CN110932080A - Single longitudinal mode laser - Google Patents
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- CN110932080A CN110932080A CN201910387038.1A CN201910387038A CN110932080A CN 110932080 A CN110932080 A CN 110932080A CN 201910387038 A CN201910387038 A CN 201910387038A CN 110932080 A CN110932080 A CN 110932080A
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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
- H01S3/1106—Mode locking
- H01S3/1109—Active mode locking
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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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1062—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using a controlled passive interferometer, e.g. a Fabry-Perot etalon
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Abstract
The invention relates to the field of lasers, in particular to a single longitudinal mode laser, which comprises: the device comprises a first parabolic mirror, a second parabolic mirror, a laser total reflector, a laser output mirror, a laser gain medium, an aperture diaphragm, an F-P etalon, an active Q-switching crystal, a confocal spherical scanning interferometer, an oscilloscope, an F-P etalon angle adjusting device, an active Q-switching crystal driver and a signal generator; the F-P etalon angle adjusting device is connected with the F-P etalon and obtains single longitudinal mode laser under the conditions of low pumping power and high pumping power by adjusting the angle of the F-P etalon; compared with the prior art, the single longitudinal mode laser provided by the invention realizes the single longitudinal mode laser by utilizing the pre-laser technology and the F-P etalon technology, and the single longitudinal mode laser can always realize the output of the single longitudinal mode laser by adjusting the rotating angle of the F-P etalon in the process of changing the pumping power from low to high.
Description
Technical Field
The invention relates to the field of lasers, in particular to a single longitudinal mode laser.
Background
The single longitudinal mode laser not only has extremely high spectral responsivity and signal-to-noise ratio, but also is positioned in the single longitudinal mode laser of a visible light wave band, and the emitted laser is very convenient to detect and receive due to the visibility of the single longitudinal mode laser, so that the feedback signal intensity and the detection precision in the fields of laser radar, laser ranging, laser remote sensing, optical frequency standard detection precision and the like can be greatly improved, and therefore, the single longitudinal mode laser has extremely important significance and very wide application prospect in the technical field.
At present, the mode of obtaining single longitudinal mode laser mainly comprises F-P etalon technology and pre-laser technology. The mode of obtaining single longitudinal mode laser by using F-P etalon technology is to screen the intracavity mode by introducing large extra loss, which is commonly found in high power pumped lasers. When the method is applied to low-power pumping, if a high loss difference value (difference of loss between different longitudinal modes) is introduced, the threshold of the laser is easily increased, and laser oscillation cannot be formed, and if a low loss difference value is introduced, the mode selection function of single longitudinal mode laser cannot be formed.
The mode of obtaining single longitudinal mode laser by adopting the pre-laser technology is to carry out exponential amplification on the micro-loss difference between the modes in the cavity for screening. When applied to high-power pumping, the pre-lasing technique cannot amplify the micro-loss difference (the loss difference between the modes inherent in the cavity) in a short time (the spontaneous emission lifetime) to suppress the multi-longitudinal-mode oscillation start phenomenon in the cavity, so the pre-lasing technique is generally applied to low-power pumping, and single-longitudinal-mode laser cannot be obtained during high-power pumping.
The prior art related to the invention is the laser diode pumping pre-laser Q-switching Nd disclosed by Shanghai optical precision machinery research institute of Chinese academy of sciences: YAG single longitudinal mode laser study. The structure adopted is shown in fig. 1. The parts shown in the figures are respectively: the device comprises a pump source temperature control device 101, a semiconductor laser 102, a coupling optical system 103, a laser crystal 104, an acousto-optic Q-switched crystal 105, an output mirror 106, a semiconductor laser driver 107, a synchronous signal control system 108 and a signal generator 109. However, the prior art has the following defects: when the pumping power is changed from low to high in a large range, due to the gradual enhancement of the gain of the transition spectral line, the full competition among the longitudinal modes in the fixed pre-laser time cannot be carried out, so that the number of output laser modes is gradually increased, and the single longitudinal mode laser output is no longer realized. That is, in the process of gradually increasing the pump power, the additional loss cannot be automatically introduced to offset the gain between the longitudinal modes and shorten the competition time between the longitudinal modes, so that the single longitudinal mode laser output cannot be realized. Therefore, the above-mentioned technique is suitable for obtaining single longitudinal mode laser output under low pump power, and is no longer applicable when the pump power is high.
