission device, a laser amplifying device and an isolation device connected in sequence by an optical path; the laser beam combining device is used for combining the laser beam emitted by the pump source; the seed source laser emission device is used for emitting signal light and comprises a seed source array 1, a seed source array beam collimation device 2 and a seed source array beam coupling device 3 which are sequentially connected through light paths; the pumping source laser emission device comprises a pumping source array 4, a pumping source array beam collimation device 5 and a pumping source array beam coupling device 6 which are sequentially connected through optical paths; the seed source array 1 and the pump source array 4 comprise VCSEL arrays; the seed source array beam collimation device 2 is used for collimating seed source array beams; the pump source array beam collimation device 5 is used for collimating pump source array beams; the seed source array light beam coupling device 3 is used for focusing and coupling the seed source array light beam into the optical fiber; the pump source array beam coupling device 6 is used for focusing and coupling the pump source array beam into the optical fiber; the beam combining device comprises a beam combiner 7, the laser amplifying device comprises a gain optical fiber 8, and the isolating device comprises an isolator 9; the combiner 7 is used for coupling pump light into the gain fiber 8; the gain fiber 8 is used for absorbing the pump light and amplifying the signal light; the isolator 9 is for outputting the amplified signal light unidirectionally and isolating the light transmitted backward.
The MOPA structured laser emission system refers to a nanosecond pulse fiber laser emission system based on an electrically modulated seed source and a multistage power amplifier, and is mainly used in the application fields of laser marking, precise cutting, welding, drilling and the like. Physically MOPA is a laser configuration, referred to as Main Oscillator and Power Amplifier for english and as master oscillator plus power amplifier for chinese, as opposed to a single oscillator configuration.
The VCSEL array is a surface emitting semiconductor light source that emits a laser beam in a direction perpendicular to its top surface. The emitting aperture of each VCSEL is very small, the diameter is about ten micrometers, the VCSEL array is arranged into a two-dimensional array, and the VCSEL array is formed by combining and packaging a plurality of VCSEL chips and can be used as a basic device for stabilizing a high-power pumping source; the VCSEL pump light array is more reliable, has long service life, narrow bandwidth and low thermal stress, and can be better suitable for high-temperature operation.
Preferably, the pump source laser emitting device may comprise a forward pump source laser emitting device a and/or a reverse pump source laser emitting device B; the forward pumping source laser emission device A and the seed source laser emission device are positioned on the same side of the laser amplification device; the reverse pumping source laser emitting device B and the seed source laser emitting device are respectively positioned at two sides of the laser amplifying device.
Preferably, the seed source array beam collimation device 2 and the pump source array beam collimation device 5 can comprise a micro lens array; the microlens array corresponds to the VCSEL array one by one. I.e. the mth row and the nth column of the microlens array corresponds to the mth row and the nth column of the VCSEL array.
Preferably, the microlenses in the microlens array may be spherical or aspherical or cylindrical.
Preferably, both the seed source array beam coupling means 3 and the pump source array beam coupling means 6 may comprise coupling lenses.
Preferably, the seed source emits a signal having a wavelength of 1.5um.
Preferably, the wavelength of the pump light emitted by the pump source can be 900nm to 1000nm.
Preferably, a gain optical fiber 8, a pumping source laser emitting device and a beam combiner 7 can form a primary amplifier; the system may be provided with multiple stages of amplifiers that are cascaded in sequence.
The utility model also provides a laser emission method of the MOPA structure for the laser radar by utilizing the laser emission system of the MOPA structure for the laser radar, the quasi-continuous pump light emitted by the pump source array 4 is collimated by the pump source array beam collimator 5, then is focused by the pump source array beam coupler 6 and is coupled into the pump signal end optical fiber of the beam combiner 7, the seed source array 1 works in a pulse state, and the emitted pulse signal light is collimated by the seed source array beam collimator 2, and then is focused by the seed source array beam coupler 3 and is coupled into the gain optical fiber 8; the quasi-continuous pump light is coupled into the gain fiber 8 by the beam combiner 7, the quasi-continuous pump light is absorbed by the gain fiber 8, the gain fiber 8 is in a particle number inversion state, the pulse signal light is amplified in the gain fiber 8, and finally, the pulse signal light is output after passing through the isolator 9.
