CN116699561A - Multi-beam laser transceiver based on optical fiber path - Google Patents
Multi-beam laser transceiver based on optical fiber path Download PDFInfo
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- CN116699561A CN116699561A CN202310659129.2A CN202310659129A CN116699561A CN 116699561 A CN116699561 A CN 116699561A CN 202310659129 A CN202310659129 A CN 202310659129A CN 116699561 A CN116699561 A CN 116699561A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Electromagnetism (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The application provides a multi-beam laser receiving and transmitting device based on an optical fiber path, and relates to the technical field of photoelectric detection. The multi-beam laser receiving and transmitting device based on the optical fiber path adopts a receiving and transmitting split structure form and comprises: the device comprises a multipath output pulse fiber laser, a two-dimensional distribution transmitting fiber array, a transmitting lens group, a receiving lens group, a two-dimensional distribution receiving fiber array and a narrow-band multimode fiber filter; the application generates multi-beam laser with precise space arrangement, realizes the laser pulse energy emission with single-beam nanosecond pulse width and more than tens of micro-joules, and solves the problems of large volume, poor light path stability, serious vibration influence and the like of a multi-beam laser receiving and transmitting system.
Description
Technical Field
The application relates to the technical field of photoelectric detection, in particular to a multi-beam laser transceiver based on an optical fiber path.
Background
The laser radar is an active photoelectric detection technology, utilizes the characteristics of good laser directivity, high energy density and the like, can realize high-precision remote target detection and ranging, and has the advantages of working all day time, being little influenced by electromagnetic interference and the like; early laser radar emits a single laser beam to perform two-dimensional scanning in space, and target detection and imaging are realized through a single-point ranging method; however, the two-dimensional scanning device is complicated in structure, resulting in a large system volume, and a long two-dimensional space scanning time, and low target detection and imaging efficiency.
Along with the continuous improvement of the technical level of lasers, photoelectric detectors and the like, the laser radar is developed from single-point scanning to line scanning, array imaging and the like, so that the volume, the weight and the power consumption of the system are further reduced, and the laser radar is applied to airborne, satellite-borne and other platforms. The multi-beam laser radar is a laser remote sensing detection technology which is currently applied more, and the instantaneous detection field of the system is greatly increased by transmitting a plurality of beams at the same time, so that high-efficiency remote sensing detection is realized. According to the NASA project in the United states, the multi-beam laser radar can realize the emission of more than 1000 beams, and is applied to the survey of resource environments such as satellite-borne topographic mapping, forests, glaciers, oceans and the like.
Multi-beam laser emission is one of the keys of multi-beam lidar, and currently, two modes of space optical beam splitting emission and diffraction beam splitter (DOE) beam splitting emission are mainly adopted. The literature (experimental verification of high-precision transceiving registration method of multi-beam laser radar) (infrared and laser engineering, 2017, 46 (7)) uses a 1064nm space light output solid laser as a main light source, and the output end of the laser is subjected to power distribution through a space light beam splitter to obtain 13 paths of space light, and then subjected to 1-to-4 beam splitting to obtain 52 paths of laser output; the document research of a high-precision transceiving matching method of a multi-beam three-dimensional imaging laser radar (telemetry and remote control, 2022, 43 (3)) adopts a diffraction beam splitter DOE and a beam expander to realize diffraction and splitting of laser output by a fiber laser and generate 64 beams which are obliquely distributed in a 16 multiplied by 4 way.
However, the DOE spectroscopic emission method occupies a small volume, but DOE spectroscopic is not uniform and the emitted beam power is limited; the main problems of space beam splitting emission are that the space beam splitter has large volume, needs to be precisely adjusted and has strict requirements on vibration conditions.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the application provides a multi-beam laser receiving and transmitting device based on an optical fiber optical path, which solves the problems of precise spatial arrangement of multi-beam lasers, high-energy nanosecond pulse laser emission, large volume of a multi-beam laser receiving and transmitting system, precise adjustment and severe requirements on vibration conditions.
