CN110943366A - Dual-wavelength alternating Q-switching output group pulse laser and laser output method - Google Patents
Dual-wavelength alternating Q-switching output group pulse laser and laser output method Download PDFInfo
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- CN110943366A CN110943366A CN201910386967.0A CN201910386967A CN110943366A CN 110943366 A CN110943366 A CN 110943366A CN 201910386967 A CN201910386967 A CN 201910386967A CN 110943366 A CN110943366 A CN 110943366A
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using 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
- 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
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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 discloses a dual-wavelength alternate Q-switching output group pulse laser and a laser output method, wherein the laser comprises: the first pump source is connected with the first coupling lens group through a first optical fiber and used for providing pump light for the first laser gain medium; the second pump source is connected to the second coupling lens group through a second optical fiber and used for providing pump light for the second laser gain medium; the laser resonator comprises a laser holophote, an electro-optic Q-switched crystal, a polarizer, a first 45-degree reflector, a first wedge prism, a first right-angle prism group, a first laser gain medium and a first laser output mirror; the laser total reflector, the electro-optic Q-switched crystal, the polarizer, the first 45-degree reflector, the second 45-degree reflector, the quarter-wave plate, the second wedge prism, the second right-angle prism group, the second laser gain medium and the second laser output mirror form a second path of laser resonant cavity.
Description
Technical Field
The invention relates to the field of solid lasers, in particular to a dual-wavelength alternate Q-switching output group pulse laser and a laser output method.
Background
The high repetition frequency dual-wavelength laser has important application value in the fields of remote laser ranging, laser medical treatment, photoelectric countermeasure, laser communication, laser radar and the like. The existing common Q-switched dual-wavelength pulse laser outputs simultaneously, and all pulses are at equal time intervals; secondly, most of dual-wavelength lasers adopt a single laser gain medium to obtain the simultaneous output of the dual-wavelength laser, when the lasers with two wavelengths are generated in the same gain medium, the transition spectral lines have strong gain competition, and the stability of the laser output is further influenced; moreover, the precise design of the transmittance of the output mirror is used to ensure that the lasers with two wavelengths have the same threshold value, which brings great challenges to the film system of the output mirror; in addition, obtaining laser output with high repetition frequency inevitably brings thermal lens effect to the laser, and then influences the output quality of laser beam, makes the laser deviate from stable working state.
The presently disclosed dual wavelength alternate Q-switched output burst laser is relatively scarce in its related art. As shown in fig. 1, in a prior patent with application No. 201310622452.9 related to the present invention, the structure adopted mainly includes a semiconductor pump source 101, a first aspheric lens 102, a second aspheric lens 103, a laser front cavity mirror 104, a laser crystal 105, a Q-switch 106, a laser output mirror 107, a polarizer 108, an isolator 109, a λ/2 wave plate 110, a polarizer 111, a pockels cell 112, and a laser total reflection mirror 113. However, the known technology has the following four disadvantages: firstly, when the laser operates under the condition of large injection and high repetition frequency, because a single gain medium is adopted for working, the thermal load of the laser is too heavy, and a very serious thermal lens effect can be brought, so that the quality of a light beam is reduced, and the output energy of a single pulse is also limited; secondly, the obtained pulse train has single wavelength and small application range; thirdly, a pulse sequence regulating device is adopted to obtain a pulse sequence, so that the system is large in size; and fourthly, the Pockels cell phase modulation is adopted, a matched power supply is required to be used for driving, and the structure is complex.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a dual-wavelength alternate Q-switched output group pulse laser and a laser output method. The invention adopts a mode of pumping double laser gain media by low repetition frequency wide pulse to realize the dual-wavelength alternate output of the burst pulse, and the intermittent oscillation technology of the burst pulse laser can relieve the heat effect of the laser and improve the quality of the output laser beam and the stability of the laser system. The invention distributes single or a few laser pulse energy to a plurality of sub-pulses of the dual-wavelength alternating laser, and can reduce the energy of a single pulse on the premise of keeping the total energy unchanged.
