CN116191187A - High-stability high-energy solid laser suitable for meter scattering laser radar - Google Patents
High-stability high-energy solid laser suitable for meter scattering laser radar Download PDFInfo
- Publication number
- CN116191187A CN116191187A CN202210981640.XA CN202210981640A CN116191187A CN 116191187 A CN116191187 A CN 116191187A CN 202210981640 A CN202210981640 A CN 202210981640A CN 116191187 A CN116191187 A CN 116191187A
- Authority
- CN
- China
- Prior art keywords
- laser
- module
- energy
- pump source
- stability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
- H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
-
- 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
-
- 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
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1312—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Automation & Control Theory (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Lasers (AREA)
Abstract
The invention relates to a high-stability high-energy solid laser suitable for a Mie scattering laser radar, which comprises a pumping coupling module, a fundamental frequency oscillation module, a frequency doubling module, a laser beam splitting module, an energy monitoring module, a Q switch driver and an LD controller, wherein the pumping coupling module is connected with the fundamental frequency oscillation module; the pump coupling module adopts an end-face double-side pump structure; the fundamental frequency oscillation module adopts an orthogonal double-Paul structure resonant cavity; the energy monitoring module monitors output laser energy in real time, provides feedback signals of LD power supply current for the LD controller, and can provide basis for laser output energy correction in laser radar atmospheric parameter inversion. The invention can realize high energy, high stability, high reliability, high beam quality and polarized pulse laser output, has smaller laser volume and weight, and can be used as a light source of the Mie scattering laser radar applied to multiple platforms such as foundations, vehicles, machine carriers and the like.
Description
Technical Field
The invention relates to a high-stability high-energy solid laser suitable for a Mie scattering laser radar, belongs to the technical field of lasers in the laser radar, and can be used as a light source of the laser radar.
Background
Atmospheric pollutants can be classified into gaseous pollutants and atmospheric particulates, depending on the conditions in which the atmospheric pollutants are present. Atmospheric particulates are a generic term for various solid and liquid particulates present in the atmosphere, also known as aerosols. As a constituent of the atmosphere, the atmospheric particulates have important effects on cloud and precipitation, atmospheric radiation balance, global climate change and the like, as well as important effects on atmospheric visibility, traffic safety and human health. Therefore, the method has great significance for detecting the atmospheric particulates.
Lidar is an effective tool for detecting the atmosphere by measuring the back-scattered signal of the interaction of an emitted laser beam with particles in the atmosphere to invert the aerosol extinction coefficients at different heights. In the transmission process of laser in the atmosphere, besides being absorbed by the atmosphere, various scattering processes such as Rayleigh scattering of laser and small-scale atmospheric molecules, rice scattering of large-scale aerosol particles, depolarization scattering of non-spherical particles, raman scattering with frequency change and the like can be generated. The Mie scattering laser radar based on the Mie scattering theory can directly obtain the extinction coefficients of the atmospheric aerosols at different heights on the laser beam transmission path, and can also obtain various atmospheric optical parameters such as depolarization degree, atmospheric visibility, atmospheric boundary layer height, aerosol optical thickness and the like.
The laser is used as a key single machine of the Mie scattering laser radar, and the laser outputs indexes such as central wavelength, single pulse energy, beam divergence angle, pulse repetition frequency and the like, so that the technical requirements such as effective detection height and time resolution of the Mie scattering laser radar are determined. At present, an all-solid-state laser with a center wavelength of 532nm and an optical fiber laser are commonly used as light sources of the Mie scattering laser radar. All-solid-state lasers and fiber lasers are used as two branches of solid-state lasers, and the main advantage of all-solid-state lasers is that single-pulse high-energy laser output is easier to obtain compared with all-solid-state lasers and fiber lasers, while the advantage of fiber lasers is that high-stability laser output is easier to obtain. In order to make the Mie scattering laser radar suitable for multi-platform applications such as foundation, vehicle-mounted, airborne and the like, a high-stability and high-energy solid laser is required to be used as a light source. Therefore, the research and development of the high-stability high-energy solid laser suitable for the Mie scattering laser radar as a laser radar light source has not only real urgent demands but also technical challenges, and has important significance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-stability high-energy solid laser suitable for a Mie scattering laser radar.