(II) technical scheme
In order to achieve the above purpose, the application is realized by the following technical scheme:
the utility model provides a multi-beam laser transceiver based on optic fibre light path, multi-beam laser transceiver based on optic fibre light path adopts and receives and dispatches the split structural style, includes: the device comprises a multipath output pulse fiber laser, a two-dimensional distribution transmitting fiber array, a transmitting lens group, a receiving lens group, a two-dimensional distribution receiving fiber array and a narrow-band multimode fiber filter;
the output ends of the multiple groups of the multipath output pulse fiber lasers are connected with fiber pigtails of the two-dimensional distribution transmitting fiber array one by one; the end faces of the two-dimensional distribution transmitting optical fiber arrays are fixed on the focal plane of the transmitting lens group; the optical axis of the transmitting lens group is parallel to the optical axis of the receiving lens group; the end faces of the two-dimensional distribution receiving optical fiber arrays are fixed on the focal plane of the receiving lens group; the two-dimensional distribution receiving optical fiber tail fibers of the optical fiber array are connected with a plurality of narrow-band multimode optical fiber filters one by one;
multiple groups of the multipath output pulse fiber lasers are triggered by the same external pulse electric signal to generate pulse synchronous multi-beam lasers, the multi-beam space arrangement is realized through a two-dimensional arrangement transmitting fiber array, and the multi-beam laser collimation emission is realized through a transmitting lens group; the receiving lens group couples the multi-beam laser echoes to the two-dimensional arrangement receiving optical fiber array, and the narrow-band multimode optical fiber filter filters stray light backgrounds except laser wavelengths in each path of receiving optical fibers.
Preferably, the multi-output pulse fiber laser adopts a two-stage parallel fiber amplifying structure, and comprises: the device comprises a semiconductor seed source, a primary optical fiber amplifier, a primary optical fiber splitter, a secondary optical fiber amplifier, a secondary optical fiber splitter and an optical fiber flange; the primary optical fiber amplifier and the secondary optical fiber amplifier adopt large-mode-field gain optical fibers with the same core diameter; the primary optical fiber branching device and the secondary optical fiber branching device adopt large-mode-field optical fibers matched with the core diameter of the optical fiber amplifier, and realize 1-to-4 optical fiber branching in a cascading mode by utilizing a 50:50 beam splitting wave plate; the semiconductor seed source, the primary optical fiber amplifier and the primary optical fiber branching device are sequentially connected in series; the 4-way output end of the primary optical fiber branching device is connected with the input ends of the 4 secondary optical fiber amplifiers; the output ends of the 4 secondary optical fiber amplifiers are respectively connected with the input ends of the 4 secondary optical fiber splitters, and the output ends of the secondary optical fiber splitters are connected to the optical fiber flanges;
the semiconductor seed source adopts an active Q-switching mode, nanosecond pulse width laser is generated under the triggering of an external pulse electric signal, 16 paths of fiber lasers are generated through two-stage parallel fiber amplification, and the pulse energy of each path of fiber lasers reaches tens of micro-joules.
Preferably, the two-dimensional arrangement emitting optical fiber array adopts multimode optical fibers, and the core diameter of the emitting optical fibers is matched with the core diameter of the output optical fibers of the multipath output pulse optical fiber laser; the emitting optical fibers are arranged in a two-dimensional diamond manner on the end face of the optical fiber array, the rows are staggered, and projections in the vertical direction are closely connected; the optical fiber arrangement form and the interval of the two-dimensional arrangement receiving optical fiber array are the same as those of the two-dimensional arrangement transmitting optical fiber array, the receiving optical fibers adopt multimode optical fibers, and the core diameter of the receiving optical fibers is not smaller than that of the transmitting optical fibers.
Preferably, the emission lens group and the receiving lens group adopt a Gaussian lens structure form and are designed into an image space telecentric imaging system; the transmitting lens group and the receiving lens group adopt the same design parameters, aberration correction is carried out, and the optical fiber coupling efficiency is improved.
Preferably, the narrow-band multimode fiber filter adopts multimode fiber matched with the core diameter of the receiving fiber, and adopts a dense wavelength division multiplexing wave plate to carry out narrow-band filtering.
Preferably, the multi-beam laser receiving and transmitting device based on the optical fiber path firstly utilizes a large-caliber collimator and a six-dimensional precise adjusting mechanism to adjust the positions of a transmitting optical fiber array and a receiving optical fiber array in a laboratory to realize multi-beam receiving and transmitting registration; and then adjusting the position of the receiving optical fiber array in the external field according to the overlapping degree of the long-distance light spots and the receiving echo intensity, so that the receiving and transmitting fields of the multiple light beams overlap with each other, and the echo intensity reaches the highest.
