CN116667139A - Pulse laser without temperature control beam splitting amplification - Google Patents
Pulse laser without temperature control beam splitting amplification Download PDFInfo
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- CN116667139A CN116667139A CN202310665119.XA CN202310665119A CN116667139A CN 116667139 A CN116667139 A CN 116667139A CN 202310665119 A CN202310665119 A CN 202310665119A CN 116667139 A CN116667139 A CN 116667139A
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- 230000003321 amplification Effects 0.000 title claims abstract description 112
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 112
- 238000005086 pumping Methods 0.000 claims abstract description 36
- 230000010287 polarization Effects 0.000 claims abstract description 21
- 230000003449 preventive effect Effects 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 claims description 32
- 238000003491 array Methods 0.000 claims description 26
- 230000002265 prevention Effects 0.000 claims description 9
- 239000010453 quartz Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 230000003667 anti-reflective effect Effects 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 2
- 230000009862 primary prevention Effects 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 description 6
- 230000003071 parasitic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/041—Optical pumping
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- 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
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0071—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for beam steering, e.g. using a mirror outside the cavity to change the beam direction
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- 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
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/1092—Multi-wavelength lasing
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- 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
- H01S5/00—Semiconductor lasers
- H01S5/50—Amplifier structures not provided for in groups H01S5/02 - H01S5/30
- H01S5/5027—Concatenated amplifiers, i.e. amplifiers in series or cascaded
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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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- General Physics & Mathematics (AREA)
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- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention provides a pulse laser without temperature control beam splitting and amplifying, which comprises: the system comprises a local oscillator stage system, a primary pre-amplification system and a secondary beam splitting amplification system, wherein the local oscillator stage system adopts a multi-wavelength pumping mode to generate seed laser and output the seed laser; along the transmission direction of light, the first-stage pre-amplification system is positioned at the downstream of the local oscillation stage system, the second-stage beam splitting amplification system is positioned at the downstream of the first-stage pre-amplification system, and seed laser outputs large preventive laser after double-pass large preventive treatment is performed by the first-stage large preventive treatment system. The secondary beam splitting and amplifying system splits the pre-amplified laser into two sub-lasers, respectively performs secondary double-pass amplification on the two sub-lasers, and then realizes pulse laser output through polarization beam combination. The pulse laser without temperature control beam splitting amplification has the advantages of high system reliability, good beam quality and small volume, and can realize laser output with high pulse energy and high beam quality without temperature control at normal temperature.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a pulse laser without temperature control beam splitting amplification.
Background
The LD pumped pulse laser has the characteristics of high conversion efficiency, high peak power, high beam quality and the like, wherein the large pulse energy solid laser has wide development prospect and application field in the fields of space detection, illumination and laser processing. However, such high pulse energy solid state lasers generally require a huge water or air cooling system to cooperate, which causes problems such as huge overall system and complex structure.
The adjacent multi-wavelength pumping can ensure that the laser crystal can still absorb enough pumping light under the condition of internal temperature change, and the influence caused by temperature drift can be avoided to a great extent although certain pumping efficiency is sacrificed. Meanwhile, an amplification structure of beam splitting and amplification is adopted, and after beam splitting, laser amplification can prevent high damage rate of devices caused by high power density and can avoid stability reduction caused by parasitic oscillation caused by high gain required by multistage amplification.
Disclosure of Invention
The invention aims to solve the technical problem of how to design a pulse laser without temperature control and stable output, and provides a pulse laser without temperature control beam splitting and amplifying.
According to an embodiment of the invention, a pulse laser without temperature control beam splitting amplification comprises:
the local oscillator stage system adopts a multi-wavelength pumping mode to generate seed laser and outputs the seed laser;
the first-stage pre-amplification system is positioned at the downstream of the local oscillator stage system along the transmission direction of light, and the seed laser outputs large preventive laser after the large preventive system performs double-pass prevention;
the secondary beam splitting and amplifying system is positioned at the downstream of the primary pre-amplifying system along the light transmission direction, splits the pre-amplified laser into two beams of sub-lasers, respectively performs secondary double-pass amplification on the two beams of sub-lasers, and then realizes pulse laser output through polarization beam combination.