According to an aspect of the present invention, there is provided a laser for dual wavelength alternately Q-switched output burst pulses, the laser comprising: a first pumping source 15, a first optical fiber 14, a first coupling lens group 13, a second pumping source 2, a second optical fiber 3, a second coupling lens group 4, a laser total reflector 21, an electro-optic Q-switched crystal 22, a polarizer 20, a first 45 ° reflector 19, a first wedge prism 16, a first right-angle prism group 12, a first laser gain medium 10, a first laser output mirror 9, a second 45 ° reflector 24, a quarter-wave plate 18, a second wedge prism 17, a second right-angle prism group 5, a second laser gain medium 7 and a second laser output mirror 8, wherein:
the first right-angle prism group 12 is arranged in front of the first coupling lens group 13 and on one side of the first laser gain medium 10;
the first pump source 15 is disposed behind the first coupling lens group 13, and is connected to the first coupling lens group 13 through the first optical fiber 14, and is configured to provide pump light for the first laser gain medium 10;
the first pump source 15 and the first coupling lens group 13 are arranged in a direction perpendicular to the laser transmission direction;
the second rectangular prism group 5 is arranged behind the second coupling lens group 4 and on one side of the second laser gain medium 7;
the second pump source 2 is disposed in front of the second coupling lens group 4, connected to the second coupling lens group 4 through the second optical fiber 3, and configured to provide pump light for the second laser gain medium 7;
the second pump source 2 and the second coupling lens group 4 are arranged in a direction perpendicular to the laser transmission direction;
the laser total reflector 21, the electro-optic Q-switched crystal 22, the polarizer 20, the first 45-degree reflector 19, the first wedge prism 16, the first right-angle prism group 12, the first laser gain medium 10 and the first laser output mirror 9 form a first path of laser resonant cavity;
the laser total reflector 21, the electro-optical Q-switched crystal 22, the polarizer 20, the first 45-degree reflector 19, the second 45-degree reflector 24, the quarter-wave plate 18, the second wedge prism 17, the second right-angle prism group 5, the second laser gain medium 7 and the second laser output mirror 8 form a second path of laser resonant cavity.
Optionally, the first laser gain medium 10 and the second laser gain medium 7 are disposed in parallel and aligned with a laser output direction.
Optionally, the first laser output mirror 9 is disposed on a side of the first laser gain medium 10 away from the first rectangular prism group 12, and is disposed perpendicular to the laser output direction.
Optionally, the first wedge prism 16, the first 45 ° reflector 19, the polarizer 20, the electro-optic Q-switched crystal 22, and the laser total reflector 21 are sequentially disposed on a side of the first right-angle prism group 12 away from the first laser gain medium 10.
Optionally, the second laser output mirror 8 is disposed on a side of the second laser gain medium 7 away from the second rectangular prism group 5, and is disposed perpendicular to the laser output direction.
Optionally, the second wedge prism 17, the quarter wave plate 18 and the second 45 ° reflector 24 are sequentially disposed on a side of the second rectangular prism group 5 away from the second laser gain medium 7, wherein the second 45 ° reflector 24 is disposed in parallel with the first 45 ° reflector 19, so that the laser is reflected to the second 45 ° reflector 24 after passing through the first 45 ° reflector 19.
Optionally, the laser further includes an electro-optical crystal driving module 23, and the electro-optical crystal driving module 23 is connected to the electro-optical Q-switching crystal 22, and is configured to apply a high-voltage square wave signal to the electro-optical Q-switching crystal 22.
Optionally, the laser further comprises a first temperature control system 11, a second temperature control system 6 and a central control system 1, wherein:
the central control system 1 is connected with the first temperature control system 11, the second temperature control system 6 and the electro-optical crystal driving module 23, and is used for controlling the triggering and the time delay of the electro-optical crystal driving module 23 and controlling the first temperature control system 11 and the second temperature control system 6 to adjust the working temperature of the laser.
Optionally, the first pump source 15 and the second pump source 2 are both semiconductor pump sources.
