CN102646920A - Intracavity-frequency-doubling 532nm single-longitudinal-mode laser based on seed light injection - Google Patents
Intracavity-frequency-doubling 532nm single-longitudinal-mode laser based on seed light injection Download PDFInfo
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Abstract
The invention relates to an intracavity-frequency-doubling 532nm single-longitudinal-mode laser based on seed light injection. A resonance detection method is used for obtaining 1064nm single-frequency pulse laser for seed injection is obtained and 532nm single-longitudinal-mode pulse laser is obtained through intracavity frequency doubling. A laser resonant cavity is a U-shaped cavity. Two high-peak-power laser diodes (LD) are used for pumping laser crystals from an end surface, a high-precision thermoelectric cooler is used for controlling the temperature of the laser crystals and green light output is obtained through intracavity lithium triborate (LBO) frequency doubling. The intracavity-frequency-doubling 532nm single-longitudinal-mode laser based on seed light injection has the characteristics of high efficiency, high energy, conduction cooling, narrow line width, high frequency stability, compact structure and high working stability.
Description
Technical field
The present invention relates to all solid state laser, the intracavity frequency doubling 532nm single longitudinal mode laser that particularly a kind of seed light is injected.
Background technology
Three-dimensional atmospheric wind information data can greatly improve accuracy military and the civic area numerical weather forecast, especially has a wide range of applications at dual-use aviation field, ground-to-air etc.Doppler lidar is to measure a kind of very effective means that the atmosphere wind speed field distributes, and has compared quick and precisely with traditional windfinding radar, characteristics such as resolution height.In the Doppler lidar most crucial most important be exactly 532nm pure-tone pulse LASER Light Source, therefore inventing out the intracavity frequency doubling 532nm single longitudinal mode laser that the seed light of dependable performance compact conformation injects has very important meaning for geoscience research.
Current generation, if will obtain 532nm single longitudinal mode pulse laser, common methods is that the single longitudinal mode pulse laser with 1064nm carries out cavity external frequency multiplication, utilizes the spectroscope of 532nm and 1064nm that it is separated then.And for Doppler lidar, the single longitudinal mode pulse laser of 1064nm is useless, also must sponge or adopt additive method to dispose it in concrete the use.In addition, the efficient of cavity external frequency multiplication is not high, and promptly the electrical efficiency of whole system is lower.And the single longitudinal mode laser that is employed in the seed injection carries out intracavity frequency doubling, both can improve the electrical efficiency of system, can also simplify optical system, makes the structure of whole laser compact more.But, up to the present, the intracavity frequency doubling 532nm single longitudinal mode laser report that does not also have the seed light beam to go into.
Summary of the invention
The objective of the invention is to fill up above-mentioned blank, the intracavity frequency doubling 532nm single longitudinal mode pulse laser that provides a kind of seed to inject.This laser has the characteristics of high efficiency, high-energy, conduction cooling, narrow linewidth, high frequency stability, compact conformation and working stability.
Technical solution of the present invention is following:
The intracavity frequency doubling 532nm single longitudinal mode laser that a kind of seed light is injected utilizes the resonance probe method to obtain seed and injects 1064nm pure-tone pulse laser, and obtains the single longitudinal mode pulse laser of 532nm through intracavity frequency doubling.Laserresonator adopts the U-shaped chamber, and the LD that adopts two high-peak powers utilizes high-precision TEC to come to the laser crystal temperature control from the end pumped laser crystal, utilizes the LBO frequency multiplication to obtain green glow in the chamber in and exports.The present invention utilizes on-plane surface annular laser as seed laser, adopts the method for seed injection and intracavity frequency doubling to realize high efficiency 532nm single-frequency Q-switch laser output.Laser resonant cavity is selected U type standing-wave cavity for use, takes both-end pumping.