(III) beneficial effects
The application provides a multi-beam laser transceiver based on an optical fiber path. Compared with the prior art, the method has the following beneficial effects:
in the application, the multi-beam laser transceiver based on the optical fiber path adopts a transceiver split structure, comprising: the device comprises a multipath output pulse fiber laser, a two-dimensional distribution transmitting fiber array, a transmitting lens group, a receiving lens group, a two-dimensional distribution receiving fiber array and a narrow-band multimode fiber filter; the output ends of the multiple groups of the multipath output pulse fiber lasers are connected with fiber pigtails of the two-dimensional distribution transmitting fiber array one by one; the end faces of the two-dimensional distribution transmitting optical fiber arrays are fixed on the focal plane of the transmitting lens group; the optical axis of the transmitting lens group is parallel to the optical axis of the receiving lens group; the end faces of the two-dimensional distribution receiving optical fiber arrays are fixed on the focal plane of the receiving lens group; the two-dimensional distribution receiving optical fiber tail fibers of the optical fiber array are connected with a plurality of narrow-band multimode optical fiber filters one by one; multiple groups of the multipath output pulse fiber lasers are triggered by the same external pulse electric signal to generate pulse synchronous multi-beam lasers, the multi-beam space arrangement is realized through a two-dimensional arrangement transmitting fiber array, and the multi-beam laser collimation emission is realized through a transmitting lens group; the receiving lens group couples the multi-beam laser echoes to the two-dimensional arrangement receiving optical fiber array, and the narrow-band multimode optical fiber filter filters stray light backgrounds except laser wavelengths in each path of receiving optical fibers. The application generates multi-beam laser with precise space arrangement, realizes the laser pulse energy emission with single-beam nanosecond pulse width and more than tens of micro-joules, and solves the problems of large volume, poor light path stability, serious vibration influence and the like of a multi-beam laser receiving and transmitting system.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a multi-beam laser transceiver based on an optical fiber path in an embodiment of the present application;
FIG. 2 is a schematic diagram of a multiplexing pulse fiber laser according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a two-dimensional array of optical fibers according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The multi-beam laser receiving and transmitting device based on the optical fiber path solves the problems that a multi-beam laser is precisely arranged in space, high-energy nanosecond pulse laser is emitted, and a multi-beam laser receiving and transmitting system is large in size, needs precise adjustment and has severe requirements on vibration conditions.
The technical scheme in the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
in the embodiment of the application, the multi-beam laser transceiver based on the optical fiber path adopts a transceiver split structure, and comprises: the device comprises a multipath output pulse fiber laser, a two-dimensional distribution transmitting fiber array, a transmitting lens group, a receiving lens group, a two-dimensional distribution receiving fiber array and a narrow-band multimode fiber filter; the output ends of the multiple groups of the multipath output pulse fiber lasers are connected with fiber pigtails of the two-dimensional distribution transmitting fiber array one by one; the end faces of the two-dimensional distribution transmitting optical fiber arrays are fixed on the focal plane of the transmitting lens group; the optical axis of the transmitting lens group is parallel to the optical axis of the receiving lens group; the end faces of the two-dimensional distribution receiving optical fiber arrays are fixed on the focal plane of the receiving lens group; the two-dimensional distribution receiving optical fiber tail fibers of the optical fiber array are connected with a plurality of narrow-band multimode optical fiber filters one by one; multiple groups of the multipath output pulse fiber lasers are triggered by the same external pulse electric signal to generate pulse synchronous multi-beam lasers, the multi-beam space arrangement is realized through a two-dimensional arrangement transmitting fiber array, and the multi-beam laser collimation emission is realized through a transmitting lens group; the receiving lens group couples the multi-beam laser echoes to the two-dimensional arrangement receiving optical fiber array, and the narrow-band multimode optical fiber filter filters stray light backgrounds except laser wavelengths in each path of receiving optical fibers. A two-stage parallel optical fiber amplification structure is adopted to solve the problem of high-energy nanosecond pulse laser emission; the two-dimensional arrangement fiber array is adopted to solve the problem of spatial precise arrangement of multi-beam lasers; the optical fiber path solves the problems of large volume, poor stability, large influence by vibration and the like of the existing multi-beam splitting mode by utilizing the characteristics of high integration level, bending property, high stability and the like of an optical fiber device.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Examples:
as shown in fig. 1, the present application provides a multi-beam laser transceiver based on an optical fiber path, where the multi-beam laser transceiver based on the optical fiber path adopts a transceiver split structure, and includes: the device comprises a multipath output pulse fiber laser, a two-dimensional distribution transmitting fiber array, a transmitting lens group, a receiving lens group, a two-dimensional distribution receiving fiber array and a narrow-band multimode fiber filter;
the output ends of the multiple groups of the multipath output pulse fiber lasers are connected with fiber pigtails of the two-dimensional distribution transmitting fiber array one by one; the end faces of the two-dimensional distribution transmitting optical fiber arrays are fixed on the focal plane of the transmitting lens group; the optical axis of the transmitting lens group is parallel to the optical axis of the receiving lens group; the end faces of the two-dimensional distribution receiving optical fiber arrays are fixed on the focal plane of the receiving lens group; the two-dimensional distribution receiving optical fiber tail fibers of the optical fiber array are connected with a plurality of narrow-band multimode optical fiber filters one by one;
multiple groups of the multipath output pulse fiber lasers are triggered by the same external pulse electric signal to generate pulse synchronous multi-beam lasers, the multi-beam space arrangement is realized through a two-dimensional arrangement transmitting fiber array, and the multi-beam laser collimation emission is realized through a transmitting lens group; the receiving lens group couples the multi-beam laser echoes to the two-dimensional arrangement receiving optical fiber array, and the narrow-band multimode optical fiber filter filters stray light backgrounds except laser wavelengths in each path of receiving optical fibers.
As shown in fig. 2, the multi-output pulse fiber laser adopts a two-stage parallel fiber amplifying structure, and includes: the device comprises a semiconductor seed source, a primary optical fiber amplifier, a primary optical fiber splitter, a secondary optical fiber amplifier, a secondary optical fiber splitter and an optical fiber flange; the primary optical fiber amplifier and the secondary optical fiber amplifier adopt large-mode-field gain optical fibers with the same core diameter; the primary optical fiber branching device and the secondary optical fiber branching device adopt large-mode-field optical fibers matched with the core diameter of the optical fiber amplifier, and realize 1-to-4 optical fiber branching in a cascading mode by utilizing a 50:50 beam splitting wave plate; the semiconductor seed source, the primary optical fiber amplifier and the primary optical fiber branching device are sequentially connected in series; the 4-way output end of the primary optical fiber branching device is connected with the input ends of the 4 secondary optical fiber amplifiers; the output ends of the 4 secondary optical fiber amplifiers are respectively connected with the input ends of the 4 secondary optical fiber splitters, and the output ends of the secondary optical fiber splitters are connected to the optical fiber flanges;
the semiconductor seed source adopts an active Q-switching mode, nanosecond pulse width laser is generated under the triggering of an external pulse electric signal, 16 paths of fiber lasers are generated through two-stage parallel fiber amplification, and the pulse energy of each path of fiber lasers reaches tens of micro-joules.
As shown in fig. 3, the two-dimensional arrangement emitting optical fiber array adopts multimode optical fibers, and the core diameter of the emitting optical fibers is matched with the core diameter of the output optical fibers of the multipath output pulse optical fiber laser; the emitting optical fibers are arranged in a two-dimensional diamond manner on the end face of the optical fiber array, the rows are staggered, and projections in the vertical direction are closely connected; the optical fiber arrangement form and the interval of the two-dimensional arrangement receiving optical fiber array are the same as those of the two-dimensional arrangement transmitting optical fiber array, the receiving optical fibers adopt multimode optical fibers, and the core diameter of the receiving optical fibers is not smaller than that of the transmitting optical fibers.
The transmitting lens group and the receiving lens group adopt a Gaussian lens structure form and are designed into an image space telecentric imaging system; the transmitting lens group and the receiving lens group adopt the same design parameters, aberration correction is carried out, and the optical fiber coupling efficiency is improved.