Disclosure of Invention
The invention provides a single longitudinal mode laser, which is used for solving the problem that single longitudinal mode laser cannot be obtained in the range of pumping frequency change from low to high in the prior art.
The invention provides a single longitudinal mode laser, comprising: the device comprises a first parabolic mirror, a second parabolic mirror, a laser total reflector, a laser output mirror, a laser gain medium, an aperture diaphragm, an F-P etalon, an active Q-switching crystal, a confocal spherical scanning interferometer, an oscilloscope, an F-P etalon angle adjusting device, an active Q-switching crystal driver and a signal generator;
the first parabolic mirror, the laser gain medium, the second parabolic mirror and the laser total reflector reflect the pump light, so that the pump light is pumped back and forth for multiple times in the laser gain medium;
the laser gain medium, the small aperture diaphragm, the F-P etalon, the active Q-switching crystal and the laser output mirror are sequentially arranged along a light path;
the confocal spherical scanning interferometer is arranged on one side of the laser output mirror, which is far away from the active Q-switching crystal, and is connected with the oscilloscope;
the F-P etalon angle adjusting device is connected with the F-P etalon and obtains single longitudinal mode laser under the conditions of low pumping power and high pumping power by adjusting the angle of the F-P etalon;
the active Q-switching crystal driver is connected with the active Q-switching crystal; the signal generator is connected with the active Q-switching crystal driver.
Optionally, under low pumping power, the angle of the F-P etalon is set to be parallel to the optical path, and the single longitudinal mode laser is obtained by adjusting parameters of the active Q-switched crystal driver and the signal generator.
Optionally, under high pumping power, the confocal spherical scanning interferometer and the oscilloscope perform longitudinal mode number monitoring, and when the number of longitudinal modes is not 1, the F-P etalon angle adjusting device adjusts the angle of the F-P etalon to obtain single longitudinal mode laser.
Optionally, the first parabolic mirror and the second parabolic mirror are placed in parallel at two sides of the light path and between the laser gain medium and the aperture stop; one parabolic sides of the first parabolic mirror and the second parabolic mirror face the laser gain medium respectively.
Optionally, the concave coating of the first parabolic mirror has high reflectivity for wavelengths of 445nm and 522 nm; the concave coating of the second parabolic mirror has high reflectivity for 522nm wavelength.
Optionally, the laser total reflector is disposed on one side of the second parabolic mirror close to the paraboloid, and one side of the laser total reflector close to the second parabolic mirror is coated with a film and then has a high reflectivity to a wavelength of 522 nm.
Optionally, the laser gain medium is Pr: the YLF chip laser crystal is coated with films on the left and right end faces to increase the transmittance at a wavelength of 522 nm.
Optionally, the signal emitted by the signal generator is in the form of periodic two-step electrical pulses, the amplitude and duration of which can be adjusted.
Optionally, the method further comprises: and the controller is respectively connected with the oscilloscope and the F-P etalon angle adjusting device, so that the number of longitudinal modes of the oscilloscope is monitored, and the angle of the F-P etalon is adaptively adjusted by controlling the F-P etalon angle adjusting device.
Optionally, the method further comprises: a heat sink; the heat sink is connected with the laser gain medium and used for dissipating heat of the laser gain medium.
Optionally, the method further comprises: a pumping source, an optical fiber and a coupling lens group;
the pump source, the optical fiber and the coupling mirror group are connected along a light path, and pump light emitted by the pump source is coupled to the first parabolic mirror through the coupling mirror group.