According to some embodiments of the invention, the local oscillator stage system comprises: the device comprises a total reflecting mirror, an electro-optical Q module, an oscillating stage polaroid, an oscillating stage 1/4 wave plate, a first oscillating stage pump module, a 90-degree quartz rotor, a second oscillating stage pump module, an output mirror, a reflecting mirror and an isolator.
In some embodiments of the present invention, the output mirror is a plano-convex mirror, and forms a laser resonant cavity with the total reflection mirror, the convex surface of the output mirror faces into the cavity of the laser resonant cavity, the convex surface of the output mirror is plated with a 1064nm semi-reflective semi-transparent film, and the plane of the output mirror is plated with a 1064nm anti-reflective film.
According to some embodiments of the invention, the first stage pre-amplification system comprises: the device comprises a pre-amplification stage 1/2 wave plate, a pre-amplification stage negative lens, a pre-amplification stage polaroid, a pre-amplification stage pumping module, a pre-amplification stage 1/4 wave plate, a prevention large-scale reflector and a pre-amplification stage isolator.
In some embodiments of the invention, the two-stage beam-splitting amplification system comprises: the optical fiber comprises a first 1/2 wave plate, a spectroscope, a first amplifying negative lens, a first amplifying polaroid, a second amplifying negative lens, a second amplifying polaroid, a first amplifying pump module, a second 1/2 wave plate, a first 1/4 wave plate, a first total reflecting mirror, a second 1/4 wave plate, a second total reflecting mirror and a polarization beam splitter prism.
According to some embodiments of the present invention, the pumping modules of the local oscillator stage system, the primary preventive big system and the secondary beam-splitting amplifying system each include a plurality of LD arrays, and each LD array includes a plurality of LD arrays emitting different wavelengths.
In some embodiments of the present invention, the pump module includes four sets of LD arrays, each set of LD arrays comprising three LD arrays emitting at wavelengths of 802nm, 808nm, and 814nm, respectively.
According to some embodiments of the invention, the laser crystal in the pump module is a gain medium of a laser, for absorbing pump light and generating laser output, the host material is YAG, YAP crystal, glass or ceramic, and the doped ion is nd3+ or yb3+.
In some embodiments of the invention, the laser crystal is a rod-shaped laser crystal with two end faces cut at an angle of 1 °.
According to some embodiments of the invention, the plurality of sets of LD arrays are uniformly spaced around the laser crystal radially outward of the laser crystal.
The invention has the following beneficial effects:
the pulse laser without temperature control beam splitting amplification disclosed by the invention has the advantages of high system reliability, good beam quality and small volume, and can realize laser output with high pulse energy and high beam quality without temperature control at normal temperature. The invention adopts the technical scheme of adjacent multi-wavelength pumping, can ensure that the laser crystal can still absorb enough pumping light under the condition of internal temperature change, and can avoid the influence caused by temperature drift to a great extent although certain pumping efficiency is sacrificed. Meanwhile, an amplification structure of beam splitting and amplification is adopted, and after beam splitting, laser amplification can prevent high damage rate of devices caused by high power density and can avoid stability reduction caused by parasitic oscillation caused by high gain required by multistage amplification.
Drawings
FIG. 1 is a schematic diagram of a pulse laser without temperature control beam splitting amplification according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a multi-wavelength annular pump structure according to an embodiment of the present invention.