The intracavity frequency doubling 532nm single longitudinal mode laser apparatus that a kind of seed light is injected, characteristics are that its structure comprises seed light path outside the chamber, the driven resonant cavity of U-shaped, electricity control and treatment and intracavity frequency doubling four parts:
The seed light path part is made up of seed laser, isolator, half-wave plate, first quarter wave plate, coupled lens group, first speculum and second speculum successively outside the described chamber;
The driven resonator cavity part of described U-shaped is made up of Effect of Back-Cavity Mirror, adjusting Q crystal, second quarter wave plate, Brewster's angle polarizer slice, the 3rd quarter wave plate, first spectroscope, gain media, second spectroscope, the 4th quarter wave plate, compensation negative lens and front cavity mirror successively; Gain media in the driven resonant cavity of this U-shaped adopts both-end pumping; One end is made up of first pumping source, first pumping coupling system and first spectroscope successively, and the other end is made up of second pumping source, first pumping coupling system and second spectroscope; First spectroscope and second spectroscope all are thoroughly high and high anti-to the oscillating laser of 1064nm to the pump light of 808nm;
Described electricity control and treatment part is made up of photodiode, first piezoelectric ceramic that is anchored on Effect of Back-Cavity Mirror, second piezoelectric ceramic, drive power supply for piezoelectric ceramics and the sequential control system that is anchored on described full chamber mirror; The output of described drive power supply for piezoelectric ceramics is connected with the input of first piezoelectric ceramic with second piezoelectric ceramic respectively; The input of described sequential control system links to each other with described photodiode output, and the output of described sequential control system is connected with control end, first pumping source and the control end of second pumping source of the input of described drive power supply for piezoelectric ceramics, described adjusting Q crystal KD*P respectively;
Described intracavity frequency doubling part is made up of half-wave plate, first spectroscope, frequency-doubling crystal and second spectroscope, and described first spectroscope or second spectroscope are laser output mirror.
Described seed laser is a single longitudinal mode laser of output continuously, and live width has very high frequency stability in the kHz magnitude.
Described coupled lens group is carried out conversion with seed light, make its in the resonant cavity of the driven chamber of described U-shaped Anywhere spot size with the vibration spot size consistent.
Described gain media is a bonding Nd:YAG crystal, and two ends undope, and center doped region length is 30mm, and doping content is 0.3at.%, and the temperature of utilizing thermoelectric module (TEC) to come the ride gain medium is to reach high accuracy of temperature control.
Described Effect of Back-Cavity Mirror and front cavity mirror all are flat mirrors, and they are respectively 5% and 0. to the transmitance of 1064nm
Described first pumping source and second pumping source are that peak power is two high-power semiconductor lasers of 150W centre wavelength 808nm, all are operated in pulse mode.
Described the 3 1/4 1 wave plate and the 4th quarter wave plate are eliminated effects of spatial through the suitable anglec of rotation, form the inhibition competition between each longitudinal mode.
Described sequential control system is given first pumping source and the second pumping source triggering signal in the starting point of each work period; The two output 808nm pump light is to laser crystal; Drive power supply for piezoelectric ceramics applies a ramp voltage on second piezoelectric ceramic in each pumping cycle long to change chamber, driven chamber; When the sequential control system detects the peak value of the interference signal on the photodiode, open Q-switch, export single longitudinal mode laser immediately; Described drive power supply for piezoelectric ceramics loads a direct current voltage for described first piezoelectric ceramic after each bright dipping, to keep the stable of bright dipping time.
Described frequency-doubling crystal is lithium triborate crystal (LBO), adopts one type of phase matched.
Described seed laser output single-frequency continuous laser, live width is in the kHz magnitude, and power output is 500 mW.The isolator of two series connection provides the isolation greater than 60 dB, prevents that the laser that resonant cavity produces from coming out to get into seed laser from Effect of Back-Cavity Mirror, disturbs its operate as normal.Two coupled lens are to seed laser Shu Jinhang conversion coupling, make seed laser in resonant cavity, with himself vibration light beam same spot size arranged.Back to back is half-wave plate and quarter-wave plate, and the combination of the two can produce elliptically polarized light.Seed light is in Effect of Back-Cavity Mirror enters into resonant cavity, and s light is gone out outside the chamber by anti-during through the Brewster's angle polarizer slice, the p light that sees through again through one back and forth the back before polarizer slice, become s light, also gone out outside the chamber by counter.Twice anti-s light interference that goes out, its interference signal has comprised the chamber long.The quarter-wave plate at crystal two ends is to form the inhibition competition between each longitudinal mode in order to eliminate the effects of spatial of standing-wave cavity, to make.The half-wave plate of frequency multiplication part is to get into frequency-doubling crystal LBO for what make first-harmonic with suitable polarization state.
The present invention has the following advantages:
1, adopts LBO intracavity frequency doubling technology, and two 532/1064 spectroscopes are arranged, make whole laser that high electro-optical efficiency arranged.
2, adopt low-doped bonding crystal, reduce the thermal focal and the thermally induced birefringence of crystal, also reduced the temperature gradient of crystals.
3, adopt the U-shaped chamber, compact conformation, volume is little.In addition, utilize both-end pumping to help to improve pump power and reduce longitudinal temperature gradient, thereby improve average power and single pulse energy.