According to another aspect of the present invention, there is also provided a two-wavelength alternatively Q-switched output burst pulse laser output method, applied in the laser as described above, the method including:
step S1, the first pump source 15 and the second pump source 2 pump the second laser gain medium 7 and the first laser gain medium 10 at equal intervals, respectively;
step S2, in one period of pumping the gain medium by the first pump source 15 and the second pump source 2, applying and removing a quarter-wavelength voltage to the electro-optical Q-switched crystal 22 for multiple times to obtain a dual-wavelength alternate Q-switched output single-period burst laser: when voltage is applied to the electro-optical Q-switched crystal 22, the first path of laser resonant cavity is in a high-loss state, the second path of laser resonant cavity is in a low-loss state, and the second path of laser resonant cavity outputs Q-switched giant pulse laser with a second wavelength; when the voltage of the electro-optical Q-switched crystal 22 is removed, the second path of laser resonant cavity is in a high-loss state, the first path of laser resonant cavity is in a low-loss state, and the first path of laser resonant cavity outputs Q-switched giant pulse laser with the first wavelength;
and step S3, repeating the steps S1 and S2 periodically to obtain the equally-spaced two-wavelength alternate Q-switched output group pulse laser.
The invention combines the pressurized electro-optic Q-switch with the voltage-releasing electro-optic Q-switch to realize the output of the dual-wavelength alternate Q-switch group pulse laser. In each period of pumping the gain medium by the pumping source, square wave driving signals are applied to the electro-optical Q switch for multiple times, and then dual-wavelength alternate Q-switching group pulse laser output can be obtained. In addition, because the two pumping sources pump the gain medium at equal intervals, a certain interval exists between the output dual-wavelength group pulses in each period, and the intermittent oscillation can relieve the problem of the thermal effect of the laser.
Drawings
FIG. 1 is a schematic diagram of a prior art laser that outputs burst pulses;
FIG. 2 is a schematic diagram of a dual-wavelength alternatively Q-switched output burst laser according to an embodiment of the present invention;
FIG. 3 is a timing diagram of driving signals according to an embodiment of the invention;
FIG. 4 is a pulse sequence diagram of a dual wavelength alternate Q-switched output burst laser in accordance with one embodiment of the present invention;
FIG. 5 is a flowchart of a method for outputting a burst laser with dual wavelength alternate Q-switched output according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
According to an aspect of the present invention, there is provided a dual wavelength alternately Q-switched output burst laser, as shown in fig. 2, comprising: a first pumping source 15, a first optical fiber 14, a first coupling lens group 13, a second pumping source 2, a second optical fiber 3, a second coupling lens group 4, a laser total reflector 21, an electro-optic Q-switched crystal 22, a polarizer 20, a first 45 ° reflector 19, a first wedge prism 16, a first right-angle prism group 12, a first laser gain medium 10, a first laser output mirror 9, a second 45 ° reflector 24, a quarter-wave plate 18, a second wedge prism 17, a second right-angle prism group 5, a second laser gain medium 7 and a second laser output mirror 8, wherein:
the first right-angle prism group 12 is disposed in front of the first coupling lens group 13 and on one side of the first laser gain medium 10.
The first pump source 15 is disposed behind the first coupling lens group 13, and is connected to the first coupling lens group 13 through the first optical fiber 14, and is configured to provide pump light for the first laser gain medium 10.
The first pump source 15 and the first coupling lens group 13 are disposed in a direction perpendicular to the laser transmission direction.
In the present embodiment, the pump light emitted from the first pump source 15 is shaped by the first optical fiber 14, the first coupling lens group 13, and the first rectangular prism group 12 in this order, and then incident on the first laser gain medium 10.
The second rectangular prism group 5 is arranged behind the second coupling lens group 4 and on one side of the second laser gain medium 7.
The second pump source 2 is disposed in front of the second coupling lens group 4, and is connected to the second coupling lens group 4 through the second optical fiber 3, and is configured to provide pump light for the second laser gain medium 7.
The second pump source 2 and the second coupling lens group 4 are arranged in a direction perpendicular to the laser transmission direction.
In the present embodiment, the pump light emitted from the second pump source 2 is shaped by the second optical fiber 3, the second coupling lens group 4, and the second rectangular prism group 5 in this order, and then enters the second laser gain medium 7.
The laser total reflector 21, the electro-optic Q-switched crystal 22, the polarizer 20, the first 45-degree reflector 19, the first wedge prism 16, the first right-angle prism group 12, the first laser gain medium 10 and the first laser output mirror 9 form a first path of laser resonant cavity;
the laser total reflector 21, the electro-optical Q-switched crystal 22, the polarizer 20, the first 45-degree reflector 19, the second 45-degree reflector 24, the quarter-wave plate 18, the second wedge prism 17, the second right-angle prism group 5, the second laser gain medium 7 and the second laser output mirror 8 form a second path of laser resonant cavity.