Reference numerals:
the device comprises a total reflecting mirror 1, an electro-optical Q module 2, an oscillating stage polaroid 3, an oscillating stage 1/4 wave plate 4, a first oscillating stage pump module 5, a 90-degree quartz rotor 6, a second oscillating stage pump module 7, an output mirror 8, a reflecting mirror 9 and an isolator 10;
a pre-amplification stage 1/2 wave plate 30, a pre-amplification stage negative lens 11, a pre-amplification stage polaroid 12, a pre-amplification stage pump module 13, a pre-amplification stage 1/4 wave plate 14, a prevention large-scale reflector 15 and a pre-amplification stage isolator 16;
the optical fiber comprises a first 1/2 wave plate 31, a spectroscope 17, a first amplifying negative lens 18, a first amplifying polarizer 19, a second amplifying negative lens 20, a second amplifying polarizer 21, a first amplifying pump module 22, a second amplifying pump module 23, a second 1/2 wave plate 24, a first 1/4 wave plate 25, a first total reflection mirror 26, a second 1/4 wave plate 27, a second total reflection mirror 28 and a polarization splitting prism 29;
base 32, substrate 33, laser crystal 34, 802nmLD array 35, 808nmLD array 36, 814nmLD array 37.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description of the present invention is given with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 1, a pulse laser without temperature control beam splitting amplification according to an embodiment of the present invention includes: the system comprises a local oscillator stage system, a primary pre-amplification system and a secondary beam splitting amplification system.
The local oscillator stage system adopts a multi-wavelength pumping mode to generate seed laser and output the seed laser. For example, the local oscillator stage system may employ a plurality of LD array pump laser crystals emitting different wavelengths. It can be understood that the laser with different wavelengths has different optimal absorption temperatures, and the pulse laser provided by the invention cannot accurately control the temperature because the temperature control system is not arranged, and the temperature drift effect caused by temperature change can be compensated by adopting a multi-wavelength pumping mode with different wavelengths.
Along the transmission direction of light, the first-stage pre-amplification system is positioned at the downstream of the local oscillation stage system, the second-stage beam splitting amplification system is positioned at the downstream of the first-stage pre-amplification system, and seed laser outputs large preventive laser after double-pass large preventive treatment is performed by the first-stage large preventive treatment system. The secondary beam splitting and amplifying system splits the pre-amplified laser into two sub-lasers, respectively performs secondary double-pass amplification on the two sub-lasers, and then realizes pulse laser output through polarization beam combination.
The pulse laser without temperature control beam splitting amplification has the advantages of high system reliability, good beam quality and small volume, and can realize laser output with high pulse energy and high beam quality without temperature control at normal temperature. The invention adopts the technical scheme of adjacent multi-wavelength pumping, can ensure that the laser crystal 34 can still absorb enough pumping light under the condition of internal temperature change, and can avoid the influence caused by temperature drift to a great extent although certain pumping efficiency is sacrificed. Meanwhile, an amplification structure of beam splitting and amplification is adopted, and after beam splitting, laser amplification can prevent high damage rate of devices caused by high power density and can avoid stability reduction caused by parasitic oscillation caused by high gain required by multistage amplification.
According to some embodiments of the invention, as shown in fig. 1, a local oscillator stage system includes: the full-reflection mirror 1, the electro-optical Q module 2, the oscillating stage polaroid 3, the oscillating stage 1/4 wave plate 4, the first oscillating stage pumping module 5, the 90-degree quartz rotor 6, the second oscillating stage pumping module 7, the output mirror 8, the reflecting mirror 9 and the isolator 10.
It should be noted that, the electro-optical Q module 2, the oscillating-stage polarizer 3, and the oscillating-stage 1/4 wave plate 4 form an electro-optical Q modulation module, the pumping module adopts a double-rod serial connection mode, and outputs seed laser with narrow pulse width and high beam quality through the electro-optical Q modulation technology, and enters the subsequent system through the isolator 10 after passing through the reflector 9.
In some embodiments of the present invention, as shown in fig. 1, the output mirror 8 is a plano-convex mirror, and forms a laser resonator with the total reflection mirror 1, the convex surface of the output mirror 8 faces into the cavity of the laser resonator, the convex surface of the output mirror 8 is plated with a 1064nm semi-reflective semi-transparent film, and the plane of the output mirror 8 is plated with a 1064nm anti-reflective film.