The narrow-band multimode fiber filter adopts multimode fiber matched with the core diameter of the receiving fiber, and adopts a dense wavelength division multiplexing wave plate to carry out narrow-band filtering.
The multi-beam laser receiving and transmitting device based on the optical fiber path firstly utilizes a large-caliber collimator and a six-dimensional precise adjusting mechanism to adjust the positions of a transmitting optical fiber array and a receiving optical fiber array in a laboratory to realize multi-beam receiving and transmitting registration; and then adjusting the position of the receiving optical fiber array in the external field according to the overlapping degree of the long-distance light spots and the receiving echo intensity, so that the receiving and transmitting fields of the multiple light beams overlap with each other, and the echo intensity reaches the highest.
In summary, compared with the prior art, the application has the following beneficial effects:
1. in the embodiment of the application, the multi-beam laser transceiver based on the optical fiber path adopts a transceiver split structure, and comprises: the device comprises a multipath output pulse fiber laser, a two-dimensional distribution transmitting fiber array, a transmitting lens group, a receiving lens group, a two-dimensional distribution receiving fiber array and a narrow-band multimode fiber filter;
the output ends of the multiple groups of the multipath output pulse fiber lasers are connected with fiber pigtails of the two-dimensional distribution transmitting fiber array one by one; the end faces of the two-dimensional distribution transmitting optical fiber arrays are fixed on the focal plane of the transmitting lens group; the optical axis of the transmitting lens group is parallel to the optical axis of the receiving lens group; the end faces of the two-dimensional distribution receiving optical fiber arrays are fixed on the focal plane of the receiving lens group; the two-dimensional distribution receiving optical fiber tail fibers of the optical fiber array are connected with a plurality of narrow-band multimode optical fiber filters one by one;
multiple groups of the multipath output pulse fiber lasers are triggered by the same external pulse electric signal to generate pulse synchronous multi-beam lasers, the multi-beam space arrangement is realized through a two-dimensional arrangement transmitting fiber array, and the multi-beam laser collimation emission is realized through a transmitting lens group; the receiving lens group couples the multi-beam laser echoes to a two-dimensional arrangement receiving optical fiber array, and a narrow-band multimode optical fiber filter filters stray light backgrounds except laser wavelengths in each path of receiving optical fibers; the optical fiber path solves the problems of large volume, poor stability, large influence by vibration and the like of the existing multi-beam splitting mode by utilizing the characteristics of high integration level, bending property, high stability and the like of an optical fiber device.
2. In the embodiment of the application, the pulse laser synchronous emission is performed by utilizing a parallel connection mode of a plurality of fiber lasers, so that the laser emission power can be improved according to the number of the fiber lasers, the limitation that only one laser is used in the existing multi-beam laser beam splitting mode is overcome, and the emission beam power is improved.
3. In the embodiment of the application, the 50:50 beam splitter is adopted to manufacture the optical fiber splitter, and the beam splitting ratio can be adjusted in real time by monitoring the optical power in the manufacturing process, so that the beam splitting energy consistency is ensured, and the problem of uneven multi-beam emission power is solved.
4. In the embodiment of the application, the two-dimensional arrangement of the emitting optical fiber array and the emitting lens group are adopted to realize the space emission of the multi-beam laser, and the precise arrangement of the multi-beam laser in space can be realized through the precise arrangement of the emitting optical fibers.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (6)
1. The utility model provides a multi-beam laser transceiver based on optic fibre light path, its characterized in that, multi-beam laser transceiver based on optic fibre light path adopts and receives and dispatches the split structural style, includes: the device comprises a multipath output pulse fiber laser, a two-dimensional distribution transmitting fiber array, a transmitting lens group, a receiving lens group, a two-dimensional distribution receiving fiber array and a narrow-band multimode fiber filter;
the output ends of the multiple groups of the multipath output pulse fiber lasers are connected with fiber pigtails of the two-dimensional distribution transmitting fiber array one by one; the end faces of the two-dimensional distribution transmitting optical fiber arrays are fixed on the focal plane of the transmitting lens group; the optical axis of the transmitting lens group is parallel to the optical axis of the receiving lens group; the end faces of the two-dimensional distribution receiving optical fiber arrays are fixed on the focal plane of the receiving lens group; the two-dimensional distribution receiving optical fiber tail fibers of the optical fiber array are connected with a plurality of narrow-band multimode optical fiber filters one by one;
multiple groups of the multipath output pulse fiber lasers are triggered by the same external pulse electric signal to generate pulse synchronous multi-beam lasers, the multi-beam space arrangement is realized through a two-dimensional arrangement transmitting fiber array, and the multi-beam laser collimation emission is realized through a transmitting lens group; the receiving lens group couples the multi-beam laser echoes to the two-dimensional arrangement receiving optical fiber array, and the narrow-band multimode optical fiber filter filters stray light backgrounds except laser wavelengths in each path of receiving optical fibers.