4, this laser adopts initiatively temperature control active heat removal, and high-precision thermoelectric module TEC temperature control is the main guarantee of output laser high frequency stability.This makes this laser can not only adapt to general operational environment requirement, can also adapt to airborne and spaceborne requirement.
Description of drawings
Fig. 1 is the optical system block diagram of laser of the present invention.
Fig. 2 is the connection layout of the electricity control and treatment part of this laser.
Embodiment
Below in conjunction with accompanying drawing and embodiment this patent is further specified, but should not limit protection scope of the present invention with this.
Please with reference to Fig. 1, Fig. 1 is the whole optical system block diagram of laser of the present invention earlier.The intracavity frequency doubling 532nm single longitudinal mode laser apparatus visible by figure, that seed light of the present invention is injected, its structure comprise the driven resonant cavity of seed light path 1 outside the chamber, U-shaped 2, electricity control and treatment 3 and intracavity frequency doubling 4 four parts:
Seed light path part 1 is made up of seed laser 1-1, isolator 1-2, half-wave plate 1-3, the first quarter wave plate 1-4, coupled lens group 1-5,1-6, the first speculum 1-7 and the second speculum 1-8 successively outside the described chamber;
The driven resonator cavity part 2 of described U-shaped is made up of Effect of Back-Cavity Mirror 2-6, adjusting Q crystal 2-7, the second quarter wave plate 2-8, Brewster's angle polarizer slice 2-9, the 3rd quarter wave plate 2-10, the first spectroscope 2-4, gain media 2-5, the second spectroscope 2-14, the 4th quarter wave plate 2-11, compensation negative lens 2-12 and front cavity mirror 2-13 successively; Gain media 2-5 in the driven resonant cavity of this U-shaped adopts both-end pumping; One end is made up of the first pumping source 2-1, the first pumping coupling system 2-2 and 2-3 and the first spectroscope 2-4 successively, and the other end is made up of the second pumping source 2-17, the first pumping coupling system 2-16 and 2-15 and the second spectroscope 2-14; The first spectroscope 2-4 and the second spectroscope 2-14 are high the passing through of pump light to 808nm, and high anti-to the oscillating laser of 1064nm;
Described electricity control and treatment part 3 is made up of photodiode 3-1, the first piezoelectric ceramic 3-2 that is anchored on Effect of Back-Cavity Mirror 2-6, the second piezoelectric ceramic 3-3, drive power supply for piezoelectric ceramics 3-4 and the sequential control system 3-5 that is anchored on described full chamber mirror 2-13; The output of described drive power supply for piezoelectric ceramics 3-4 is connected with the input of the first piezoelectric ceramic 3-2 and the second piezoelectric ceramic 3-3 respectively; The input of described sequential control system 3-5 links to each other with the output of described photodiode 3-1, and the output of described sequential control system 3-5 is connected with the control end of control end, the first pumping source 2-1 and the second pumping source 2-14 of the input of described drive power supply for piezoelectric ceramics 3-4, described adjusting Q crystal KD*P2-8 respectively;
Described intracavity frequency doubling part 4 is made up of half-wave plate 4-1, the first spectroscope 4-2, frequency-doubling crystal 4-3 and the second spectroscope 4-4, and the described first spectroscope 4-2 or the second spectroscope 4-4 are laser output mirror.
Described seed laser 1-1 is a single longitudinal mode laser of output continuously, and live width has very high frequency stability in the kHz magnitude.
Described coupled lens group 1-5 and 1-6 carry out conversion with seed light, make its in the resonant cavity of the driven chamber of described U-shaped Anywhere spot size with the vibration spot size consistent.
Described gain media 2-5 is a bonding Nd:YAG crystal, and two ends undope, and center doped region length is 30mm, and doping content is 0.3at.%, and the temperature of utilizing thermoelectric module (TEC) to come the ride gain medium is to reach high accuracy of temperature control.
Described Effect of Back-Cavity Mirror 2-6 and front cavity mirror 2-13 are flat mirrors, and they are respectively 5% and 0. to the transmitance of 1064nm
The described first pumping source 2-1 and the second pumping source 2-17 are that peak power is two high-power semiconductor lasers of 150W centre wavelength 808nm, all are operated in pulse mode.
Described the 3 1/4 1 wave plate 2-10 and the 4th quarter wave plate 2-11 eliminate effects of spatial through the suitable anglec of rotation, form the inhibition competition between each longitudinal mode.