Optionally, the pump source is a semiconductor pump source.
Optionally, the laser is a pumping structure in the form of a disk.
Compared with the prior art, the single longitudinal mode laser provided by the invention at least has the following beneficial effects:
the invention provides a single longitudinal mode laser, which forms a resonant cavity through a laser holophote, a laser gain medium, an aperture diaphragm, an F-P etalon, an active Q-switching crystal and a laser output mirror, forms a pre-laser mode selection device through the active Q-switching crystal, an active Q-switching crystal driver and a signal generator, forms a longitudinal mode number monitoring device through a confocal spherical scanning interferometer and an oscilloscope, forms an F-P etalon mode selection compensation device through the F-P etalon and an F-P etalon angle adjusting device, and realizes single longitudinal mode laser output by utilizing a pre-laser technology and an F-P etalon technology. In the process of changing the pumping power from low to high, the laser can always realize the output of single longitudinal mode laser by adjusting the rotation angle of the F-P etalon.
Drawings
FIG. 1 is a schematic diagram of a prior art pre-laser Q-switched laser;
FIG. 2 is a schematic diagram of a single longitudinal mode laser according to the present invention;
fig. 3 is a schematic diagram of multiple round trip pumping of pump light inside a laser gain medium.
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.
Fig. 2 is a schematic structural diagram of a single longitudinal mode laser according to an embodiment of the present invention.
As shown in fig. 2, the single longitudinal mode laser includes: the device comprises a pumping source 1, an optical fiber 2, a coupling mirror group 3, a laser gain medium 4, a first parabolic mirror 5, an F-P etalon 6, an active Q-switching crystal 7, a laser output mirror 8, a confocal spherical scanning interferometer 9, an oscilloscope 10, a heat sink 11, a laser total reflector 12, a second parabolic mirror 13, an aperture diaphragm 14, an F-P etalon angle adjusting device 15, an active Q-switching crystal driver 16 and a signal generator 17;
in an alternative embodiment, the single longitudinal mode laser outputs a single longitudinal mode laser light in the visible wavelength range, such as green laser light (wavelength around 522 nm).
In an alternative embodiment, the pump source 1 is a semiconductor pump source, for example a 445nm semiconductor laser. The focal length of the coupling lens group 3 is 50 mm.
In an alternative embodiment, the laser gain medium 4 is Pr: YLF (praseodymium-doped lithium yttrium fluoride crystal) sheet laser crystal has the doping concentration of 0.2. a.t%, the radius of 3mm and the thickness of 0.3 mm. Pr: the YLF sheet laser crystal can directly generate visible light, and the coating films on the left and right end faces of the YLF sheet laser crystal can increase the transmissivity to 522nm of wavelength, and the transmissivity is 99.9%.
The laser gain medium 4 is connected with a heat sink 11, and the heat sink 11 is used for reducing the temperature of the laser gain medium 4.
The pumping source 1, the optical fiber 2 and the coupling mirror group 3 are sequentially arranged on one side of the first parabolic mirror 5 close to the paraboloid; after the pump light emitted by the pump source 1 is coupled to the first parabolic mirror 5 through the coupling mirror group 3, the pump light sequentially passes through: the laser particle accumulation device comprises a first parabolic mirror 5, a laser gain medium 4, a second parabolic mirror 13 and a laser total reflector 12, wherein the first parabolic mirror 5, the laser gain medium 4, the second parabolic mirror 13 and the laser total reflector 12 are reflected for multiple times, and pump light can hit different positions of the laser gain medium 4 when passing through the laser gain medium 4 every time, so that the laser gain medium 4 is pumped, pumping energy is provided for the laser gain medium, and reverse particle accumulation is realized. Referring to fig. 3, fig. 3 shows that the pump light passes through multiple round-trip pumping inside the laser gain medium 4.