The convex surface of the output mirror 8 is arranged towards the cavity, so that the thermal lens effect of the laser crystal can be directly compensated, negative lens compensation is not needed to be inserted into the cavity, and therefore, the components of the pulse laser are simplified, and the volume of the pulse laser is reduced.
According to some embodiments of the invention, as shown in fig. 1, a primary pre-amplification system includes: a pre-amplification stage 1/2 wave plate 30, a pre-amplification stage negative lens 11, a pre-amplification stage polarizer 12, a pre-amplification stage pump module 13, a pre-amplification stage 1/4 wave plate 14, a prevention large mirror 15 and a pre-amplification stage isolator 16.
It should be noted that, the seed laser output by the local oscillation stage system enters the first-stage pre-amplification system, the direction of the linearly polarized light is improved through the pre-amplification stage 1/2 wave plate 30, the linearly polarized light is compensated through the pre-amplification stage negative lens 11, the light path is not deflected after passing through the pre-amplification stage polarizing plate 12, then passes through the pre-amplification stage pumping module 13, passes through the pre-amplification stage 1/4 wave plate 14 after first amplification, then passes through the pre-amplification stage 1/4 wave plate 14 and the pre-amplification stage pumping module 13 after being reflected by the prevention large-stage reflecting mirror 15, and enters the subsequent system after being reflected by the prevention large-stage isolator 16.
In some embodiments of the invention, a two-stage beam splitting amplification system comprises: the first 1/2 wave plate 31, the spectroscope 17, the first amplifying negative lens 18, the first amplifying polarizer 19, the second amplifying negative lens 20, the second amplifying polarizer 21, the first amplifying pump module 22, the second amplifying pump module 23, the second 1/2 wave plate 24, the first 1/4 wave plate 25, the first total reflection mirror 26, the second 1/4 wave plate 27, the second total reflection mirror 28 and the polarization splitting prism 29.
It should be noted that, the preamplified laser output by the first preamplified system enters the second-stage beam splitting amplifying system, the direction of the linearly polarized light is improved by the first 1/2 wave plate 31, the beam path is divided into two paths by the beam splitter 17, the single-path laser passes through the first amplifying negative lens 18, passes through the second amplifying pumping module 23 to amplify for the first time, passes through the first 1/4 wave plate 25, then passes through the first 1/4 wave plate 25 again after being reflected by the first total reflecting mirror 26, passes through the second amplifying pumping module 23 to amplify for the second time, and then passes through the first amplifying polarizing plate 19 to reflect, and then passes through the second 1/2 wave plate 24 to change the p-direction polarizing direction into s-direction polarizing.
The other laser beam is compensated by the second amplifying negative lens 20, then enters the first amplifying pump module 22 for amplifying after being not deflected by the second amplifying polarizer 21, then passes through the second 1/4 wave plate 27, the second total reflection mirror 28 and the second 1/4 wave plate 27 in sequence, changes the polarization direction into the p direction, and then is amplified for the second time by the first amplifying pump module 22, and the p-direction polarized light is reflected by the second amplifying polarizer 21. One of the two laser beams is polarized in the s direction, the other laser beam is polarized in the p direction, and polarization beam combination is carried out in a Polarization Beam Splitter (PBS) 29 to synthesize one circularly polarized light so as to realize pulse laser output. The two light beams are polarized and combined in a Polarization Beam Splitter (PBS) 29 to obtain laser with large pulse energy.
According to some embodiments of the present invention, as shown in fig. 2, the pumping modules of the local oscillator stage system, the primary prevention large system and the secondary beam-splitting amplification system each include a plurality of LD arrays, each of which includes a plurality of LD arrays emitting different wavelengths.
