CN112652941A - High-energy, high-stability and high-reliability slab laser - Google Patents
High-energy, high-stability and high-reliability slab laser Download PDFInfo
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- CN112652941A CN112652941A CN202011534057.1A CN202011534057A CN112652941A CN 112652941 A CN112652941 A CN 112652941A CN 202011534057 A CN202011534057 A CN 202011534057A CN 112652941 A CN112652941 A CN 112652941A
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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
- 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
- H01S3/08004—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection
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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
- 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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/115—Q-switching using intracavity electro-optic devices
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Abstract
The invention provides a large-energy high-stability high-reliability slab laser which comprises a dove prism, a pyramid, a pumping source, a wave plate, an electro-optic Q-switched crystal, a first polarization beam splitter prism, a second polarization beam splitter prism, a first optical wedge, a second optical wedge, a first compensating lens, a second compensating lens and a pyramid compensating wave plate. The resonant cavity adopts a high-voltage variable wave plate coupling output mode, the integral cavity mirror adopts a dove prism and pyramid prism combined resonant cavity, and a small-angle double-optical-wedge high-precision rotary collimation resonant cavity is adopted in the cavity, so that the collimation of oscillation light in resonance can be realized; the integral structure debugging is simple, and at the resonant cavity of dove prism and pyramid prism combination, the device in the resonant cavity takes place deformation and aversion under adverse circumstances, does not influence the function of resonant cavity, and this resonant cavity has the auto-collimation effect, consequently has splendid anti mechanical vibration and anti high and low temperature environment and strikes, also can normally stable work under adverse conditions such as the temperature variation that has great shock wave, vibration and wide range.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a high-energy, high-stability and high-reliability slab laser.
Background
With the development of solid laser technology, large-energy solid lasers are widely applied in more and more fields, and put forward higher requirements on stability and reliability of lasers and environmental applicability in the fields of laser ranging, illumination, atmospheric detection and the like, and the design of the large-energy high-stability high-reliability lasers is particularly important, and meanwhile, the resonant cavity is used as a key element in the lasers, and the structure of the resonant cavity is concerned with the stability and reliability of laser output. The structural design of the resonator is reasonable and the stability and reliability for the laser are high.
The resonant cavity of the current laser generally adopts a combination of a cavity mirror flat mirror and a folding reflector and a quarter-wave plate coupling output mode. The stability of the plano-mirror resonant cavity is poor in some environments, and under complex environments, such as airborne vehicle-mounted conditions and the like, the laser is easy to detune, so that the laser is unstable in work and even does not work. Resulting in instability in the output of amplified energy.
Disclosure of Invention
The invention provides a high-energy, high-stability and high-reliability slab laser, aiming at solving the problem of reliability of a large-energy slab nanosecond laser and overcoming the problem of mechanical deformation of the laser under high and low temperature and impact vibration. The integral structure debugging is simple, and at the resonant cavity of dove prism and pyramid prism combination, the device in the resonant cavity takes place deformation and aversion under adverse circumstances, does not influence the function of resonant cavity, and this resonant cavity has the auto-collimation effect, consequently has splendid anti mechanical vibration and anti high and low temperature environment and strikes, also can normally stable work under adverse conditions such as the temperature variation that has great shock wave, vibration and wide range.
The invention provides a high-energy high-stability high-reliability slab laser, which comprises a dove prism and a pyramid which are arranged in parallel, and a pumping source and a laser output module which are arranged between the dove prism and the pyramid;
the front end face of the dove prism is used as a high reflection surface to form a self-consistent resonant cavity with a pyramid, a first optical arm and a second optical arm are formed between the dove prism and the pyramid, a pumping source is positioned on the first optical arm, and emergent light enters the second optical arm after passing through the dove prism or the pyramid;
the dove prism and the pyramid are used for performing optical path auto-collimation on emergent light of the pumping source so that the light on the first optical arm and the light on the second optical arm are kept parallel, the pumping source is used for generating laser and forming laser oscillation between the dove prism and the pyramid, and the laser emitting device is used for changing the polarization state of the oscillating light and outputting the oscillating light.
The invention relates to a large-energy high-stability high-reliability slab laser, which is used as a preferred mode, wherein a laser injection device comprises a wave plate, an electro-optic Q-switched crystal, a first polarization beam splitter prism and a second polarization beam splitter prism which are sequentially arranged on a second optical arm, wherein the wave plate is positioned between the dove prism and the electro-optic Q-switched crystal;
the laser injection device is used for changing the polarization state of the oscillation light in a high-voltage adjustable mode and outputting laser, the wave plate is used for adjusting the opening and closing state of the resonant cavity, the electro-optical Q-switching crystal is used for changing the polarization state of the oscillation light in the resonant cavity by applying adjustable high voltage, and the first polarization beam splitter prism and the second polarization beam splitter prism are used for separating the polarization state of the oscillation light and outputting laser.