In one embodiment of the present invention, the first laser gain medium 10 and the second laser gain medium 7 are disposed in parallel and aligned with a laser output direction.
In one embodiment of the present invention, the first laser output mirror 9 is disposed on a side of the first laser gain medium 10 away from the first rectangular prism group 12, and is disposed perpendicular to the laser output direction.
In one embodiment of the present invention, the first wedge prism 16, the first 45 ° reflector 19, the polarizer 20, the electro-optic Q-switched crystal 22, and the total laser reflector 21 are sequentially disposed on a side of the first right-angle prism group 12 away from the first laser gain medium 10.
In one embodiment of the present invention, the second laser output mirror 8 is disposed on a side of the second laser gain medium 7 away from the second rectangular prism group 5, and is disposed perpendicular to the laser output direction.
In an embodiment of the present invention, the second wedge prism 17, the quarter wave plate 18, and the second 45 ° mirror 24 are sequentially disposed on a side of the second rectangular prism group 5 away from the second laser gain medium 7, wherein the second 45 ° mirror 24 is disposed in parallel with the first 45 ° mirror 19.
In the above embodiment, the second 45 ° reflecting mirror 24 is disposed parallel to the first 45 ° reflecting mirror 19, so that the laser light is reflected by the first 45 ° reflecting mirror 19 onto the second 45 ° reflecting mirror 24, thereby achieving laser separation.
In one embodiment of the present invention, the first pump source 15 and the second pump source 2 are both semiconductor pump sources.
In an embodiment of the present invention, the electro-optic Q-switched crystal 22 is LN, KD × P, KDP, LiNbO3Isoelectric optical crystal.
In an embodiment of the present invention, the laser further includes an electro-optical crystal driving module 23, and the electro-optical crystal driving module 23 is connected to the electro-optical Q-switching crystal 22, and is configured to apply a high-voltage square wave signal to the electro-optical Q-switching crystal 22.
In an embodiment of the present invention, the laser further comprises a first temperature control system 11, a second temperature control system 6 and a central control system 1, wherein:
the central control system 1 is connected with the first temperature control system 11, the second temperature control system 6 and the electro-optical crystal driving module 23, and is used for controlling the triggering and the time delay of the electro-optical crystal driving module 23 and controlling the first temperature control system 11 and the second temperature control system 6 to adjust the working temperature of the laser.
The working principle of the dual-wavelength alternate Q-switching output group pulse laser is as follows:
the two pumping sources respectively pump the first laser gain medium 10 and the second laser gain medium 7 at equal intervals, and in each period of pumping the gain medium by the pumping sources, the quarter-wavelength voltage is applied and removed to the electro-optical Q-switched crystal 22 for multiple times:
when a quarter-wavelength voltage is applied to the electro-optic Q-switched crystal 22, a first path of laser passes through the polarizer 20 and then becomes linearly polarized light, under the action of an external electric field, after the linearly polarized light passes through the electro-optic Q-switched crystal 22 twice back and forth, the polarization direction of the original linearly polarized light is deflected by 90 degrees, the polarization direction of the polarizer 20 is orthogonal to the transmission direction of the polarizer and is reflected out of the first path of laser resonant cavity, oscillation cannot be formed in the first path of laser resonant cavity, so that the first path of laser resonant cavity is in a high-loss state, and the first laser gain medium 10 is in a population inversion (energy storage) state; under the action of the quarter-wave plate 18 in the second laser resonant cavity, the polarization direction of the polarized light passing back and forth through the electro-optical Q-switched crystal 22 is rotated by 90 degrees, so that the polarization direction of the polarized light at the polarizer 20 is the same as the transmission direction of the polarized light, the second laser resonant cavity of the second laser gain medium 7 is in a low-loss state, and the Q-switched giant pulse output of the second laser can be realized.