Described sequential control system 3-5 gives the first pumping source 2-1 and the second pumping source 2-14 triggering signal in the starting point of each work period; The two output 808nm pump light is to laser crystal; Drive power supply for piezoelectric ceramics applies a ramp voltage on the second piezoelectric ceramic 3-3 in each pumping cycle long to change chamber, driven chamber; When sequential control system 3-5 detects the peak value of the interference signal on the photodiode 3-1, open Q-switch 2-7, export single longitudinal mode laser immediately; Described drive power supply for piezoelectric ceramics 3-4 loads a direct current voltage for the described first piezoelectric ceramic 3-2 after each bright dipping, to keep the stable of bright dipping time.
Described frequency-doubling crystal 4-3 is lithium triborate crystal (LBO), adopts one type of phase matched.
Seed laser 1-1 output single-frequency continuous laser, live width is in the kHz magnitude, and power output is 500 mW.The isolator 1-2 of two series connection provides the isolation greater than 60 dB, prevents that laser that resonant cavity produces from coming out to get into seed laser and disturb its operate as normal from Effect of Back-Cavity Mirror.Two coupled lens 1-3 and 1-4 make seed laser consistent with the vibration light beam spot size of himself in resonant cavity to seed laser Shu Jinhang conversion coupling.Back to back is half-wave plate 1-5 and quarter-wave plate 1-6, and the combination of the two can produce satisfies the needed elliptically polarized light of resonance probe.Seed light enters in the resonant cavity through Effect of Back-Cavity Mirror 2-6, and s light is gone out outside the chamber by anti-during through Brewster's angle polarizer slice 2-9, the p light that sees through again through one back and forth the back before polarizer slice, become s light, also gone out outside the chamber by counter.Twice anti-s light interference that goes out, its interference signal has comprised the chamber long.The quarter-wave plate 2-10 at crystal two ends and 2-11 form the inhibition competition in order to eliminate the effects of spatial of standing-wave cavity, to make between each longitudinal mode, thereby realize the single longitudinal mode vibration.Suitable half-wave plate 4-1 angle makes frequency-doubling crystal LBO4-3 that the good phase coupling arranged, thereby realizes the output of single longitudinal mode green light pulse laser.
Be the parameter of a specific embodiment of the present invention below:
It is the pulse running laser diode of 150 W centre wavelengths, 808 nm that the described first pumping source 2-1 and the second pumping source 2-17 adopt peak power, and be 1 ms pumping cycle, and duty ratio is 26 %.Gain media 2-5 adopts the bonding crystal bar YAG/Nd:YAG/YAG of φ 4*40, and 30 middle mm are doped region, and doping content is 0.3at.%, and each 5mm of two ends undopes.Resonant cavity chamber length is 520 mm, and Effect of Back-Cavity Mirror 2-6 and outgoing mirror 4-4 or 4-2 are flat mirrors, adopt potassium dideuterium phosphate (KD
*P) do electric-optically Q-switched crystal 2-7.Adopt three lithium borates of I class phase matched, LiB
3O
5Make frequency-doubling crystal 4-3.Utilize improved resonance probe method to obtain seed and inject pure-tone pulse laser, utilize intracavity frequency doubling to realize green glow output efficiently.532 nm pure-tone pulse laser of output 5 mJ pulse energies under the pulse repetition frequency of 1000 Hz, output laser pulse width (FWHM) 10 ns, and have near the spectrum width of the limit and high frequency stability.
Experiment shows that the present invention has the characteristics of high repetition frequency, high-energy, conduction cooling, narrow linewidth, high frequency stability, compact conformation and working stability.