The invention adopts the following technical scheme:
the invention relates to a high-stability high-energy solid laser, which comprises a pumping coupling module, a fundamental frequency oscillation module, a frequency multiplication module, a laser beam splitting module, an energy monitoring module, a Q switch driver and an LD controller, wherein the pumping coupling module is connected with the fundamental frequency oscillation module;
the energy monitoring module can monitor 532nm laser energy output by the laser in real time and is used for correcting the laser output energy in atmospheric parameter inversion of the Mie scattering laser radar;
the energy monitoring module can provide a feedback signal for the LD controller, and under the condition that the output energy obviously changes when the laser works for a long time, the power supply current of the LD is regulated according to the feedback signal, so that the long-time stability of the output energy of the laser is improved;
the Q-switch driver provides the working voltage for the electro-optical Q-switch, and the working voltage is 1/4λ high voltage.
The LD controller provides the LD optical fiber pump source 1 and the LD optical fiber pump source 2 with the pump frequency and the pump pulse width regulated in the pulse pump mode;
the LD controller provides a synchronous clock signal for the Q-switch driver.
The invention discloses a pump coupling module in a high-stability high-energy solid laser, which comprises a forward pump coupling module and a backward pump coupling module; the forward pumping coupling module and the backward pumping coupling module have the same structure; the forward pumping coupling module comprises an LD optical fiber pumping source 1, a pumping source collimating lens 1 and a pumping source focusing lens 1; the backward pumping coupling module comprises an LD optical fiber pumping source 2, a pumping source collimating lens 2 and a pumping source focusing lens 2; in the invention, a pump source collimating lens 1, a pump source focusing lens 1, a pump source collimating lens 2 and a pump source focusing lens 2 are all plated with 808nm high-transmittance film layers.
The fundamental frequency oscillation module comprises a laser medium, a Porro prism 1, a 0.57 lambda wave plate, an electro-optical Q switch, a polaroid, a dichroic mirror 1, a dichroic mirror 2, PBS, a 1/4 lambda wave plate and a Porro prism 2; in the invention, the light-passing surfaces of the middle-pass prism 1 and the Porro prism 2 are plated with 1064nm high-transmittance film layers; in the invention, the light-passing surfaces of the dichroic mirror 1 and the dichroic mirror 2 are plated with a film layer with 808nm high-transmittance filter and 1064nm high reflectivity when placed at 45 degrees.
The frequency doubling module comprises a fundamental frequency collimating lens, a fundamental frequency focusing lens and a frequency doubling crystal; the fundamental frequency collimating lens is plated with a 1064nm high-transmittance film layer; the fundamental frequency focusing lens is plated with a 1064nm high-transmittance film layer; in the invention, the frequency doubling crystal is clamped in the heat sink to dissipate heat.
The laser beam splitting module comprises a beam splitting mirror, a dichroic mirror 3 and an optical collector; the beam splitter is plated with a 532nm high-reflectivity film layer with 95% of the transmitted filter film layer and 1064nm high reflectivity; in the invention, the dichroic mirror 3 is plated with a 532nm high-transmittance filter film layer and a 1064nm high-reflectivity filter film layer.
The energy monitoring module comprises an attenuation sheet, a narrow-band optical filter and a photoelectric detector.
The invention discloses a resonant cavity of a quadrature Porro prism structure, which is formed by a Porro prism 1 and a Porro prism 2 of a fundamental frequency oscillation module in a high-stability high-energy solid laser.
The 0.57 lambda wave plate in the high-stability high-energy solid laser can compensate the phase delay of the Porro prism 1; the combination of the rib prism 1 and the 0.57 lambda wave plate realizes the high reflectivity of the total reflection surface of the rib prism 1 for fundamental frequency laser;
the electro-optical Q switch in the high-stability high-energy solid laser adopts a back-pressure working mode; the polaroid is used for detecting the polarization of the working state of the electro-optical Q switch.
The polarization coupling output of fundamental frequency laser light is realized by combining the Baolor prism 2, the 1/4 lambda wave plate and the PBS in the high-stability high-energy solid laser; through the adjustment of the rotation angle of the 1/4 lambda wave plate, the continuous adjustable PBS coupling output rate is realized.