In an alternative embodiment, the concave coating of the first parabolic mirror 5 has a high reflectivity at wavelengths 445nm, 522 nm; the concave coating of the second parabolic mirror 13 has a high reflectivity at a wavelength of 522 nm.
The laser total reflection mirror 12 is arranged on one side of the second parabolic mirror 13 close to the paraboloid, the laser total reflection mirror 12 is a plane mirror, and after one side of the laser total reflection mirror close to the second parabolic mirror is coated with a film, the laser total reflection mirror has high reflectivity for 522nm of wavelength, and the film system preparation requirement is that the reflectivity for 522nm of wavelength is 98%.
After the pump light is pumped back and forth for multiple times in the laser gain medium 4, an aperture diaphragm 14, an F-P etalon 6, an active Q-switching crystal 7 and a laser output mirror 8 are sequentially arranged along a light path.
The first parabolic mirror 5 and the second parabolic mirror 13 are disposed in parallel at two sides of the optical path, and are disposed between the laser gain medium 4 and the aperture stop 14, and one parabolic sides of the first parabolic mirror 5 and the second parabolic mirror 13 face the laser gain medium 4 respectively.
In an alternative embodiment, the active Q-switched crystal 7 is TiO2The acousto-optic Q-switched crystal has a radio frequency driving range of 0-80 MHz. The laser output mirror 8 is a plano-concave mirror, the concave surface is plated with a 522nm partial transmittance film, and the 522nm laser transmittance is 4%. The aperture diaphragm 14 has a radius of 0.3 mm.
The confocal spherical scanning interferometer 9 is arranged on one side of the laser output mirror 8, which is far away from the active Q-switching crystal 7, and is connected with the oscilloscope 10. The oscilloscope 10 is connected to a controller 18.
The F-P etalon angle adjusting means 15 is connected to the controller 18 and to the F-P etalon 6, respectively. And obtaining single longitudinal mode laser under the conditions of low pumping power and high pumping power by adjusting the angle of the F-P etalon 6.
In an optional embodiment, the controller 18 may adopt a chip or a single chip, and the like, and the controller 18 is connected to the oscilloscope 10 and the F-P etalon angle adjusting device 15 respectively, so as to monitor the number of longitudinal modes of the oscilloscope 10 and perform adaptive adjustment on the angle of the F-P etalon 6 by controlling the F-P etalon angle adjusting device 15.
The angle adjusting device 15 of the F-P etalon can rotate by 10 degrees, and the stepping precision is 5'. After the system reaches a steady state, the single longitudinal mode laser (shown in fig. 2) with the wavelength of 522nm is output to the outside of the resonant cavity of the single longitudinal mode laser through the laser output mirror 8.
The active Q-switching crystal 7 is connected with the active Q-switching crystal driver 16, and the active Q-switching crystal driver 16 is connected with the signal generator 17.
In an alternative embodiment, the signal generator 17 emits a signal in the form of periodic two-step electrical pulses, the amplitude and duration parameters of which are adjustable. In this embodiment, the two-step signal output by the signal generator 17 is 0-1V with an accuracy of 0.05V, the duration of the low voltage signal is 0-40 μ s, and the accuracy is 0.1 μ s.
In an alternative embodiment, the single longitudinal mode laser is a pumping structure in a disc form, so that the thermal lens effect of the laser gain medium 4 can be greatly reduced.
In the single longitudinal mode laser provided by the embodiment of the invention, the laser holophote 12, the laser gain medium 4, the aperture diaphragm 14, the F-P etalon 6, the active Q-switching crystal 7 and the laser output mirror 8 form a resonant cavity with an output waveband of 522nm, the active Q-switching crystal 7, the active Q-switching crystal driver 16 and the signal generator 17 form a pre-laser mode selection device, the confocal spherical scanning interferometer 9 and the oscilloscope 10 form a longitudinal mode number monitoring device, and the F-P etalon 6, the F-P etalon angle adjusting device 15 and the controller 18 form an F-P etalon mode selection compensation device.