According to the high-energy high-stability high-reliability slab laser, as a preferable mode, a first optical wedge used for adjusting device errors, first optical arm errors and second optical arm errors is arranged between a dove prism and a pumping source, and the first optical wedge is located on a first optical arm.
According to the high-energy high-stability high-reliability slab laser, as a preferred mode, a second optical wedge used for adjusting device errors, first optical arm errors and second optical arm errors is arranged between a dove prism and a wave plate, and the second optical wedge is located on a second optical arm;
the first wedge and the second wedge rotate in unison.
According to the high-energy high-stability high-reliability slab laser, as a preferred mode, the pyramid is made of quartz glass, the wave plate is a half wave plate, and the wedge angle of the first optical wedge and the second optical wedge is 0.5 degrees.
According to the high-energy high-stability high-reliability slab laser, as a preferable mode, a first compensation lens is arranged between the first optical wedge and the pumping source, and the first compensation lens is located on the first optical arm.
According to the high-energy high-stability high-reliability slab laser, as a preferable mode, a second compensation lens is arranged between a first optical wedge and a first compensation lens, and the second compensation lens is positioned on a first optical arm;
the second compensation lens is a cylindrical surface;
the first compensation lens and the second compensation lens are used for compensating the thermal focal length of the pump source and adjusting the divergence angle of the pump source, the first compensation lens is used for compensating the thermal focal length in the X direction, and the second compensation lens is used for compensating the thermal focal length in the Y direction.
According to the high-energy high-stability high-reliability slab laser, as a preferred mode, a pyramid compensation wave plate for compensating pyramid depolarization is arranged between the second polarization splitting prism and the pyramid, and the pyramid compensation wave plate is located on the second optical arm.
According to the high-energy high-stability high-reliability slab laser, as a preferable mode, the pumping source comprises a slab crystal and laser diodes arranged on two sides of the slab crystal.
The invention relates to a high-energy, high-stability and high-reliability slab laser, which is used as an optimal mode, wherein a pumping source is a zigzag footprint pump and is arranged in a pumping module of a quasi-continuous semiconductor laser module;
the slab crystal is made of Nd: YAG, lath crystal with angle distribution cutting and size of 6 × 153mm3A parallelogram crystal of (a);
the laser diode is a semiconductor diode with the emission wavelength of 806nm, the laser diode is arranged in a linear array with the light emitting point interval of 0.37mm, and the laser diode is matched with the light path reflection point of the slab crystal. A soft diaphragm is formed in a laser diode pumping area, a high-order mode in a resonant cavity is effectively inhibited, oscillating light is in a low-order mode, a slab crystal is Nd: YAG crystal in pump module of quasi-continuous semiconductor laser module, and the size of the laser crystal is cut at distributed angles, 6 × 153mm3。
The front end face of the dove prism is used as a high reflecting face and a pyramid to form a self-consistent stable resonant cavity, errors of all devices are compensated through rotating an optical wedge, a stable self-consistent closed-loop resonant cavity is formed, and the resonant cavity can keep self-consistent of a resonant cavity mirror under the condition that all the devices are deformed and deviated.
The output of the laser adopts a variable voltage coupling output mode, and the coupling output transmittance corresponding to the proper voltage can be selected according to the pumping power of the laser and the gain of the laser crystal. Maximum output efficiency is achieved.
The crystal adopts a parallelogram crystal, the end face is cut at an angle, the oscillation light is transmitted in the crystal according to a zigzag light path, and the mode matching of the pump light and the oscillation light is realized by a footprint pumping mode, so that the maximum extraction efficiency of the resonant cavity is realized.
The function of the compensation lens is to compensate the thermal focal length of the crystal while adjusting the divergence angle of the output laser light. The first compensation lens is for compensating the X direction, and the second compensation lens is for compensating the Y direction.
The low loss and high loss states are determined by the electro-optically Q-switched crystal: the output of the laser is the combination of the electro-optic Q-switched crystal and the wave plate, the polarization state is changed by adjusting the high voltage, the laser is output from the polarizing prism, the continuous change of the output rate can be realized by the change of the high voltage, and the optimal output transmission corresponding to the voltage value with the maximum output energy can be found;
the pyramid compensating wave plate compensates the depolarization of the pyramid prism. The compensation wave plate combination of the pyramid prism and the pyramid: after the polarized light passes through the pyramid prism, the polarization characteristic is reduced, a compensation wave plate is needed for compensation, the pyramid prism is made of quartz glass, and the compensation wave plate is a half wave plate.