The optical collector in the high-stability high-energy solid laser is an inner cone-shaped metal barrel, and the inner cone-shaped metal is oxidized and blackened and is used for collecting 1064nm fundamental frequency laser and preventing 1064nm fundamental frequency laser from being reflected.
The invention relates to a high-stability high-energy solid laser, wherein a focusing light spot of an LD optical fiber pumping source 1 is regulated by a pumping source collimating lens 1 and a pumping source focusing lens 1; in the invention, the focusing light spot of the LD optical fiber pump source 2 is regulated by adopting a pump source collimating lens 2 and a pump source focusing lens 2; in the invention, focusing light spots of the LD optical fiber pump source 1 and the LD optical fiber pump source 2 are respectively positioned at the positions which are 1/3 of the length from the front end face and the rear end face of the laser medium.
The ridge line of the Baolor prism 1 in the high-stability high-energy solid laser is placed at an angle of 45 degrees with the horizontal direction; in the invention, the edge line of the Porro prism 2 and the edge line of the Porro prism 1 form 90 degrees;
the two end faces of a laser medium in the high-stability high-energy solid laser are cut at 87 degrees, and meanwhile, an antireflection film with the thickness of 1064nm is plated; in the invention, the other four sides of the laser medium are plated with gold and indium is welded in the heat sink to dissipate heat.
The invention has the advantages that:
1) Compared with the traditional plane mirror resonant cavity, the orthogonal double-Porro prism is adopted as a resonant cavity mirror of the laser, and can ensure the oscillation of the optical path when the laser is impacted, vibrated and the cavity mirror is detuned, so that the stability of the optical path can be effectively improved, and the laser has the characteristics of high detuning resistance and high vibration resistance.
2) The pulse pumping mode is adopted, no redundant waste heat is generated in the laser medium, and the electro-optical conversion efficiency of the laser is improved; the pumping laser pulse width output by the pumping source LD is narrow, and the peak power is high, so that the compression of the laser pulse width output by the fundamental frequency oscillation module is facilitated.
3) The double-end pumping mode is adopted, so that the uniformity of pumping energy in the laser medium is improved, and the saturation threshold of the pumping energy absorbed by the laser medium can be improved; meanwhile, due to the end-face pumping structure, the mode matching performance is improved, and the laser output of the beam quality is facilitated.
4) The energy monitoring module is used for feeding back the LD controller, so that the long-time stability of the output energy is improved; meanwhile, the method is favorable for correcting the laser output energy in atmospheric parameter inversion by the Mie scattering laser radar.
Drawings
FIG. 1 is a schematic diagram of a high-stability high-energy solid-state laser suitable for use in Mie scattering lidar
FIG. 2 is an optical schematic diagram of a high-stability high-energy solid-state laser suitable for Mie scattering lidar
In fig. 2: a 1 pump coupling module, a 11 forward pump coupling module, a 12 backward pump coupling module, a 111 LD optical fiber pump source 1, a 112 pump source collimating lens 1, a 113 pump source focusing lens 1, a 121 LD optical fiber pump source 2, a 122 pump source collimating lens 2, a 123 pump source focusing lens 2, a 2 fundamental frequency oscillation module, a 20 laser medium, a 21 Porro prism 1, a 22 0.57 lambda plate, a 23 electro-optic Q switch, a 24 polarizer, a 25 dichroic mirror 1, a 26 dichroic mirror 2, a 27 PBS, a 28 1/4 lambda plate, a 29 Porro prism 2, a 3 frequency doubling module, a 31 fundamental frequency collimating lens, a 32 fundamental frequency focusing lens, a 33 frequency doubling crystal, a 4 laser beam splitting module, a 41 beam splitting mirror, a 42 dichroic mirror 3, a 43 optical collector, a 5 energy monitoring module, a 51 attenuation plate, a 52 narrow band filter, a 53 photoelectric detector, a 6Q switch driver, and a 7 LD controller.
Fig. 3 is a schematic diagram showing that the oscillation light in the fundamental frequency oscillation module is totally reflected twice in the keep-rib prism.