When the quarter-wavelength voltage of the electro-optic Q-switching crystal 22 is removed, the first path of laser light passes through the polarizer 20 and then becomes linearly polarized light, the polarization direction of the original linearly polarized light is unchanged after the electro-optic Q-switching crystal 22 passes through twice due to the action of no external electric field, the polarization direction of the original linearly polarized light is the same as the transmission direction of the original linearly polarized light at the polarizer 20, oscillation can be formed in the first path of laser resonant cavity, and avalanche transition occurs on the number of particles reversed at the upper energy level in the first laser gain medium 10 at the last moment and the Q-switching giant pulse output of the first path of laser light is formed; under the action of the quarter-wave plate 18 in the resonant cavity of the second laser, the polarization direction of the polarized light passing back and forth through the electro-optical Q-switched crystal 22 is rotated by 90 degrees, so that the polarization direction of the polarized light at the polarizer 20 is orthogonal to the transmission direction thereof, and the resonant cavity of the second laser gain medium 7 is in a high-loss state, and the upper energy level of the second laser gain medium 7 is subjected to inversion population accumulation and cannot form giant-pulse Q-switched laser output.
In one embodiment of the present invention, the first laser gain medium 10 is Nd: YAG crystal with size of 4X 50mm3The two ends are plated with 1319nm antireflection films (T is more than 99%); the second laser gain medium 7 is Nd: YAG crystal with size of 4X 50mm3And the two ends are plated with anti-reflection films with the thickness of 1064nm (T is more than 99%). The laser total reflector 21 is a flat-flat mirror, and the surface close to the cavity is plated with 1064nm&The reflectivity of the 1319nm high-reflectivity film is more than 99%, the first laser output mirror 9 is a flat-flat mirror, one surface close to the cavity is plated with a 1319nm partial-transmissivity film, the transmissivity is 4%, and the outer side is plated with an anti-reflection film of 1319nm laser. The second laser output mirror 8 is a flat-flat mirror, a 1064nm partial transmittance film is plated on one surface close to the cavity, the transmittance is 6%, and an anti-reflection film of 1064nm laser is plated on the outer side. Polarizer 20 plated 1064nm&The 1319nm laser Brewster angle antireflection film has the laser transmittance of both wavelengths of more than 98%. The quarter-wave plate 18 corresponds to a wavelength of 1064nm, and two light-transmitting surfaces are plated with anti-reflection films of 1064nm (T is more than 98%). The 1064nm high-reflection film is plated on one side, close to the polarizer 20, of the first 45-degree reflecting mirror 19, and the reflectivity is greater than 98%, and the 1064nm high-reflection film is plated on one side, close to the quarter-wave plate 18, of the second 45-degree reflecting mirror 24, and the reflectivity is greater than 98%. One surface of the first right-angle prism group 12 close to the first laser gain medium 10 is plated with an antireflection film of 1319nm, and the transmittance is greater than 98%. And a 1064nm antireflection film is plated on one surface of the second rectangular prism group 5 close to the second laser gain medium 7, and the transmittance is greater than 98%. The first temperature control system 11 and the second temperature control system 6 can control the laser to work at room temperature of 25 ℃, the central control system 1 controls the triggering and the time delay of the two laser power supplies and the electro-optical crystal driving module 23, and the time sequence of each driving signal applied to the two laser power supplies and the electro-optical crystal driving module 23 is shown in fig. 3, wherein V1For exciting the voltage waveform, V, of the first pump source 152For exciting the voltage waveform of the second pump source 2, VQIs the voltage waveform applied to the electro-optically Q-switched crystal 22. Based on the laser structure shown in FIG. 2, the electro-optical Q-switched crystal 22 is retreatedThe first path will produce a Q-switched laser output when pressurized, and the second path when pressurized to electro-optic Q-switched crystal 22. From the entire time sequence, a sequence of Q-switched output pulses is produced as shown in FIG. 4.
According to another aspect of the present invention, there is also provided a two-wavelength alternate Q-switched output burst pulse laser output method, as shown in fig. 5, the method includes steps S701 to S705:
in step S701, the first pump source 15 and the second pump source 2 pump the first laser gain medium 10 and the second laser gain medium 7 at equal intervals by using low repetition frequency wide pulses, respectively.
In step S702, in each period of pumping the gain medium by the first pump source 15 and the second pump source 2, a voltage is applied to the electro-optical Q-switched crystal 22, the first laser resonant cavity is in a high-loss state, the second laser resonant cavity is in a low-loss state, and the second laser resonant cavity outputs a second wavelength Q-switched giant pulse laser.