The laser generation process comprises the following steps: the laser power supply supplies power to the laser diode light-emitting pump slab crystal, under the action of the whole resonant cavity, laser oscillation is generated in the resonant cavity, the wave plate 3 is adjusted to be in a resonant cavity door-closing state, and under the control of the high-voltage power supply, according to a certain frequency, the electro-optical Q-switch crystal applies proper high voltage, so that the resonant cavity door opening is realized, and laser oscillation is generated and output from the first polarization splitting prism.
The invention has the following advantages:
(1) the resonant cavity adopts a high-voltage variable wave plate coupling output mode, the integral cavity mirror adopts a dove prism and pyramid prism combined resonant cavity, and the small-angle double-optical-wedge high-precision rotary collimation resonant cavity is adopted in the cavity, so that the collimation of oscillation light in resonance can be realized.
(2) The invention has simple debugging of the whole structure, and in the resonant cavity formed by combining the dove prism and the pyramid prism, the device in the resonant cavity deforms and shifts under the severe environment without influencing the function of the resonant cavity.
(3) The resonant cavity of the invention has auto-collimation function, thus having excellent mechanical vibration resistance and high and low temperature environment impact resistance, and being capable of working normally and stably under severe conditions of larger shock wave, vibration, wide temperature change and the like.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment 1 of a high-energy, high-stability and high-reliability slab laser;
FIG. 2 is a schematic structural diagram of an embodiment 2 of a high-energy, high-stability and high-reliability slab laser.
Reference numerals:
1. a dove prism; 2. pyramid; 3. a pump source; 3a, a slab crystal; 3b, a laser diode; 4. a laser output module; 41. a wave plate; 42. an electro-optic Q-switched crystal; 43. a first polarization splitting prism; 44. a second polarization beam splitter prism; 5. a first optical wedge; 6. a second optical wedge; 7. a first compensation lens; 8. a second compensation lens; 9. the pyramid compensates the wave plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, a large-energy high-stability high-reliability slab laser includes a dove prism 1, a pyramid 2 arranged in parallel, a pump source 3 and a laser output module 4 arranged between the dove prism 1 and the pyramid 2;
the front end face of the dove prism 1 is used as a high reflection surface to form a self-consistent resonant cavity with the pyramid 2, a first optical arm and a second optical arm are formed between the dove prism 1 and the pyramid 2, the pumping source 3 is positioned on the first optical arm, and emergent light enters the second optical arm after passing through the dove prism 1 or the pyramid 2;
the dove prism 1 and the pyramid 2 are used for performing optical path auto-collimation on emergent light of the pump source 3 to enable light at the first optical arm and light at the second optical arm to be parallel, the pump source 3 is used for generating laser and forming laser oscillation between the dove prism 1 and the pyramid 2, and the laser emitting device 4 is used for changing the polarization state of the oscillation light and outputting the oscillation light.
Example 2
As shown in fig. 2, a large-energy high-stability high-reliability slab laser includes a dove prism 1 and a pyramid 2 arranged in parallel, a pump source 3 and a laser output module 4 arranged between the dove prism 1 and the pyramid 2;
the front end face of the dove prism 1 is used as a high reflection surface to form a self-consistent resonant cavity with the pyramid 2, a first optical arm and a second optical arm are formed between the dove prism 1 and the pyramid 2, the pumping source 3 is positioned on the first optical arm, and emergent light enters the second optical arm after passing through the dove prism 1 or the pyramid 2;
the dove prism 1 and the pyramid 2 are used for carrying out light path auto-collimation on emergent light of the pump source 3 so as to enable the light positioned on the first optical arm and the light positioned on the second optical arm to be parallel, the pump source 3 is used for generating laser and forming laser oscillation between the dove prism 1 and the pyramid 2, and the laser emitting device 4 is used for changing the polarization state of the oscillation light and outputting the oscillation light;
the pump source 3 includes a slab crystal 3a and laser diodes 3b disposed on both sides of the slab crystal 3 a;
the pumping source 3 is a zigzag footprint pump, and the pumping source 3 is arranged in a pumping module of the quasi-continuous semiconductor laser module;
the material of the slab crystal 3a is Nd: YAG, lath crystal 3a with angle distribution and cutting size of 6 × 153mm3A parallelogram crystal of (a);
the laser diode 3b is a semiconductor diode with the emission wavelength of 806nm, the laser diode 3b is a linear array arrangement with the light emitting point interval of 0.37mm, and the laser diode 3b is matched with the light path reflection point of the slab crystal 3 a;