The embodiment of the invention realizes the output of the single longitudinal mode laser by utilizing the pre-laser technology and the F-P etalon technology. The laser utilizes the servo motor to drive the F-P etalon 6 to rotate by a corresponding angle so as to introduce additional loss to shorten the mutual competition time between longitudinal modes, thereby realizing the self-adaptive mode selection of a laser system in the process of the change of pumping power from low to high and ensuring that the output of single longitudinal mode laser can be obtained under any pumping power.
In addition, on the one hand, research on visible band lasers has also focused mainly on a small number of several crystals, such as Nd: YAG, Nd: YVO4、Nd：GdVO4And the like. At present, no effective means is available for realizing the wide range of pumping power from low to highThe high-efficiency output of the visible light wave band single longitudinal mode laser is realized.
On the other hand, the common and mature method for obtaining visible-band laser in all-solid-state laser adopts nonlinear frequency conversion means to generate visible-band laser after frequency doubling of single-wavelength near-infrared laser or sum frequency of two-wavelength near-infrared laser, but this method needs to perform nonlinear frequency conversion process, so the light-light conversion efficiency is low.
When the single longitudinal mode laser provided by the invention is used for generating the single longitudinal mode laser in the visible light wavelength range, the single longitudinal mode laser output can be always realized by adaptively adjusting the rotating angle of the F-P etalon 6 in the process of changing the pumping power from low to high, and meanwhile, the light-light conversion efficiency is improved because all nonlinear frequency conversion processes are omitted.
To further explain the technical solution of the embodiment of the present invention, a working process of the pre-laser technology is first explained as follows:
the working process of the pre-laser technology can be divided into the following three stages in terms of time sequence:
(1) seed light formation stage
Unlike the general Q-switched technique, the signal generator used in the pre-lasing technique is a two-step signal generator that generates a periodic stepped voltage signal that varies with time. In a high voltage state, the Q-switching loss in the cavity is high, and the inside of the laser is subjected to reversed particle accumulation; in the process of regulating high voltage to low voltage, the Q regulating loss in the cavity is changed from high to low. At this time, the partially inverted particle transitions from a high energy level to a low energy level and generates a photon to form seed light.
(2) Mode competition phase
When a low voltage is applied to the Q-switched crystal, the intra-cavity losses are low. And the low voltage duration is prolonged, the seed light carries out a natural mode selection process due to the existence of gain and loss difference values among different modes. Meanwhile, because the single-pass gain of the central mode is slightly larger than that of the adjacent mode, and the single-pass loss of the central mode is slightly smaller than that of the adjacent mode, the adjacent mode gradually disappears along with the increase of the low-voltage duration along with the continuation of the mode competition process, and finally single longitudinal mode seed light only in the central mode is formed.
(3) Output process
When the Q-switch is fully opened, a large number of the inverted particles transition from a high energy level to a low energy level and a giant pulse laser is formed. The intensity level of the single longitudinal mode seed light is far larger than that of noise, so that the seed light can replace the noise as initial oscillation starting noise of the laser, and the seed light can amplify the seed light and inhibit other modes again to form the single longitudinal mode pulse laser.
Based on the above description of the pre-lasing technology, how to obtain single longitudinal mode laser by the single longitudinal mode laser provided by the embodiment of the present invention under low pump power and high pump power is described as follows:
under low pumping power, the angle setting of the F-P etalon 6 is parallel to the light path, and single longitudinal mode laser is obtained by adjusting the parameters of the active Q-switched crystal driver 16 and the signal generator 17. In low-power pumping, the micro loss difference value introduced by the F-P etalon 6 is amplified for multiple times by taking the pre-laser technology as the main mode selection technology and the F-P etalon technology as the auxiliary mode selection technology, so that the realizability of the single longitudinal mode laser is ensured, and the light-light conversion efficiency of the single longitudinal mode laser is also ensured.