Fig. 4 is a schematic diagram of a structure of a laser medium in a fundamental frequency oscillation module.
Detailed Description
As shown in fig. 1, the high-stability high-energy solid laser of the present invention includes a pump coupling module 1, a fundamental frequency oscillation module 2, a frequency multiplication module 3, a laser beam splitting module 4, an energy monitoring module 5, a Q-switch driver 6 and an LD controller 7.
As shown in fig. 1, the energy monitoring module 5 in the high-stability high-energy solid laser can monitor 532nm laser energy output by the laser in real time, and is used for correcting laser output energy in atmospheric parametric inversion of the Mie scattering laser radar.
As shown in fig. 1, the energy monitoring module 5 in the high-stability high-energy solid laser can provide a feedback signal for the LD controller 7, and adjusts the LD power supply current according to the feedback signal under the condition that the output energy obviously changes when the laser works for a long time, so as to improve the long-time stability of the output energy of the laser.
As shown in fig. 1, the Q-switch driver 6 in the high-stability high-energy solid-state laser of the present invention provides an operating voltage for the electro-optical Q-switch 23, which is 1/4 lambda high voltage.
As shown in fig. 1, the LD controller 7 in the high-stability high-energy solid laser of the present invention provides the LD fiber pump source 1 111 and the LD fiber pump source 2 with the adjustment of the pump frequency and the pump pulse width in the pulse pumping mode.
As shown in fig. 1, the LD controller 7 in the high-stability high-energy solid-state laser of the present invention supplies the Q-switch driver 6 with a synchronous clock signal.
As shown in fig. 2, the pump coupling module 1 in the high-stability high-energy solid laser of the present invention comprises a forward pump coupling module 11 and a backward pump coupling module 12; the forward pump coupling module 11 and the backward pump coupling module 12 have the same structure; the forward pumping coupling module 11 comprises an LD optical fiber pumping source 1 111, a pumping source collimating lens 1 112 and a pumping source focusing lens 1 113; the backward pumping coupling module 12 comprises an LD optical fiber pumping source 2 121, a pumping source collimating lens 2 122 and a pumping source focusing lens 2 123; the pump source collimating lens 1 112, the pump source focusing lens 1 113, the pump source collimating lens 2 122 and the pump source focusing lens 2 123 are all plated with 808nm high-transmittance film layers;
as shown in fig. 2, the fundamental frequency oscillation module 2 in the high-stability high-energy solid laser of the present invention comprises a laser medium 20, a paul prism 121, a 0.57 lambda plate 22, an electro-optical Q-switch 23, a polarizer 24, a dichroic mirror 1 25, a dichroic mirror 2 26, a PBS27, a 1/4 lambda plate 28, and a paul prism 2 29; the light transmission surfaces of the Porro prism 1 and the Porro prism 2 29 are plated with 1064nm high-transmittance film layers; the light-passing surfaces of the dichroic mirror 1 and the dichroic mirror 2 and 26 are plated with a film layer with 808nm high-transmission filter and 1064nm high reflectivity when placed at 45 degrees;
as shown in fig. 2, the frequency doubling module 3 in the high-stability high-energy solid laser of the present invention comprises a fundamental frequency collimating lens 31, a fundamental frequency focusing lens 32 and a frequency doubling crystal 33; the fundamental frequency collimating lens 31 is plated with a 1064nm high-transmittance film layer; the fundamental frequency focusing lens 32 is plated with a 1064nm high-transmittance film layer; the frequency doubling crystal 33 is clamped in a heat sink for radiating;
as shown in fig. 2, the laser beam splitting module 4 in the high-stability high-energy solid laser of the present invention includes a beam splitter 41, a dichroic mirror 3 42 and an optical collector 43; the beam splitter 41 is plated with a 532nm high-reflectivity film layer with 95% of the film layer penetrating through the filter film layer and 1064nm high reflectivity; the dichroic mirror 3 42 is plated with a 532nm high-transmittance filter film layer and a 1064nm high-reflectivity film layer;
as shown in fig. 2, the energy monitoring module 5 in the high-stability high-energy solid laser of the present invention includes an attenuation sheet 51, a narrow-band filter 52 and a photodetector 53;
as shown in FIG. 2, the high-transmittance film layer in the high-stability high-energy solid laser is a film layer with a transmittance of more than 99.8%; the high-reflectivity film layer is a film layer with the reflectivity more than 99.8%.