In some embodiments of the present invention, as shown in FIG. 2, the pump module includes four sets of LD arrays, each set of LD arrays comprising three 802nm LD arrays 35, 808nm and 814nm emission wavelengths, respectively, 802nm, 808nm and 814nm LD arrays 36, 814nm LD arrays 37.
According to some embodiments of the present invention, as shown in fig. 2, the laser crystal 34 in the pump module is a gain medium of a laser for absorbing pump light and generating laser output, the matrix 33 material is YAG, YAP crystal, glass or ceramic, and the doped ions are nd3+ or yb3+.
In some embodiments of the present invention, the laser crystal 34 is a rod-shaped laser crystal 34 with both end faces cut at 1 °.
According to some embodiments of the present invention, the plurality of sets of LD arrays are uniformly spaced around the laser crystal 34 radially outward of the laser crystal 34. As shown in fig. 2, a plurality of sets of LD arrays are uniformly spaced apart on the base 32.
The pulse laser without temperature control beam splitting amplification of the present invention is described in detail in a specific embodiment with reference to the accompanying drawings. It should be noted that the following description is only exemplary and should not be construed as limiting the invention in any way.
The embodiment provides a pulse laser without temperature control beam splitting amplification, which has the characteristics of high reliability and small volume, and can realize stable output of high-beam quality laser with pulse energy of more than 200mJ at the repetition frequency of 10Hz under normal temperature and no temperature control.
As shown in fig. 1, the pulse laser without temperature control beam splitting amplification comprises: the system comprises a local oscillator stage system, a primary pre-amplification system and a secondary beam splitting amplification system.
The pumping modules all adopt LD arrays to carry out side annular pumping, as shown in figure 2, and comprise 802nm LD arrays 35, 808nm LD arrays 36 and 814nm LD arrays 37, and can output mixed lasers with three different center wavelengths of 802nm, 808nm and 814nm so as to compensate the temperature drift effect caused by temperature change. There are 4 arrays of different wavelengths each, fixed to the base 32.
Each array contains 12 bars, each bar can emit 200W laser light, and side pumping is performed on the laser crystal 34. In the first oscillating stage pump module 5 and the second oscillating stage pump module 7, the laser crystal 34 adopts an Nd-YAG crystal rod with the length of 40mm and the doping concentration of 0.8 percent. In the pre-amplification stage pump module 13, the first amplification pump module 22 and the second amplification pump module 23, the laser crystal 34 adopts Nd with a length of 40mm and a doping concentration of 0.6%: YAG crystal rod. The crystal rods in the pumping modules are all provided with a 1-degree chamfer angle so as to prevent the phenomenon of self-excitation.
As shown in fig. 1, the local oscillation stage system comprises a total reflecting mirror 1, an electro-optical Q module 2, an oscillation stage polarizer 3, a wave plate oscillation stage 1/4 wave plate 4, a first oscillation stage pumping module 5, a 90-degree quartz rotor 6, a second oscillation stage pumping module 7, an output mirror 8, a reflecting mirror 9 and an isolator 10. The total reflection mirror 1 and the output mirror 8 form a resonant cavity, wherein the total reflection mirror 1 is a flat mirror, the output mirror 8 is a flat convex mirror, the convex surface is directed towards the cavity to directly compensate the thermal lens effect of the laser crystal 34, negative lens compensation is not required to be inserted into the cavity, and the curvature radius is usually 2 times of the focal length of the thermal lens. And when the high voltage is not loaded on the KD-P crystal, the cavity cannot oscillate, the upper energy level particle number is accumulated, and when the high voltage is loaded on the electro-optical Q module 2, the cavity rapidly builds oscillation to output pulse light. The output pulse is controlled within 20ns after Q modulation. The isolator 10 prevents back light and protects the optics in the oscillating stage system.