2. The multi-beam laser transceiver device based on the optical fiber path according to claim 1, wherein the multi-output pulse optical fiber laser adopts a two-stage parallel optical fiber amplifying structure, comprising: the device comprises a semiconductor seed source, a primary optical fiber amplifier, a primary optical fiber splitter, a secondary optical fiber amplifier, a secondary optical fiber splitter and an optical fiber flange; the primary optical fiber amplifier and the secondary optical fiber amplifier adopt large-mode-field gain optical fibers with the same core diameter; the primary optical fiber branching device and the secondary optical fiber branching device adopt large-mode-field optical fibers matched with the core diameter of the optical fiber amplifier, and realize 1-to-4 optical fiber branching in a cascading mode by utilizing a 50:50 beam splitting wave plate; the semiconductor seed source, the primary optical fiber amplifier and the primary optical fiber branching device are sequentially connected in series; the 4-way output end of the primary optical fiber branching device is connected with the input ends of the 4 secondary optical fiber amplifiers; the output ends of the 4 secondary optical fiber amplifiers are respectively connected with the input ends of the 4 secondary optical fiber splitters, and the output ends of the secondary optical fiber splitters are connected to the optical fiber flanges;
the semiconductor seed source adopts an active Q-switching mode, nanosecond pulse width laser is generated under the triggering of an external pulse electric signal, 16 paths of fiber lasers are generated through two-stage parallel fiber amplification, and the pulse energy of each path of fiber lasers reaches tens of micro-joules.
3. The multi-beam laser transceiver device based on the optical fiber path as claimed in claim 1, wherein said two-dimensional arrangement emitting optical fiber array adopts multimode optical fibers, and the emitting optical fiber core diameter is matched with the output optical fiber core diameter of the multi-output pulse optical fiber laser; the emitting optical fibers are arranged in a two-dimensional diamond manner on the end face of the optical fiber array, the rows are staggered, and projections in the vertical direction are closely connected; the optical fiber arrangement form and the interval of the two-dimensional arrangement receiving optical fiber array are the same as those of the two-dimensional arrangement transmitting optical fiber array, the receiving optical fibers adopt multimode optical fibers, and the core diameter of the receiving optical fibers is not smaller than that of the transmitting optical fibers.
4. The multi-beam laser transceiver based on the optical fiber path as claimed in claim 1, wherein the emission lens group and the receiving lens group adopt a gaussian lens structure form and are designed into an image space telecentric imaging system; the transmitting lens group and the receiving lens group adopt the same design parameters, aberration correction is carried out, and the optical fiber coupling efficiency is improved.
5. The multi-beam laser transceiver device based on the optical fiber path according to claim 1, wherein the narrow-band multimode optical fiber filter adopts multimode optical fibers matched with the core diameter of the receiving optical fiber, and adopts a dense wavelength division multiplexing wave plate for narrow-band filtering.
6. The multi-beam laser transceiver based on the optical fiber path according to claim 1, wherein the multi-beam laser transceiver based on the optical fiber path firstly uses a large-caliber collimator and a six-dimensional precise adjustment mechanism to adjust the positions of an emitting optical fiber array and a receiving optical fiber array in a laboratory to realize multi-beam receiving-transmitting registration; and then adjusting the position of the receiving optical fiber array in the external field according to the overlapping degree of the long-distance light spots and the receiving echo intensity, so that the receiving and transmitting fields of the multiple light beams overlap with each other, and the echo intensity reaches the highest.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310659129.2A CN116699561A (en) | 2023-06-05 | 2023-06-05 | Multi-beam laser transceiver based on optical fiber path |
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