As shown in fig. 2, the baollo prism 1 and the baollo prism 2 29 in the fundamental frequency oscillation module 2 in the high-stability high-energy solid-state laser of the invention form a resonant cavity of a cross baollo prism structure.
As shown in fig. 2, the 0.57 lambda plate 22 of the high-stability high-energy solid laser of the present invention can compensate the phase retardation of the Porro prism 1 21; the combination of the Porro prism 121 and the 0.57 lambda plate 22 is adopted to realize the high reflectivity of the total reflection surface of the Porro prism 1 for fundamental frequency laser;
as shown in fig. 2, the electro-optical Q-switch 23 in the high-stability high-energy solid laser of the present invention adopts a back-pressure type operation mode; the polaroid 24 is used for detecting the polarization of the working state of the electro-optical Q-switch 23.
As shown in fig. 2, the combination of the paul prism 2 29, the 1/4 lambda plate 28 and the PBS27 in the high-stability high-energy solid laser of the present invention realizes the polarization coupling output of fundamental frequency laser light; by adjusting the rotation angle of the 1/4 lambda plate 28, the coupling output rate of the PBS27 can be continuously adjusted.
As shown in fig. 2, the optical collector 43 in the high-stability high-energy solid laser of the present invention is an inner cone-shaped metal barrel, and the inner cone-shaped metal is oxidized and blackened for collecting 1064nm fundamental laser light while preventing 1064nm fundamental laser light from being reflected.
As shown in fig. 2, the focusing light spot of the LD optical fiber pump source 1 111 in the high-stability high-energy solid laser is adjusted by adopting a pump source collimating lens 1 112 and a pump source focusing lens 1 113; the focusing light spot of the LD optical fiber pump source 2 121 is regulated by adopting a pump source collimating lens 2 122 and a pump source focusing lens 2 123; the focusing light spots of the LD optical fiber pump source 1 111 and the LD optical fiber pump source 2 121 are respectively positioned at the positions which are 1/3 of the length from the front end face and the rear end face of the laser medium 20.
As shown in fig. 3, in the high-stability high-energy solid laser of the present invention, the ridge line of the paul prism 1 is placed at 45 ° to the horizontal direction; the ridge line of the Porro prism 2 29 forms 90 degrees with the ridge line of the Porro prism 1;
as shown in fig. 4, the two end faces of the laser medium 20 in the high-stability high-energy solid laser are cut at 87 degrees and are plated with 1064nm antireflection films; the other four sides of the laser medium 20 are plated with gold and indium is welded in a heat sink to dissipate heat.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme described in the embodiment can be modified or part of technical features can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention by the essence of the corresponding technical solutions.
Claims (10)
1. The high-stability high-energy solid laser suitable for the Mie scattering laser radar is characterized by comprising a pumping coupling module (1), a fundamental frequency oscillation module (2), a frequency doubling module (3), a laser beam splitting module (4), an energy monitoring module (5), a Q switch driver (6) and an LD controller (7).
The energy monitoring module (5) can monitor 532nm laser energy output by the laser in real time and is used for correcting laser output energy in atmospheric parameter inversion of the Mie scattering laser radar.
The energy monitoring module (5) can provide feedback signals for the LD controller (7), and can adjust LD power supply current according to the feedback signals under the condition that the output energy obviously changes when the laser works for a long time, so that the long-time stability of the output energy of the laser is improved.
The Q-switch driver (6) provides an operating voltage for the electro-optical Q-switch (23), and the operating voltage is 1/4λ high voltage.
The LD controller (7) provides the LD optical fiber pump source 1 (111) and the LD optical fiber pump source 2 (121) with the pump frequency and the pump pulse width regulated in the pulse pumping mode.
The LD controller (7) provides a synchronous clock signal for the Q-switch driver (6).