Under high pumping power, the confocal spherical scanning interferometer 9 and the oscilloscope 10 monitor the number of longitudinal modes, and when the number of the longitudinal modes is not 1, the F-P etalon angle adjusting device 15 adjusts the angle of the F-P etalon 6 to obtain single longitudinal mode laser. When the high-power pump is used, the F-P etalon technology is used as a main mode selection technology, the pre-laser technology is used as an auxiliary mode selection technology, and the high loss difference value introduced by the F-P etalon 6 is simply amplified, so that the realizability of the single-frequency laser is ensured, and the stability of the single-frequency laser is increased.
Referring to fig. 2, the specific working principle of the single longitudinal mode laser is as follows: the pumping light emitted by the semiconductor pumping source 1 enters the laser gain medium 4 through the optical fiber 2, the coupling mirror group 3 and the first parabolic mirror 5 to be pumped back and forth for multiple times, so that pumping energy is provided for the laser gain medium, and the accumulation of reversed particles is realized. The signal generator 17 controls the active Q-switching crystal driver 16 to generate high-frequency ultrasonic waves, and then the active Q-switching crystal 7 generates step loss. With the generation of the step loss, the partially inverted particles overflow to generate photons and oscillate in the resonant cavity between the laser total reflector 12, the laser gain medium 4, the aperture diaphragm 14, the F-P etalon 6, the active Q-switched crystal 7 and the laser output mirror 8 to form seed light.
During low-power pumping, the F-P etalon 6 is placed at 90 degrees, namely, perpendicular to a horizontal line, at the moment, the angle setting of the F-P etalon 6 is parallel to a light path, and single longitudinal mode seed light can be obtained only by adjusting the amplitude and duration of low loss in step loss in a system formed by the active Q-switching crystal driver 16 and the signal generator 17. Specifically, under the action of the aperture diaphragm 14, the transverse mode selection is performed, and finally the single longitudinal mode seed light is formed. And at the moment of forming the single longitudinal mode seed light, completely opening the Q switch, amplifying the single longitudinal mode seed light by the residual reversal particles, and oscillating in a resonant cavity between the laser total reflector 12, the laser gain medium 4, the aperture diaphragm 14, the F-P etalon 6, the active Q-switching crystal 7 and the laser output mirror 8 to form the single longitudinal mode laser.
When the high-power pumping is carried out, the system parameters formed by the active Q-switched crystal driver 16 and the signal generator 17 do not need to be adjusted, the confocal spherical scanning interferometer 9 and the oscilloscope 10 carry out longitudinal mode number monitoring, and when the number of the longitudinal modes is not 1, the controller 18 and the F-P etalon angle adjusting device 15 carry out self-adaptive adjustment on the angle of the F-P etalon 6, so that additional loss is introduced into the system to realize a mode selection compensation function. And finally, when the number of the longitudinal modes is 1, obtaining single longitudinal mode seed light by assisting the small-hole diaphragm 14, and completely opening the Q switch to amplify the single longitudinal mode seed light to obtain single longitudinal mode laser output.
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 single longitudinal mode laser, comprising: the device comprises a first parabolic mirror, a second parabolic mirror, a laser total reflector, a laser output mirror, a laser gain medium, an aperture diaphragm, an F-P etalon, an active Q-switching crystal, a confocal spherical scanning interferometer, an oscilloscope, an F-P etalon angle adjusting device, an active Q-switching crystal driver and a signal generator;
the first parabolic mirror, the laser gain medium, the second parabolic mirror and the laser total reflector reflect the pump light, so that the pump light is pumped back and forth for multiple times in the laser gain medium;
the laser gain medium, the small aperture diaphragm, the F-P etalon, the active Q-switching crystal and the laser output mirror are sequentially arranged along a light path;
the confocal spherical scanning interferometer is arranged on one side of the laser output mirror, which is far away from the active Q-switching crystal, and is connected with the oscilloscope;
the F-P etalon angle adjusting device is connected with the F-P etalon and obtains single longitudinal mode laser under the conditions of low pumping power and high pumping power by adjusting the angle of the F-P etalon;
the active Q-switching crystal driver is connected with the active Q-switching crystal; the signal generator is connected with the active Q-switching crystal driver.