In step S703, in each period in which the first pump source 15 and the second pump source 2 pump the gain medium, the voltage is removed from the electro-optical Q-switched crystal 22, the second laser resonant cavity is in a high-loss state, the first laser resonant cavity is in a low-loss state, and the first wavelength Q-switched giant pulse laser is output.
In step S704, repeating the steps S702 and S703 to obtain a dual-wavelength alternate Q-switched output single-period burst laser;
in step S705, the steps S701 and S704 are periodically repeated to obtain a two-wavelength alternately Q-switched output burst laser with equal intervals.
In one embodiment of the present invention, the voltage applied to the electro-optically Q-switched crystal 22 is a quarter-wave high-voltage square-wave signal.
In this embodiment, for step S702, in each period of pumping the gain medium by the pump source, when a quarter-wavelength voltage is applied to the electro-optic Q-switched crystal 22, the first path of laser light passes through the polarizer 20 and then becomes linearly polarized light, and after passing through the electro-optic Q-switched crystal 22 twice back and forth under the action of an external electric field, the polarization direction of the original linearly polarized light is deflected by 90 degrees, and the polarization direction of the polarizer 20 is orthogonal to the transmission direction thereof and reflected outside the first path of laser resonant cavity, so that oscillation cannot be formed in the first path of laser resonant cavity, and thus the first path of laser resonant cavity is in a high-loss state, and the first laser gain medium 10 is in a population inversion state; under the action of the quarter-wave plate 18 in the second laser resonant cavity, the polarization direction of the polarized light passing back and forth through the electro-optical Q-switched crystal 22 is rotated by 90 degrees, so that the polarization direction of the polarized light at the polarizer 20 is the same as the transmission direction, the second laser resonant cavity of the second laser gain medium 7 is in a low-loss state, and Q-switched giant pulse output of a plurality of second lasers can be realized.
For step S703, in each period of pumping the gain medium by the pump source, when the electro-optic Q-switched crystal 22 is deenergized by a quarter-wavelength voltage, the first path of laser light passes through the polarizer 20 and then becomes linearly polarized light, and since there is no external electric field, after passing through the electro-optic Q-switched crystal 22 twice, the polarization direction of the original linearly polarized light does not change, and the polarization direction at the polarizer 20 is the same as the transmission direction thereof, so that oscillation can be formed in the first path of laser resonant cavity, and the number of particles reversed at the upper energy level in the first laser gain medium 10 at the previous time will undergo avalanche transition and form a Q-modulated giant pulse output of the first path of laser light; under the action of the quarter-wave plate 18 in the resonant cavity of the second laser, the polarization direction of the polarized light passing back and forth through the electro-optical Q-switched crystal 22 is rotated by 90 degrees, so that the polarization direction of the polarized light at the polarizer 20 is orthogonal to the transmission direction thereof, and the resonant cavity of the second laser gain medium 7 is in a high-loss state, and the upper energy level of the second laser gain medium 7 is subjected to inversion population accumulation and cannot form giant-pulse Q-switched laser output.
Based on the technical scheme, under the condition that the square wave driving signal is applied to the electro-optical Q switch for multiple times in each period of the pumping source pumping the gain medium, the dual-wavelength alternate Q-switching group pulse laser output can be obtained, and an effective way is provided for obtaining high repetition frequency laser. In addition, because the two pumping sources pump the gain medium at equal intervals, a certain interval exists between the output dual-wavelength group pulses in each period, and the intermittent oscillation can relieve the problem of the thermal effect of the laser.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A dual wavelength alternately Q-switched output burst pulse laser, said laser comprising: first pump source (15), first optic fibre (14), first coupling lens group (13), second pump source (2), second optic fibre (3), second coupling lens group (4), laser holophote (21), the electro-optic Q-switched crystal (22), polarizer (20), first 45 speculum (19), first wedge prism (16), first right angle prism group (12), first laser gain medium (10), first laser output mirror (9), second 45 speculum (24), quarter wave plate (18), second wedge prism (17), second right angle prism group (5), second laser gain medium (7) and second laser output mirror (8), wherein:
the first right-angle prism group (12) is arranged in front of the first coupling lens group (13) and on one side of the first laser gain medium (10);
the first pump source (15) is arranged behind the first coupling lens group (13) and connected to the first coupling lens group (13) through the first optical fiber (14) and used for providing pump light for the first laser gain medium (10);
the first pump source (15) and the first coupling lens group (13) are arranged in a direction perpendicular to the laser transmission direction;
the second rectangular prism group (5) is arranged behind the second coupling lens group (4) and is arranged on one side of the second laser gain medium (7);
the second pump source (2) is arranged in front of the second coupling lens group (4), is connected to the second coupling lens group (4) through the second optical fiber (3), and is used for providing pump light for the second laser gain medium (7);
the placing direction of the second pump source (2) and the second coupling lens group (4) is vertical to the laser transmission direction;
the laser total reflector (21), the electro-optic Q-switched crystal (22), the polarizer (20), the first 45-degree reflector (19), the first wedge prism (16), the first right-angle prism group (12), the first laser gain medium (10) and the first laser output mirror (9) form a first path of laser resonant cavity;
the laser total reflector (21), the electro-optic Q-switched crystal (22), the polarizer (20), the first 45-degree reflector (19), the second 45-degree reflector (24), the quarter-wave plate (18), the second wedge prism (17), the second right-angle prism group (5), the second laser gain medium (7) and the second laser output mirror (8) form a second laser resonant cavity.