2. A high-stability high-energy solid state laser suitable for use in a rice scattering laser radar according to claim 1, characterized in that the pump coupling module (1) comprises a forward pump coupling module (11) and a backward pump coupling module (12); the forward pump coupling module (11) and the backward pump coupling module (12) have the same structure; the forward pumping coupling module (11) comprises an LD optical fiber pumping source 1 (111), a pumping source collimating lens 1 (112) and a pumping source focusing lens 1 (113); the backward pumping coupling module (12) comprises an LD optical fiber pump source 2 (121), a pump source collimating lens 2 (122) and a pump source focusing lens 2 (123); the pump source collimating lens 1 (112), the pump source focusing lens 1 (113), the pump source collimating lens 2 (122) and the pump source focusing lens 2 (123) are all plated with 808nm high-transmittance film layers;
the fundamental frequency oscillation module (2) comprises a laser medium (20), a Porro prism 1 (21), a 0.57 lambda wave plate (22), an electro-optical Q switch (23), a polaroid (24), a dichroic mirror 1 (25), a dichroic mirror 2 (26), a PBS (27), a 1/4 lambda wave plate (28) and a Porro prism 2 (29); the light transmission surfaces of the Porro prism 1 (21) and the Porro prism 2 (29) are plated with 1064nm high-transmittance film layers; the light transmission surfaces of the dichroic mirror 1 (25) and the dichroic mirror 2 (26) are plated with a film layer with 808nm high-transmission filter and 1064nm high reflectivity when placed at 45 degrees;
the frequency doubling module (3) comprises a fundamental frequency collimating lens (31), a fundamental frequency focusing lens (32) and a frequency doubling crystal (33); the fundamental frequency collimating lens (31) is plated with a 1064nm high-transmittance film layer; the fundamental frequency focusing lens (32) is plated with a 1064nm high-transmittance film layer; the frequency doubling crystal (33) is clamped in a heat sink to dissipate heat;
the laser beam splitting module (4) comprises a beam splitting mirror (41), a dichroic mirror 3 (42) and an optical collector (43); the beam splitter (41) is plated with a 532nm high-reflectivity film layer with 95% of the film layer penetrating through the filter film layer and 1064nm high reflectivity; the dichroic mirror 3 (42) is plated with a 532nm high-transmission filter film layer and a 1064nm high-reflectivity film layer;
the energy monitoring module (5) comprises an attenuation sheet (51), a narrow-band optical filter (52) and a photoelectric detector (53);
3. a high stability high energy solid state laser suitable for use in Mi scattering lidar according to claim 2, characterized in that the Baollo prism 1 (21) and the Poollo prism 2 (29) in the fundamental frequency oscillation module (2) constitute a resonant cavity of a quadrature Poollo prism structure.
4. A high stability high energy solid state laser suitable for use in Mie scattering lidar according to claim 2, characterized in that the 0.57 λ waveplate (22) compensates for the phase retardation of the Porro prism 1 (21); the combination of the Porro prism 1 (21) and the 0.57 lambda wave plate (22) is adopted to realize the high reflectivity of the total reflection surface of the Porro prism 1 (21) for fundamental frequency laser;
5. a high-stability high-energy solid-state laser suitable for use in a rice scattering lidar according to claim 2, characterized in that the electro-optical Q-switch (23) is operated in a back-off mode; the polaroid (24) is used for detecting the polarization of the working state of the electro-optical Q switch (23).
6. A high stability high energy solid state laser suitable for use in Mie scattering lidar according to claim 2, characterized in that the combination of the Porro prism 2 (29), 1/4 λ plate (28) and PBS (27) achieves polarization coupling out of fundamental frequency laser light; through the adjustment of the rotation angle of the 1/4 lambda wave plate (28), the continuous adjustment of the coupling output rate of the PBS (27) is realized.
7. A high stability high energy solid state laser suitable for use in a Mie Scattering laser radar according to claim 2, wherein the optical collector (43) is an inner tapered metal barrel, the inner tapered metal being oxidized to black for collecting 1064nm fundamental laser light while preventing 1064nm fundamental laser light from reflecting.