2. The single longitudinal mode laser of claim 1, wherein the F-P etalon is angularly disposed parallel to the optical path at low pump power, and wherein the single longitudinal mode laser is obtained by adjusting parameters of the active Q-switching crystal driver and the signal generator.
3. The single longitudinal mode laser of claim 1, wherein under high pumping power, the confocal spherical scanning interferometer and the oscilloscope perform longitudinal mode number monitoring, and when the number of longitudinal modes is not 1, the F-P etalon angle adjusting device adjusts the angle of the F-P etalon to obtain single longitudinal mode laser.
4. The single longitudinal mode laser of claim 1, wherein the first parabolic mirror and the second parabolic mirror are disposed in parallel on both sides of the optical path and between the laser gain medium and the aperture stop; one parabolic sides of the first parabolic mirror and the second parabolic mirror face the laser gain medium respectively.
5. The single longitudinal mode laser of claim 1, wherein the laser gain medium is Pr: the YLF chip laser crystal is coated with films on the left and right end faces to increase the transmittance at a wavelength of 522 nm.
6. The single longitudinal mode laser of claim 1, wherein the signal emitted by the signal generator is in the form of periodic two-step electrical pulses, the amplitude and duration of which can be adjusted.
7. The single longitudinal mode laser of claim 1, further comprising: and the controller is respectively connected with the oscilloscope and the F-P etalon angle adjusting device, so that the number of longitudinal modes of the oscilloscope is monitored, and the angle of the F-P etalon is adaptively adjusted by controlling the F-P etalon angle adjusting device.
8. The single longitudinal mode laser of claim 1, further comprising: a heat sink; the heat sink is connected with the laser gain medium and used for dissipating heat of the laser gain medium.
9. The single longitudinal mode laser of claim 1, further comprising: a pumping source, an optical fiber and a coupling lens group;
the pump source, the optical fiber and the coupling mirror group are connected along a light path, and pump light emitted by the pump source is coupled to the first parabolic mirror through the coupling mirror group.
10. The single longitudinal mode laser of claim 1, wherein the laser is a pumping structure in the form of a disk.
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| CN101702487A (en) * | 2009-10-29 | 2010-05-05 | 哈尔滨工程大学 | Wavelength rapid shearing thulium-holmium codoping lithium yttrium fluoride longitudinal mode laser |
| CN103236639A (en) * | 2013-04-25 | 2013-08-07 | 长春理工大学 | Self-injection structure for realizing isotropic medium output linearly polarized single-frequency laser |
| CN104158084A (en) * | 2014-09-10 | 2014-11-19 | 哈尔滨工业大学 | Single-doped Ho:YAG single longitudinal mode laser transmitting device on basis of F-P (Fabry-Perot) etalon |
| CN107482425A (en) * | 2017-10-16 | 2017-12-15 | 中国科学院合肥物质科学研究院 | A kind of Gao Zhongying, single longitudinal mode, narrow spaces 2.79um laser pumping source |
| CN107994455A (en) * | 2017-11-23 | 2018-05-04 | 黑龙江工程学院 | A kind of multichannel end pumping narrow spaces thin slice solid state laser |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114156724A (en) * | 2021-12-01 | 2022-03-08 | 厦门大学 | Method for realizing single longitudinal mode output of laser based on parameter optimization |
| CN114156724B (en) * | 2021-12-01 | 2023-12-19 | 厦门大学 | Method for realizing single longitudinal mode output of laser based on parameter optimization |
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