The first-stage pre-amplification system comprises: a pre-amplification stage 1/2 wave plate 30, a pre-amplification stage negative lens 11, a pre-amplification stage polaroid 12, a pre-amplification stage pump module 13, a pre-amplification stage 1/4 wave plate 14, a prevention large-scale reflector 15 and a pre-amplification stage isolator 16. Since the polarization direction of the linearly polarized light is deflected by 45 degrees after passing through the isolator 10, the pre-amplification stage 1/2 wave plate 30 corrects the polarized light to be p-direction, and the pre-amplification stage negative lens 11 compensates laser light, so that the influence of a thermal lens effect is reduced. After passing through the pre-amplification stage pumping module 13, the laser passes through the pre-amplification stage 1/4 wave plate 14, and meanwhile, the light beam reflected by the large-scale preventing reflecting mirror 15 passes through the pre-amplification stage 1/4 wave plate 14 again, and the polarization direction is changed into the s direction. The pre-amplification stage polarizer 12 reflects the s-polarized laser light to the pre-amplification stage isolator 16, and the pre-amplification stage isolator 16 prevents back light, thereby protecting the pre-optics in the primary pre-amplification system.
The secondary beam splitting and amplifying system comprises: the first 1/2 wave plate 31, the spectroscope 17, the first amplifying negative lens 18, the first amplifying polarizer 19, the second amplifying negative lens 20, the second amplifying polarizer 21, the first amplifying pump module 22, the second amplifying pump module 23, the second 1/2 wave plate 24, the first 1/4 wave plate 25, the first total reflection mirror 26, the second 1/4 wave plate 27, the second total reflection mirror 28, and the polarization splitting Prism (PBS) 29. Since the polarization direction of the linearly polarized light is deflected by 45 ° after passing through the pre-amplification stage isolator 16, the first 1/2 wave plate 31 corrects the polarized light into s direction, the beam splitter 17 divides the laser beam into two beams of laser beams, each beam of laser beam passes through an amplifying system with similar structure, the laser beam is compensated by passing through the first amplifying negative lens 18 respectively, then enters the second amplifying pump module 23 for amplification after passing through the first amplifying polarizer 19 and not deflected, then passes through the first 1/4 wave plate 25, the first total reflecting mirror 26, the first 1/4 wave plate 25, changes the polarization direction into p direction, then carries out secondary amplification through the second amplifying pump module 23, reflects the p-direction polarized light through the first amplifying polarizer 19, and changes the p-direction polarization direction into s-direction polarization through the second 1/2 wave plate 24. The other laser beam is compensated by the second amplifying negative lens 20, is not deflected by the second amplifying polarizer 21 and enters the first amplifying pump module 22 for amplifying, is changed into p-direction by the second 1/2 wave plate 24, the second total reflection mirror 28 and the second 1/4 wave plate 27, is secondarily amplified by the first amplifying pump module 22, and reflects the p-direction polarized light by the second amplifying polarizer 21. One of the two laser beams is polarized in the s direction, the other laser beam is polarized in the p direction, and polarization beam combination is carried out in a Polarization Beam Splitter (PBS) 29 to synthesize one circularly polarized light so as to realize pulse laser output.
The preamplification stage 1/4 wave plate 14, the second 1/2 wave plate 24, the first 1/4 wave plate 25, the second 1/4 wave plate 27, the preamplification stage 1/2 wave plate 30 and the first 1/2 wave plate 31 are all plated with 1064nm antireflection films.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that these drawings are included in the spirit and scope of the invention, it is not to be limited thereto.
Claims (10)
1. A pulsed laser without temperature controlled beam splitting amplification, comprising:
the local oscillator stage system adopts a multi-wavelength pumping mode to generate seed laser and outputs the seed laser;
the first-stage pre-amplification system is positioned at the downstream of the local oscillator stage system along the transmission direction of light, and the seed laser outputs large preventive laser after the large preventive system performs double-pass prevention;
the secondary beam splitting and amplifying system is positioned at the downstream of the primary pre-amplifying system along the light transmission direction, splits the pre-amplified laser into two beams of sub-lasers, respectively performs secondary double-pass amplification on the two beams of sub-lasers, and then realizes pulse laser output through polarization beam combination.