2. A laser according to claim 1, characterized in that said first laser gain medium (10) and said second laser gain medium (7) are placed in parallel and in line with the laser output direction.
3. The laser of claim 1, wherein the first laser output mirror (9) is disposed on a side of the first laser gain medium (10) remote from the first prism assembly (12) and perpendicular to a laser output direction.
4. A laser according to claim 1, characterized in that the first wedge prism (16), the first 45 ° mirror (19), the polarizer (20), the electro-optically Q-switched crystal (22) and the total laser reflection mirror (21) are placed in sequence on the side of the first right angle prism group (12) away from the first laser gain medium (10).
5. The laser according to claim 1, wherein the second laser output mirror (8) is disposed on a side of the second laser gain medium (7) remote from the second rectangular prism group (5) and perpendicular to the laser output direction.
6. A laser according to claim 1, characterized in that the second wedge prism (17), the quarter wave plate (18), and the second 45 ° mirror (24) are placed in sequence on the side of the second right angle prism set (5) away from the second laser gain medium (7), wherein the second 45 ° mirror (24) is placed in parallel with the first 45 ° mirror (19).
7. The laser device as claimed in claim 1, further comprising an electro-optical crystal driving module (23), wherein the electro-optical crystal driving module (23) is connected to the electro-optical Q-switching crystal (22) for applying a high-voltage square wave signal to the electro-optical Q-switching crystal (22).
8. The laser according to claim 7, characterized in that it further comprises a first temperature control system (11), a second temperature control system (6) and a central control system (1), wherein:
the central control system (1) is connected with the first temperature control system (11), the second temperature control system (6) and the electro-optical crystal driving module (23) and used for controlling triggering and time delay of the electro-optical crystal driving module (23) and controlling the first temperature control system (11) and the second temperature control system (6) to adjust the working temperature of the laser.
9. The laser according to claim 1, characterized in that the first pump source (15) and the second pump source (2) are both semiconductor pump sources.
10. A dual wavelength alternate Q-switched output burst pulse laser output method for use in the laser of any of claims 1-9, the method comprising:
step S1, a first pump source (15) and a second pump source (2) pump a first laser gain medium (10) and a second laser gain medium (7) respectively at equal intervals;
step S2, in a period that the first pump source (15) and the second pump source (2) pump the gain medium, the electro-optical Q-switching crystal (22) is applied and removed with quarter-wavelength voltage for many times, and the single-period group pulse laser with dual-wavelength alternate Q-switching output is obtained: when voltage is applied to the electro-optical Q-switched crystal (22), the first path of laser resonant cavity is in a high-loss state, the second path of laser resonant cavity is in a low-loss state, and the second path of laser resonant cavity outputs Q-switched giant pulse laser with a second wavelength; when the electro-optic Q-switching crystal (22) is de-energized, the second laser resonant cavity is in a high-loss state, the first laser resonant cavity is in a low-loss state, and the first laser resonant cavity outputs a first wavelength Q-switching giant pulse laser;
and step S3, repeating the steps S1 and S2 periodically to obtain the equally-spaced two-wavelength alternate Q-switched output group pulse laser.
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