the laser emitting device 4 comprises a wave plate 41, an electro-optical Q-switched crystal 42, a first polarization beam splitter prism 43 and a second polarization beam splitter prism 44 which are sequentially arranged on the second optical arm, wherein the wave plate 41 is positioned between the dove prism 1 and the electro-optical Q-switched crystal 42;
the laser injection device 4 is used for changing the oscillation light polarization state by adjusting high voltage and outputting laser, the wave plate 41 is used for adjusting the resonant cavity on-off state, and the electro-optical Q-switching crystal 42 is used for changing the oscillation light polarization state in the resonant cavity by applying adjustable high voltage, and the first polarization beam splitter prism 43 and the second polarization beam splitter prism 44 are used for separating the oscillation light polarization state and outputting laser;
a first optical wedge 5 used for adjusting device errors, first optical arm errors and second optical arm errors is arranged between the dove prism 1 and the pumping source 3, and the first optical wedge 5 is positioned on the first optical arm;
a second optical wedge 6 for adjusting the device error, the first optical arm error and the second optical arm error is arranged between the dove prism 1 and the wave plate 41, and the second optical wedge 6 is positioned on the second optical arm;
the first wedge 5 and the second wedge 6 rotate in unison;
the pyramid 2 is made of quartz glass, the wave plate 41 is a half wave plate, and the wedge angle of the first wedge 5 and the second wedge 6 is 0.5 degree;
a first compensation lens 7 is arranged between the first optical wedge 5 and the pumping source 3, and the first compensation lens 7 is positioned on the first optical arm;
a second compensation lens 8 is arranged between the first optical wedge 5 and the first compensation lens 7, and the second compensation lens 8 is positioned on the first optical arm;
the second compensation lens 8 is a cylindrical surface;
the first compensation lens 7 and the second compensation lens 8 are used for compensating the thermal focal length of the pumping source 3 and adjusting the divergence angle of laser oscillation light, the first compensation lens 7 is used for compensating the thermal focal length in the X direction, and the second compensation lens 8 is used for compensating the thermal focal length in the Y direction;
a pyramid compensation wave plate 9 for compensating the depolarization of the pyramid 2 is arranged between the second polarization splitting prism 44 and the pyramid 2, and the pyramid compensation wave plate 9 is positioned on the second optical arm.
The laser generation process for examples 1-2 was: the laser generation process comprises the following steps: the laser power supply supplies power to the laser diode 3b to illuminate the pumping slab crystal 3a, laser oscillation is generated in the resonant cavity under the action of the whole resonant cavity, the electro-optical Q-switching crystal 42 applies proper high voltage according to a certain frequency under the control of the high-voltage power supply, and oscillation laser is output from the first polarization beam splitter prism 44.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A high-energy, high-stability and high-reliability slab laser is characterized in that: the laser comprises a dove prism (1) and a pyramid (2) which are arranged in parallel, and a pumping source (3) and a laser output module (4) which are arranged between the dove prism (1) and the pyramid (2);
the front end face of the dove prism (1) is used as a high reflection surface to form a self-consistent resonant cavity with the pyramid (2), a first optical arm and a second optical arm are formed between the dove prism (1) and the pyramid (2), the pumping source (3) is positioned on the first optical arm, and the emergent light enters the second optical arm after passing through the dove prism (1) or the pyramid (2);
the dove prism (1) and the pyramid (2) are used for performing optical path auto-collimation on the emergent light rays so as to enable the light rays on the first optical arm and the second optical arm to be parallel, the pump source (3) is used for generating laser light and forming laser oscillation between the dove prism (1) and the pyramid (2), and the laser emitting device (4) is used for changing the polarization state of the oscillating light and outputting the oscillating light.
2. A high-energy high-stability high-reliability slab laser according to claim 1, wherein: the laser emitting device (4) comprises a wave plate (41), an electro-optical Q-switching crystal (42), a first polarization beam splitter prism (43) and a second polarization beam splitter prism (44), which are sequentially arranged on the second optical arm, wherein the wave plate (41) is positioned between the dove prism (1) and the electro-optical Q-switching crystal (42);
laser jettison device (4) are used for the adjustable change of high pressure oscillation light polarization state and output laser, wave plate (41) are used for adjusting resonant cavity switch door state, electro-optic Q-switching crystal (42) are used for through applying adjustable high pressure, change the oscillation light polarization state in the resonant cavity, first polarization beam splitter prism (43) with second polarization beam splitter prism (44) are used for the separation of oscillation light polarization state and output laser.