Preferably, the repetition frequency of the pump light emitted by the quasi-continuously operating pump source array 4 may be less than or equal to the repetition frequency of the signal light emitted by the seed source array 1.
The construction and operation of the present utility model will be further described with reference to several preferred embodiments thereof:
example 1:
as shown in fig. 1, the structure of the forward pump source laser emission device a is adopted, and specifically includes a seed source array 1, a seed source array beam collimation device 2, a seed source array beam coupling device 3, a pump source array 4, a pump source array beam collimation device 5, a pump source array beam coupling device 6, a beam combiner 7, a gain fiber 8 and an isolator 9. The seed source array 1 comprises a VCSEL array, the wavelength of pulse signal light emitted by the VCSEL array is 1535nm, the pulse signal light array emitted by each emission hole is respectively collimated by the seed source array light beam collimation device 2 and then is focused and coupled into the gain optical fiber 8 by the seed source array light beam coupling device 3, the pump source array 4 comprises a VCSEL array, the wavelength of quasi-continuous pump light emitted by the VCSEL array light beam collimation device 5 is 976nm, the quasi-continuous pump light emitted by each emission hole is respectively collimated by the pump source array light beam collimation device 5 and then is focused and coupled into the pump signal end optical fiber of the beam combiner 7, the quasi-continuous pump light is coupled into the gain optical fiber 8 by the beam combiner 7, the quasi-continuous pump light is absorbed by the gain optical fiber 8, the gain optical fiber 8 is in a particle number inversion state, the pulse signal light is amplified in the gain optical fiber 8 and finally is output after passing through the isolator 9.
Example 2
As shown in fig. 2, the structure of the reverse pump source laser emitting device B is adopted, and specifically includes a seed source array 1, a seed source array beam collimation device 2, a seed source array beam coupling device 3, a pump source array 4, a pump source array beam collimation device 5, a pump source array beam coupling device 6, a beam combiner 7, a gain fiber 8 and an isolator 9. The seed source array 1 comprises a VCSEL array, the wavelength of pulse signal light emitted by the VCSEL array is 1535nm, the pulse signal light array emitted by each emission hole is respectively collimated by the seed source array light beam collimation device 2 and then is focused and coupled into the gain optical fiber 8 by the seed source array light beam coupling device 3, the pump source array 4 comprises a VCSEL array, the wavelength of quasi-continuous pump light emitted by the VCSEL array light beam collimation device 5 is 976nm, the quasi-continuous pump light emitted by each emission hole is respectively collimated by the pump source array light beam collimation device 5 and then is focused and coupled into the pump signal end optical fiber of the beam combiner 7, the quasi-continuous pump light is coupled into the gain optical fiber 8 by the beam combiner 7, the quasi-continuous pump light is absorbed by the gain optical fiber 8, the gain optical fiber 8 is in a particle number inversion state, the pulse signal light is amplified in the gain optical fiber 8 and finally is output after passing through the isolator 9.
Example 3
As shown in fig. 3, a structure of bidirectional pumping is adopted, namely a forward pumping source laser emitting device A and a backward pumping source laser emitting device B are adopted, and the device specifically comprises a seed source array 1, a seed source array beam collimation device 2, a seed source array beam coupling device 3, a forward pumping source laser emitting device A, a backward pumping source laser emitting device B, a gain fiber 8 and an isolator 9; the forward pump source laser emission device A and the backward pump source laser emission device B comprise a pump source array 4, a pump source array beam collimation device 5 and a pump source array beam coupling device 6; the corresponding forward pumping source laser emission device A and the corresponding reverse pumping source laser emission device B are respectively and correspondingly connected with a beam combiner 7;
the seed source array 1 comprises a VCSEL array, the wavelength of pulse signal light emitted by the VCSEL array is 1535nm, the pulse signal light array emitted by each emission hole is respectively collimated by the seed source array light beam collimation device 2 and then is focused and coupled into the gain optical fiber 8 by the seed source array light beam coupling device 3, the pump source array 4 comprises a VCSEL array, the wavelength of quasi-continuous pump light emitted by the VCSEL array light beam collimation device 5 is 976nm, the quasi-continuous pump light emitted by each emission hole is respectively collimated by the pump source array light beam collimation device 5 and then is focused and coupled into the pump signal end optical fiber of the beam combiner 7, the quasi-continuous pump light is coupled into the gain optical fiber 8 by the beam combiner 7, the quasi-continuous pump light is absorbed by the gain optical fiber 8, the gain optical fiber 8 is in a particle number inversion state, the pulse signal light is amplified in the gain optical fiber 8 and finally is output after passing through the isolator 9.