2. The pulse laser without temperature controlled beam splitting amplification of claim 1, wherein the local oscillator stage system comprises: the device comprises a total reflecting mirror, an electro-optical Q module, an oscillating stage polaroid, an oscillating stage 1/4 wave plate, a first oscillating stage pump module, a 90-degree quartz rotor, a second oscillating stage pump module, an output mirror, a reflecting mirror and an isolator.
3. The pulse laser without temperature control beam splitting and amplifying according to claim 2, wherein the output mirror is a plano-convex mirror, a laser resonant cavity is formed by the output mirror and the total reflection mirror, the convex surface of the output mirror faces into the cavity of the laser resonant cavity, the convex surface of the output mirror is plated with a 1064nm semi-reflective semi-transparent film, and the plane of the output mirror is plated with a 1064nm anti-reflective film.
4. The pulse laser without temperature controlled beam splitting amplification of claim 1, wherein the primary pre-amplification system comprises: the device comprises a pre-amplification stage 1/2 wave plate, a pre-amplification stage negative lens, a pre-amplification stage polaroid, a pre-amplification stage pumping module, a pre-amplification stage 1/4 wave plate, a prevention large-scale reflector and a pre-amplification stage isolator.
5. The pulse laser without temperature controlled beam splitting amplification of claim 1, wherein the secondary beam splitting amplification system comprises: the optical fiber comprises a first 1/2 wave plate, a spectroscope, a second-stage amplifying negative lens, a first amplifying polaroid, a second amplifying negative lens, a second amplifying polaroid, a first amplifying pump module, a second 1/2 wave plate, a first 1/4 wave plate, a first total reflecting mirror, a second 1/4 wave plate, a second total reflecting mirror and a polarization splitting prism.
6. The pulse laser without temperature controlled beam splitting amplification according to any one of claims 1 to 5, wherein the pumping modules of the local oscillator stage system, the primary prevention stage system and the secondary beam splitting amplification system each comprise a plurality of LD arrays, each LD array comprising a plurality of LD arrays emitting different wavelengths.
7. The pulse laser without temperature controlled beam splitting amplification of claim 6, wherein the pumping module comprises four sets of LD arrays, each set of LD arrays comprising three LD arrays with emission wavelengths of 802nm, 808nm, and 814nm, respectively.
8. The pulse laser without temperature control beam splitting and amplifying according to claim 6, wherein the laser crystal in the pumping module is a gain medium of the laser, and is used for absorbing pumping light and generating laser output, the matrix material is YAG, YAP crystal, glass or ceramic, and the doped ion is nd3+ or yb3+.
9. The pulse laser device without temperature control beam splitting and amplifying according to claim 8, wherein said laser crystal is a rod-shaped laser crystal with two end faces cut at an angle of 1 °.
10. The pulse laser without temperature controlled beam splitting amplification according to claim 9, wherein a plurality of sets of LD arrays are uniformly spaced around the laser crystal radially outward of the laser crystal.
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| CN202310665119.XA CN116667139A (en) | 2023-06-06 | 2023-06-06 | Pulse laser without temperature control beam splitting amplification |
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| CN202310665119.XA CN116667139A (en) | 2023-06-06 | 2023-06-06 | Pulse laser without temperature control beam splitting amplification |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117673880A (en) * | 2024-01-31 | 2024-03-08 | 北京卓镭激光技术有限公司 | Nanosecond pulse laser with double-path energy amplification |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117673880A (en) * | 2024-01-31 | 2024-03-08 | 北京卓镭激光技术有限公司 | Nanosecond pulse laser with double-path energy amplification |
| CN117673880B (en) * | 2024-01-31 | 2024-04-30 | 北京卓镭激光技术有限公司 | Nanosecond pulse laser with double-path energy amplification |
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