3. A high-energy high-stability high-reliability slab laser according to claim 2, wherein: and a first optical wedge (5) used for adjusting the device error, the first optical arm error and the second optical arm error is arranged between the dove prism (1) and the pumping source (3), and the first optical wedge (5) is positioned on the first optical arm.
4. A high-energy high-stability high-reliability slab laser according to claim 3, wherein: a second optical wedge (6) used for adjusting the device error, the first optical arm error and the second optical arm error is arranged between the dove prism (1) and the wave plate (41), and the second optical wedge (6) is located on the second optical arm;
the first wedge (5) and the second wedge (6) rotate in unison.
5. A high-energy high-stability high-reliability slab laser according to claim 4, wherein: the pyramid (2) is made of quartz glass, the wave plate (41) is a half wave plate, and the wedge angle of the first wedge (5) and the second wedge (6) is 0.5 degree.
6. A high-energy high-stability high-reliability slab laser according to claim 4, wherein: a first compensation lens (7) is arranged between the first optical wedge (5) and the pumping source (3), and the first compensation lens (7) is located on the first optical arm.
7. A high energy, high stability, high reliability slab laser according to claim 6, wherein: a second compensation lens (8) is arranged between the first optical wedge (5) and the first compensation lens (7), and the second compensation lens (8) is positioned on the first optical arm;
the second compensation lens (8) is a cylindrical surface;
the first compensation lens (7) and the second compensation lens (8) are used for compensating the thermal focal length of the pump source (3) and adjusting the divergence angle of the pump source (3), the first compensation lens (7) is used for compensating the thermal focal length in the X direction, and the second compensation lens (8) is used for compensating the thermal focal length in the Y direction.
8. A high-energy high-stability high-reliability slab laser according to claim 2, wherein: a pyramid compensation wave plate (9) used for compensating the depolarization of the pyramid (2) is arranged between the second polarization splitting prism (44) and the pyramid (2), and the pyramid compensation wave plate (9) is positioned on the second optical arm.
9. A high-energy high-stability high-reliability slab laser according to any one of claims 1 to 7, characterized in that: the pump source (3) comprises a slab crystal (3a) and laser diodes (3b) arranged on both sides of the slab crystal (3 a).
10. A high-energy high-stability high-reliability slab laser according to claim 9, wherein: the pump source (3) is a zigzag footprint pump, and the pump source (3) is arranged in a pump module of the quasi-continuous semiconductor laser module;
the slab crystal (3a) is made of Nd: YAG, said lath crystals (3a) being angle-cut and having a size of 6 x 153mm3A parallelogram crystal of (a);
the laser diode (3b) is a semiconductor diode with an emission wavelength of 806nm, the laser diode (3b) is arranged in a linear array with a light emitting point interval of 0.37mm, and the laser diode (3b) is matched with a light path reflection point of the slab crystal (3 a).
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| CN202011534057.1A CN112652941A (en) | 2020-12-23 | 2020-12-23 | High-energy, high-stability and high-reliability slab laser |
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| CN202011534057.1A CN112652941A (en) | 2020-12-23 | 2020-12-23 | High-energy, high-stability and high-reliability slab laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113644536A (en) * | 2021-07-08 | 2021-11-12 | 北京遥测技术研究所 | High-vibration-resistance kilohertz miniaturized laser |
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| CN104104002A (en) * | 2014-07-30 | 2014-10-15 | 中国船舶重工集团公司第七一七研究所 | Imbalance-resistant solid laser |
| CN105486278A (en) * | 2015-12-21 | 2016-04-13 | 西安西光威信光电有限公司 | Visual optical instrument |
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| US20050007596A1 (en) * | 2003-07-11 | 2005-01-13 | Wilks Enterprise, Inc. | Apparatus and method for increasing the sensitivity of in-line infrared sensors |
| CN103730825A (en) * | 2014-01-03 | 2014-04-16 | 中国航空工业集团公司北京航空制造工程研究所 | Adjustment-free cavity-length-variable laser device |
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| CN113644536A (en) * | 2021-07-08 | 2021-11-12 | 北京遥测技术研究所 | High-vibration-resistance kilohertz miniaturized laser |
| CN113644536B (en) * | 2021-07-08 | 2023-03-03 | 北京遥测技术研究所 | High-vibration-resistance kilohertz miniaturized laser |
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Application publication date: 20210413 |