Claims (9)
1. the intracavity frequency doubling 532nm single longitudinal mode laser apparatus that injects of a seed light is characterised in that its structure comprises seed light path (1) outside the chamber, the driven resonant cavity of U-shaped (2), electricity control and treatment (3) and intracavity frequency doubling (4) four parts:
Seed light path part (1) is made up of seed laser (1-1), isolator (1-2), half-wave plate (1-3), first quarter wave plate (1-4), coupled lens group (1-5,1-6), first speculum (1-7) and second speculum (1-8) successively outside the described chamber;
The driven resonator cavity part of described U-shaped (2) is made up of Effect of Back-Cavity Mirror (2-6), adjusting Q crystal (2-7), second quarter wave plate (2-8), Brewster's angle polarizer slice (2-9), the 3rd quarter wave plate (2-10), first spectroscope (2-4), gain media (2-5), second spectroscope (2-14), the 4th quarter wave plate (2-11), compensation negative lens (2-12) and front cavity mirror (2-13) successively; Gain media (2-5) in the driven resonant cavity of this U-shaped adopts both-end pumping; One end is made up of first pumping source (2-1), first pumping coupling system (2-2 and 2-3) and first spectroscope (2-4) successively, and the other end is made up of second pumping source (2-17), first pumping coupling system (2-16 and 2-15) and second spectroscope (2-14); First spectroscope (2-4) and second spectroscope (2-14) all are high the passing through of pump light to 808nm, and high anti-to the oscillating laser of 1064nm;
Described electricity control and treatment part (3) is made up of photodiode (3-1), first piezoelectric ceramic (3-2) that is anchored on Effect of Back-Cavity Mirror (2-6), second piezoelectric ceramic (3-3) that is anchored on described full chamber mirror (2-13), drive power supply for piezoelectric ceramics (3-4) and sequential control system (3-5); The output of described drive power supply for piezoelectric ceramics (3-4) is connected with the input of first piezoelectric ceramic (3-2) with second piezoelectric ceramic (3-3) respectively; The input of described sequential control system (3-5) links to each other with the output of described photodiode (3-1), and the output of described sequential control system (3-5) is connected with the input of described drive power supply for piezoelectric ceramics (3-4), control end, first pumping source (2-1) and the control end of second pumping source (2-14) of described adjusting Q crystal KD*P (2-8) respectively;
Described intracavity frequency doubling part (4) is made up of half-wave plate (4-1), first spectroscope (4-2), frequency-doubling crystal (4-3) and second spectroscope (4-4), and described first spectroscope (4-2) or second spectroscope (4-4) are laser output mirror.
2. the intracavity frequency doubling 532nm single longitudinal mode laser that seed light according to claim 1 is injected is characterized in that described seed laser (1-1) is a single longitudinal mode laser of output continuously, and live width has very high frequency stability in the kHz magnitude.
3. the intracavity frequency doubling 532nm single longitudinal mode laser that seed light according to claim 1 is injected; It is characterized in that described coupled lens group (1-5 and 1-6) carries out conversion with seed light, make its Anywhere spot size in the resonant cavity of the driven chamber of described U-shaped consistent with the vibration spot size.
4. the intracavity frequency doubling 532nm single longitudinal mode laser that seed light according to claim 1 is injected; It is characterized in that described gain media (2-5) is a bonding Nd:YAG crystal; Two ends undope, and center doped region length is 30mm, and doping content is 0.3at.%; The temperature of utilizing thermoelectric module (TEC) to come the ride gain medium is to reach high accuracy of temperature control.
5. the intracavity frequency doubling 532nm single longitudinal mode laser that seed light according to claim 1 is injected is characterized in that described Effect of Back-Cavity Mirror (2-6) and front cavity mirror (2-13) all are flat mirrors, and they are respectively 5% and 0 to the transmitance of 1064nm.
6. the intracavity frequency doubling 532nm single longitudinal mode laser that seed light according to claim 1 is injected; It is characterized in that described first pumping source (2-1) and second pumping source (2-17) are that peak power is two high-power semiconductor lasers of 150W centre wavelength 808nm, all are operated in pulse mode.
7. the intracavity frequency doubling 532nm single longitudinal mode laser that seed light according to claim 1 is injected; It is characterized in that described the 3 1/4 1 wave plate (2-10) and the 4th quarter wave plate (2-11) eliminate effects of spatial through the suitable anglec of rotation, form the inhibition competition between each longitudinal mode.
8. the intracavity frequency doubling 532nm single longitudinal mode laser that seed light according to claim 1 is injected; It is characterized in that described sequential control system (3-5) gives first pumping source (2-1) and second pumping source (2-14) triggering signal in the starting point of each work period; The two output 808nm pump light is to laser crystal; Drive power supply for piezoelectric ceramics applies a ramp voltage on second piezoelectric ceramic (3-3) in each pumping cycle long to change chamber, driven chamber; When sequential control system (3-5) detects the peak value of the interference signal on the photodiode (3-1), open Q-switch (2-7), export single longitudinal mode laser immediately; Described drive power supply for piezoelectric ceramics (3-4) loads a direct current voltage for described first piezoelectric ceramic (3-2) after each bright dipping, to keep the stable of bright dipping time.
9. the intracavity frequency doubling 532nm single longitudinal mode laser that seed light according to claim 1 is injected is characterized in that described frequency-doubling crystal (4-3) is lithium triborate crystal (LBO), adopts one type of phase matched.
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| CN111725693A (en) * | 2020-06-04 | 2020-09-29 | 中国科学院上海光学精密机械研究所 | High-power multi-single-frequency fiber laser frequency doubling system and method |
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