The seed source laser emission device, the laser amplification device, the isolation device, the pumping source laser emission device, the beam combining device, the micro lens array, the coupling lens, the seed source array, the VCSEL array, the seed source array beam collimation device, the seed source array beam coupling device, the pumping source array beam collimation device, the pumping source array beam coupling device, the beam combining device, the gain optical fiber, the isolator, the forward pumping source laser emission device, the reverse pumping source laser emission device and other components and devices can be all applicable components and devices in the prior art, or applicable components and devices in the prior art are adopted, and conventional technical means are adopted for construction.
The above-described embodiments are only for illustrating the technical spirit and features of the present utility model, and it is intended to enable those skilled in the art to understand the content of the present utility model and to implement it accordingly, and the scope of the present utility model is not limited to the embodiments, i.e. equivalent changes or modifications to the spirit of the present utility model are still within the scope of the present utility model.
Claims (8)
1. The MOPA structure laser emission system for the laser radar is characterized by comprising a seed source laser emission device, a laser amplification device and an isolation device which are sequentially connected in an optical path; the laser beam combining device is used for combining the laser beam emitted by the pump source; the seed source laser emission device is used for emitting signal light and comprises a seed source array, a seed source array beam collimation device and a seed source array beam coupling device which are sequentially connected through optical paths; the pumping source laser emission device comprises a pumping source array, a pumping source array beam collimation device and a pumping source array beam coupling device which are sequentially connected through optical paths; the seed source array and the pump source array comprise VCSEL arrays; the seed source array beam collimation device and the pump source array beam collimation device are used for collimating corresponding array beams; the seed source array beam coupling device and the pump source array beam coupling device are used for focusing and coupling corresponding array beams into the optical fiber; the beam combining device comprises a beam combiner, the laser amplifying device comprises a gain optical fiber, and the isolating device comprises an isolator; the beam combiner is used for coupling pump light into the gain optical fiber; the gain fiber is used for absorbing the pump light and amplifying the signal light; the isolator is used for outputting amplified signal light in one direction and isolating light transmitted in the backward direction.
2. The laser transmitter system of MOPA structure for lidar of claim 1, wherein the pump source laser transmitter device comprises a forward pump source laser transmitter device and/or a reverse pump source laser transmitter device; the forward pumping source laser emission device and the seed source laser emission device are positioned on the same side of the laser amplification device; the reverse pumping source laser emission device and the seed source laser emission device are respectively positioned at two sides of the laser amplification device.
3. The laser transmitter system of claim 1, wherein the seed source array beam collimator and the pump source array beam collimator each comprise a microlens array; the microlens array corresponds to the VCSEL array one by one.
4. A MOPA structured laser transmitter system as defined in claim 3, wherein the microlenses in the microlens array are spherical or aspherical or cylindrical.
5. The laser transmitter system of claim 1, wherein the seed source array beam coupling device and the pump source array beam coupling device each comprise a coupling lens.
6. The laser emitting system of MOPA structures for lidar of claim 1, wherein the seed source emits a signal having a wavelength of 1.5um.
7. The laser emitting system of MOPA structure for laser radar as claimed in claim 1, wherein the wavelength of the pump light emitted from the pump source is 900nm to 1000nm.
8. The laser transmitter system of MOPA structure for laser radar as claimed in claim 1, wherein a first-stage amplifier is composed of a gain fiber, a pump source laser transmitter and a beam combiner; the system is provided with a plurality of stages of amplifiers which are cascaded in turn.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321977093.4U CN220381286U (en) | 2023-07-26 | 2023-07-26 | Laser emission system of MOPA structure for laser radar |
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| CN202321977093.4U CN220381286U (en) | 2023-07-26 | 2023-07-26 | Laser emission system of MOPA structure for laser radar |
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