8. A high-stability high-energy solid laser suitable for Mie scattering lidar according to claim 2, characterized in that the focal spot of the LD fiber pump source 1 (111) is adjusted with a pump source collimating lens 1 (112) and a pump source focusing lens 1 (113); the focusing light spot of the LD optical fiber pump source 2 (121) is regulated by adopting a pump source collimating lens 2 (122) and a pump source focusing lens 2 (123); the focusing light spots of the LD optical fiber pump source 1 (111) and the LD optical fiber pump source 2 (121) are respectively positioned at the positions which are 1/3 of the length from the front end face and the rear end face of the laser medium (20).
9. A high-stability high-energy solid-state laser suitable for use in a rice scattering lidar according to claim 2, characterized in that the ridge of the boulder 1 (21) is placed at 45 ° to the horizontal; the ridge line of the Porro prism 2 (29) forms 90 degrees with the ridge line of the Porro prism 1 (21);
10. a high-stability high-energy solid laser suitable for use in a Mie scattering lidar according to claim 2, wherein the laser medium (20) is cut at 87 ° on both sides and coated with a 1064nm antireflection film; the other four sides of the laser medium (20) are plated with gold and indium is welded in a heat sink to dissipate heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210981640.XA CN116191187A (en) | 2022-08-16 | 2022-08-16 | High-stability high-energy solid laser suitable for meter scattering laser radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210981640.XA CN116191187A (en) | 2022-08-16 | 2022-08-16 | High-stability high-energy solid laser suitable for meter scattering laser radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116191187A true CN116191187A (en) | 2023-05-30 |
Family
ID=86438946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210981640.XA Pending CN116191187A (en) | 2022-08-16 | 2022-08-16 | High-stability high-energy solid laser suitable for meter scattering laser radar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116191187A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117650415A (en) * | 2023-10-20 | 2024-03-05 | 北京新光远望光电科技有限公司 | Passive Q-switched laser based on closed-loop control driving |
-
2022
- 2022-08-16 CN CN202210981640.XA patent/CN116191187A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117650415A (en) * | 2023-10-20 | 2024-03-05 | 北京新光远望光电科技有限公司 | Passive Q-switched laser based on closed-loop control driving |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110112642B (en) | Optical parametric oscillator | |
| CN111668691B (en) | Hundred picoseconds laser with high power and high repetition frequency | |
| CN109586153B (en) | Neodymium-doped lithium yttrium fluoride nanosecond pulse blue laser | |
| CN110571639B (en) | Nanosecond pulse narrow linewidth optical parametric oscillator for seed light injection | |
| CN116191187A (en) | High-stability high-energy solid laser suitable for meter scattering laser radar | |
| CN111180987B (en) | Orthogonal polarization dual-wavelength laser with adjustable power proportion | |
| CN113206429A (en) | Miniaturized solid laser | |
| CN210007100U (en) | kinds of optical parametric oscillator | |
| CN113054524A (en) | Time-sharing synthesized optical parametric oscillation device | |
| CN117039604A (en) | Double interference filter special angle composite feedback quantity adjustable semiconductor laser | |
| CN111416263A (en) | Terahertz source based on phosphorus germanium zinc crystal non-collinear phase matching difference frequency | |
| CN102354897A (en) | External secondary cascading difference frequency terahertz light source generation device and implementation method | |
| CN215989627U (en) | Miniaturized solid laser | |
| CN115084980A (en) | High-power nanosecond extra-cavity quintupling frequency laser | |
| CN114300921A (en) | Multi-wavelength pulse laser for atmospheric detection | |
| CN110932069B (en) | Ultrahigh repetition frequency narrow pulse single-wavelength alternate Q-switched laser output method and laser | |
| CN111313219A (en) | Double-mode pulse solid laser | |
| CN1243399C (en) | Ring laser device | |
| CN202308766U (en) | External twice-cascade-difference-frequency terahertz light source generator | |
| CN217934552U (en) | Nanosecond-picosecond combined laser | |
| CN217087125U (en) | Narrow pulse width laser with high repetition frequency and high beam quality | |
| CN112467509B (en) | Thermally stable laser for airborne ranging and irradiation | |
| CN2800595Y (en) | Tunable titanium sapphire laser capable of full solid-state quasi- continuous dual wavelength operation | |
| CN110768096A (en) | High-power and high-roundness industrial laser | |
| CN220401096U (en) | High-power single-frequency intracavity five-time frequency laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |