CN103066491A - High-repetition frequency blue violet laser - Google Patents
High-repetition frequency blue violet laser Download PDFInfo
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- CN103066491A CN103066491A CN2012105630817A CN201210563081A CN103066491A CN 103066491 A CN103066491 A CN 103066491A CN 2012105630817 A CN2012105630817 A CN 2012105630817A CN 201210563081 A CN201210563081 A CN 201210563081A CN 103066491 A CN103066491 A CN 103066491A
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Abstract
The invention provides a high-repetition frequency blue violet laser, relates to the technical field of novel lasers, and solves the problems that an existing solid laser is low in laser output power and laser optical quality. The blue violet laser comprises a laser diode (LD) pumping source, a transmission optical fiber, a coupling lens assembly, an alkali metal vapor pond, a resonant cavity, an acousto-optic Q-switch, a convex lens, a first reflector, a second reflector and a frequency doubling crystal. The LD pumping source emits pump light, the transmission optical fiber conveys the pump light into the coupling lens assembly for coupling focus, then the pump light enters the alkali metal vapor pond, alkali metal atoms can carry out effectively population inversion, and then pulse fundamental frequency light can be generated through modulation of the acousto-optic Q-switch and feedback effect of the resonant cavity. The pulse fundamental frequency light is output through an output mirror, focused by the convex lens and then reflected by the first reflector to enter the frequency doubling crystal, the pulse fundamental frequency light is partially conversed into blue violet frequency doubling light, and then the blue violet frequency doubling light is reflected by the second reflector, enters the frequency doubling crystal and is output through the first reflector. The high-repetition frequency blue violet laser is high in laser output power and laser optical quality.
Description
Technical field
The present invention relates to the new laser technical field, be specifically related to a kind of high repetition frequency royal purple laser.
Background technology
Blue and violet laser sources has very important effect in series of basic, Hi-tech Product Development and the defence engineerings such as laser spectroscopy, Atomic Physics, laser medicine, environmental monitoring, laser display and Underwater Laser Communication and detection.
At present, blue and violet laser sources adopts solid state laser (Diode Pumped Solid State Lasers, the DPSSL) structure of semiconductor laser (Laser Diode, LD) pumping more, and it is based on the Nd that mixes of frequency multiplication LD pumping
3+The method of quasi-three-level laser (0.9 μ m) realizes.Yet, utilize the solid state laser of this method to have following problem: at first, to mix Nd
3+The stimulated emission cross section less of quasi-three-level laser, and with four-level laser (1.06 μ m﹠amp; 1.34 μ m) there is gain competition, for realizing the preferential vibration of 0.9 μ m laser, must doping content lower, length is short mixes Nd
3+Laser medium, this restriction is to the raising of laser output power; Secondly, such laser operation also be subjected to absorb again with energy on the impact of effect such as change, the adverse effect that produces for suppressing these effects also must reduce the doping content of medium and shorten its length; In addition, with the increase that LD injects pump power, produce serious thermal effect in the solid laser medium, affect the raising of laser output power and the improvement of beam quality, thereby also have influence on the raising of shg efficiency.Therefore, existing royal purple laser based on frequency multiplication DPSSL is in the power output that improves laser and to improve the aspect such as laser beam quality all very limited, therefore, and in the urgent need to developing the royal purple laser of a kind of high efficiency, high power, high repetition frequency.
Summary of the invention
In order to solve the existing Nd that mixes based on frequency multiplication LD pumping
3+The problem that laser output power is low, laser beam quality is low that the solid state laser of quasi-three-level laser exists the invention provides a kind of high efficiency, high-power high repetition frequency royal purple laser.
The present invention is that the technical scheme that adopts of technical solution problem is as follows:
A kind of high repetition frequency royal purple laser comprises:
The pump light source structure that is formed by the coupled lens group of the Transmission Fibers of the LD pumping source of emission pump light, transmission pump light and coupling focal pumping light, pump light is converted to the vapour of an alkali metal pond of fundamental frequency light, fundamental frequency light is played the resonant cavity of feedback regulation effect, modulation produces the acoustooptic Q-switching of pulse fundamental frequency light, converge the convex lens of pulse fundamental frequency light, be the first speculum of 45 ° with pulse fundamental frequency light light path, with the second speculum of pulse fundamental frequency light light path parallel with pulse fundamental frequency light is converted to the frequency-doubling crystal of royal purple frequency doubled light;
Described resonant cavity is plano-convex unstable cavity, mainly by the front cavity mirror of the high reflection of fundamental frequency light, the outgoing mirror that is used for the polarizer of separately fundamental frequency light and pump light and is used for output pulse fundamental frequency light are formed, described polarizer is placed between described coupled lens group and the vapour of an alkali metal pond, its placement is to the pump light high transmission but to the high reflection of fundamental frequency light, described outgoing mirror is placed between described acoustooptic Q-switching and the convex lens;
The pump light of described LD pumping source emission exports described coupled lens group to by described Transmission Fibers, entered in the described vapour of an alkali metal pond by coupled lens group coupling focusing, make alkali metal atom produce effective population inversion, under the feedback effect of the modulating action of acoustooptic Q-switching and plano-convex unstable cavity, produce the pulse fundamental frequency light of certain repetition rate, pulse fundamental frequency light through outgoing mirror output enters in the frequency-doubling crystal by convex lens focus and by the first mirror reflects again, pulse fundamental frequency light partly is converted to the royal purple frequency doubled light, remaining fundamental frequency light is entered in the frequency-doubling crystal by the second mirror reflects again, thereby utilize fully the fundamental frequency light energy to obtain maximum shg efficiency, final royal purple frequency doubled light is exported through the first speculum.
Increase a vapour of an alkali metal pond, a polarizer and one group of pump light source structure between described acoustooptic Q-switching and outgoing mirror, place near described acoustooptic Q-switching in described vapour of an alkali metal pond, and described pump light source structure is placed near described outgoing mirror.
Between a vapour of an alkali metal pond of described acoustooptic Q-switching and increase, be placed with the 3rd diaphragm.
Described coupled lens group mainly is comprised of first lens and the second lens, is placed between described Transmission Fibers and the polarizer.
The surface of described front cavity mirror, outgoing mirror, the first speculum and the second speculum is coated with film, and described front cavity mirror surface is coated with the high-reflecting film of fundamental light wave section; Described outgoing mirror surface is coated with the part reflectance coating of fundamental light wave section, and described the first mirror surface is coated with fundamental light wave section high-reflecting film and frequency doubled light wave band anti-reflection film; Described the second mirror surface is coated with fundamental frequency light and frequency doubled light wave band high-reflecting film.
Between described vapour of an alkali metal pond and acoustooptic Q-switching, be placed with the first diaphragm, between described outgoing mirror and convex lens, be placed with the second diaphragm.
A kind of high repetition frequency royal purple laser, comprise: two groups of pump light source structures that formed by the coupled lens group of the Transmission Fibers of the LD pumping source of emission pump light, transmission pump light and coupling focal pumping light, pump light is converted to two vapour of an alkali metal ponds of fundamental frequency light, fundamental frequency light is played the resonant cavity of feedback regulation effect, and modulation produces the acoustooptic Q-switching of pulse fundamental frequency light and pulse fundamental frequency light is converted to the frequency-doubling crystal of royal purple frequency doubled light;
Described resonant cavity is the Z-type refrative cavity, mainly by two high reflection mirrors of the high reflection of fundamental frequency light, two polarizers that are used for separately fundamental frequency light and pump light, the first concave mirror and the second concave mirror that is used for output royal purple frequency doubled light are formed, described polarizer is placed between corresponding with it the coupled lens group and vapour of an alkali metal pond, its placement is to the pump light high transmission but to the high reflection of fundamental frequency light, and described frequency-doubling crystal is placed on the fundamental frequency light generation place with a tight waist between the first concave mirror and the second concave mirror;
The pump light of described LD pumping source emission exports described coupled lens group to by described Transmission Fibers, entered in the described vapour of an alkali metal pond by coupled lens group coupling focusing, make alkali metal atom produce effective population inversion, under the feedback effect of modulation that acousto-optic Q opens the light and Z-type refrative cavity, in the chamber, form the base frequency oscillation light of certain repetition rate, thereby make the frequency-doubling crystal that is positioned at base frequency oscillation beam waist place produce nonlinear effect, form the royal purple frequency doubled light and exported by the first concave mirror.
Between described vapour of an alkali metal pond and acoustooptic Q-switching, be placed with diaphragm.
Described coupled lens group mainly is comprised of first lens and the second lens, between described Transmission Fibers and polarizer.
The surface of described high reflection mirror, the first concave mirror and the second concave mirror is coated with film, and described high reflection mirror surface is coated with the high-reflecting film of fundamental light wave section; Described the first concave mirror surface is coated with the high-reflecting film of fundamental light wave section and the anti-reflection film of frequency doubled light wave band; Described the second concave mirror surface is coated with the high-reflecting film of fundamental frequency light and frequency doubled light wave band.
The invention has the beneficial effects as follows: the first technical scheme be with based on the alkali vapor laser of acousto-optic Q modulation as the fundamental frequency radiant, by the mode of round trip frequency multiplication outside the plano-convex unstable cavity chamber, obtain the royal purple laser of high repetition frequency output.Advantage is: 1) adopt the plano-convex unstable cavity structure, realize the large mode volume running of fundamental frequency light; 2) output of fundamental frequency light separates with the frequency multiplication process, has not only improved the stability of royal purple double-frequency laser output, has also made things convenient for debuging of royal purple laser; 3) obtain high repetition frequency alkali metal laser by acousto-optic Q modulation, have higher peak power, can in frequency-doubling crystal, produce high fundamental frequency optical power density; 4) the round trip frequency multiplication takes full advantage of fundamental frequency light outside the chamber, has high frequency-doubling conversion efficiency.
The second technical scheme adopts the Z-type refrative cavity, will based on the alkali vapor laser of acousto-optic Q modulation as the fundamental frequency radiant, by the mode of Z-type refrative cavity intracavity frequency doubling, obtain the royal purple laser of high repetition frequency output.Advantage is: adopt the Z-type refrative cavity, the Z-type refrative cavity is insensitive to little change of thermal effect and chamber shape, can realize the stable output of royal purple double-frequency laser.
Description of drawings
Fig. 1 is the structural representation of the high repetition frequency royal purple laser of employing plano-convex unstable cavity of the present invention;
Fig. 2 is the structural representation of the high repetition frequency royal purple laser in the two vapour of an alkali metal ponds of two LD pumping sources of employing plano-convex unstable cavity of the present invention;
Fig. 3 is the structural representation of the high repetition frequency royal purple laser of employing Z-type refrative cavity of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Embodiment one, as shown in Figure 1, the first technical scheme for a kind of high repetition frequency royal purple laser of the present invention, will be based on the alkali vapor laser of acousto-optic Q modulation as the fundamental frequency radiant, mode by round trip frequency multiplication outside the plano-convex unstable cavity chamber, obtain the royal purple laser of high repetition frequency output, this royal purple laser comprises pump light source structure, vapour of an alkali metal pond 7, resonant cavity, the first diaphragm 8, acoustooptic Q-switching 9, the second diaphragm 11, convex lens 12, the first speculum 13, the second speculum 15 and frequency-doubling crystal 14.
Pump light source structure in the present embodiment is comprised of Transmission Fibers 2 and the coupled lens group of LD pumping source 1, transmission pump light.
The pump light of LD pumping source 1 emission in the present embodiment is the linearly polarized light of p direction, enters the coupled lens group by Transmission Fibers 2 or alternate manner.
Coupled lens group in the present embodiment is comprised of first lens 3 and the second lens 4, is used for coupling focal pumping light, and pump light focuses in the vapour of an alkali metal pond 7 through the coupling of coupled lens group.
Vapour of an alkali metal pond 7 in the present embodiment is used for pump light is converted to fundamental frequency light, realize the fundamental frequency gain of light, be filled with an amount of vapour of an alkali metal and buffer gas in the vapour of an alkali metal pond 7, buffer gas is helium and ethane, the two ends window in vapour of an alkali metal pond 7 is coated with the high transmittance film of pump light and fundamental light wave section, and one end window is Brewster's angle, and the fundamental frequency light that forms in the plano-convex unstable cavity chamber like this is the linearly polarized light of s direction.
Resonant cavity in the present embodiment is L shaped plano-convex unstable cavity, fundamental frequency light is played the feedback regulation effect, and for realizing the output of fundamental frequency light, mainly by the front cavity mirror 5 of the high reflection of fundamental frequency light, the outgoing mirror 10 that is used for the polarizer 6 of separately fundamental frequency light and pump light and is used for output pulse fundamental frequency light are formed, front cavity mirror 5 is the aspheric surface planoconvex lens, and the surface is coated with the high-reflecting film of fundamental light wave section; Polarizer 6 is placed between described coupled lens group and the vapour of an alkali metal pond 7, and its placement is thoroughly high but high anti-to the fundamental frequency light of s direction polarization to the pump light of p direction polarization; Outgoing mirror 10 is placed between described acoustooptic Q-switching 9 and the convex lens 12, outgoing mirror 10 is level crossing, the surface is coated with the part reflectance coating of fundamental light wave section, forms fundamental frequency light between front cavity mirror 5 and outgoing mirror 10, and fundamental frequency light exports to for the convex lens 12 that converge fundamental frequency light by outgoing mirror 10.
9 pairs of fundamental frequency light of acoustooptic Q-switching in the present embodiment are modulated and are produced pulse fundamental frequency light, acoustooptic Q-switching 9 is used for realizing the output of fundamental frequency light high repetition frequency, acoustooptic Q-switching 9 is placed between vapour of an alkali metal pond 7 and the outgoing mirror 10, acoustooptic Q-switching 9 makes the royal purple laser works transfer the Q state, between acoustooptic Q-switching 9 and vapour of an alkali metal pond 7, be placed with the first diaphragm 8, with the Edge Oscillation of restriction fundamental frequency light in the plano-convex unstable cavity chamber, thereby improve fundamental frequency light beam mode.
Convex lens 12 in the present embodiment are used for converging pulse fundamental frequency light, convex lens 12 converge pulse fundamental frequency light in frequency-doubling crystal 14, place one between frequency-doubling crystal 14 and the convex lens 12 and be the first plane mirror 13 of 45 ° with pulse fundamental frequency light light path, its surface is coated with the high-reflecting film of fundamental light wave section and the anti-reflection film of frequency doubled light wave band.
Frequency-doubling crystal 14 in the present embodiment can be converted to the royal purple frequency doubled light with pulse fundamental frequency light, and the other end of frequency-doubling crystal 14 is placed with the second speculum 15 with pulse fundamental frequency light light path parallel, and its surface is coated with the high-reflecting film of fundamental frequency light and frequency doubled light wave band.
Be placed with the second diaphragm 11 between outgoing mirror 10 in the present embodiment and the convex lens 12, its effect is to prevent that the fundamental frequency light that is reflected back in the round trip frequency multiplication process outside the chamber from entering plano-convex unstable cavity, improves the job stability of fundamental frequency light.
The pump light of LD pumping source 1 emission in the present embodiment exports the coupled lens group to by Transmission Fibers 2, entered in the vapour of an alkali metal pond 7 by coupled lens group coupling focusing, make alkali metal atom produce effective population inversion, under the feedback effect of the modulating action resonant cavity of acoustooptic Q-switching 9, produce the pulse fundamental frequency light of certain repetition rate, pulse fundamental frequency light by outgoing mirror 10 outputs is focused on by convex lens 12 and is entered in the frequency-doubling crystal 14 by 13 reflections of the first speculum, pulse fundamental frequency light partly is converted to the royal purple frequency doubled light, remaining fundamental frequency light is entered in the frequency-doubling crystal 14 by 15 reflections of the second speculum again, thereby takes full advantage of the fundamental frequency light energy to obtain maximum shg efficiency.Like this pulse fundamental frequency light in the frequency doubling cavity that is consisted of by the first plane mirror 13 and the second plane mirror 15 twice by frequency-doubling crystal 14, thereby round trip frequency multiplication outside the realization chamber, produce the royal purple frequency doubled light by frequency-doubling crystal 14, the royal purple frequency doubled light is through 13 outputs of the first speculum.
The pump light of LD pumping source 1 emission in the present embodiment has multiple possibility, can emission wavelength be the pump light of 766 .7nm, 780 .2nm or 852 .3nm, which kind of pump light the pumping wavelength of potassium steam, rubidium steam and these the three kinds of laser mediums of caesium steam in the corresponding vapour of an alkali metal pond 7 is launched and is decided according to the vapour of an alkali metal laser medium in the vapour of an alkali metal pond 7 respectively.
770.1 nm, 795.0 nm that produced by acoustooptic Q-switching 9 modulation in the present embodiment or the pulse fundamental frequency light of 894.6 nm, respectively potassium steam, rubidium steam and the three kinds of laser mediums of caesium steam in the corresponding vapour of an alkali metal pond 7.
The royal purple frequency multiplication light wavelength of the royal purple laser output in the present embodiment can be 385.0 nm, 397.5 nm or 447.3 nm, respectively corresponding potassium laser, rubidium laser and these three kinds of fundamental frequency light of caesium laser.
Take rubidium vapor laser medium as example, the specific works process of the described royal purple laser of present embodiment is: 780.2 nm pump lights of LD pumping source 1 emission are through Transmission Fibers 2 outputs, entered in the rubidium steam pond by first lens 3 and the 4 coupling focusing of the second lens, under the pumping incentive action, realize the number of effective particles counter-rotating of rubidium steam atom, under the feedback effect of the modulating action resonant cavity of acoustooptic Q-switching 9, produce 795 .0nm pulse rubidium laser by certain repetition rate output, pulse rubidium laser is focused on by convex lens 12 and enters in the frequency-doubling crystal 14, produce the nonlinear effect effect in frequency-doubling crystal 14, last output wavelength is the royal purple frequency doubled light of 397.5 nm.
Embodiment two, as shown in Figure 2, on the first technical scheme basis shown in Figure 1, between above-mentioned acoustooptic Q-switching 9 and outgoing mirror 10, increase a vapour of an alkali metal pond 7, a polarizer 6 and one group of pump light source structure, place near described acoustooptic Q-switching 9 in vapour of an alkali metal pond 7, the pump light source structure is placed near described outgoing mirror 10, increase the power output of alkali metal laser by the injection pump power that increases the gain volume and improve LD, identical in the function that the royal purple laser in the present embodiment is realized and the embodiment one.
The function of the polarizer 6 in the present embodiment, vapour of an alkali metal pond 7 and pump light source structure and form all with the first technical scheme in said identical.
Be placed with the 3rd diaphragm 16 between the vapour of an alkali metal pond 7 of acoustooptic Q-switching 9 in the present embodiment and increase.
Take potassium vapor laser medium as example, the specific works process of the described royal purple laser of present embodiment is: 766.7 nm pump lights by 1 emission of LD pumping source are exported through Transmission Fibers 2, enter potassium steam pond from the plano-convex unstable cavity two ends by first lens 3 and the 4 coupling focusing of the second lens, under the pumping incentive action, realize the number of effective particles counter-rotating of potassium steam atom, under the feedback effect of the modulating action resonant cavity of acoustooptic Q-switching 9, produce 770.1 nm pulse potassium laser by certain repetition rate output, pulse potassium laser is focused on by convex lens 12 and enters in the frequency-doubling crystal 14, produce the nonlinear effect effect in frequency-doubling crystal 14, last output wavelength is the royal purple frequency doubled light of 385.0 nm.
Embodiment three, as shown in Figure 3, the second technical scheme for a kind of high repetition frequency royal purple laser of the present invention, with embodiment one described the first technical scheme be technical scheme arranged side by side, this technical scheme adopts the Z-type refrative cavity, will be based on the alkali vapor laser of acousto-optic Q modulation as the fundamental frequency radiant, mode by Z-type refrative cavity intracavity frequency doubling, obtain the royal purple laser of high repetition frequency output, this royal purple laser comprises: two groups of pump light source structures, two vapour of an alkali metal ponds 7, resonant cavity, acoustooptic Q-switching 9 and frequency-doubling crystal 11;
Pump light source structure in the present embodiment is two groups, every group of pump light source structure includes the LD pumping source 1 for the emission pump light, the coupled lens group that is used for transmitting the Transmission Fibers 2 of pump light and is used for coupling focal pumping light, and the Z-type refrative cavity is between two groups of pump light source structures.
The pump light of LD pumping source 1 emission in the present embodiment is the linearly polarized light of p direction, enters the coupled lens group by Transmission Fibers 2 or alternate manner.
Coupled lens group in the present embodiment is comprised of first lens 3 and the second lens 4, is used for coupling focal pumping light, and pump light focuses in the vapour of an alkali metal pond 7 through the coupling of coupled lens group.
Vapour of an alkali metal pond 7 quantity in the present embodiment are two, receive respectively the pump light from two pump light source structures, be used for pump light is converted to fundamental frequency light, realize the fundamental frequency gain of light, be filled with an amount of vapour of an alkali metal and buffer gas in each vapour of an alkali metal pond 7, buffer gas is helium and ethane, the two ends window in vapour of an alkali metal pond 7 is coated with the high transmittance film of pump light and fundamental light wave section, and an end window wherein is Brewster's angle, and the fundamental frequency light that forms in Z-type refrative cavity chamber like this is the linearly polarized light of s direction.
Resonant cavity in the present embodiment is the Z-type refrative cavity, fundamental frequency light is played the feedback regulation effect, and for realizing the output of fundamental frequency light, mainly by two high reflection mirrors 5 of the high reflection of fundamental frequency light, two polarizers 6 that are used for separately fundamental frequency light and pump light, the first concave mirror 10 and the second concave mirror 12 that is used for output royal purple frequency doubled light are formed, high reflection mirror 5 surfaces are coated with the high-reflecting film of fundamental light wave section; Polarizer 6 is placed between corresponding with it the coupled lens group and vapour of an alkali metal pond 7, and its placement is thoroughly high but high anti-to the fundamental frequency light of s direction polarization to the pump light of p direction polarization; The first concave mirror 10 surfaces are coated with the high-reflecting film of fundamental light wave section and the anti-reflection film of frequency doubled light wave band; The second concave mirror 12 surfaces are coated with the high-reflecting film of fundamental frequency light and frequency doubled light wave band, form fundamental frequency light between two high reflection mirrors 5.
Frequency-doubling crystal 11 in the present embodiment is placed on formed fundamental frequency light generation place with a tight waist between the first concave mirror 10 and the second concave mirror 12, further improved the power density of pulse fundamental frequency light in frequency-doubling crystal 11, fundamental frequency light generation position with a tight waist is to determine by the radius of curvature of the first concave mirror 10 and the second concave mirror 12 is big or small.
9 pairs of fundamental frequency light of acoustooptic Q-switching in the present embodiment are modulated and are produced pulse fundamental frequency light, acoustooptic Q-switching 9 is used for realizing the high repetition frequency vibration of fundamental frequency light, acoustooptic Q-switching 9 is placed between vapour of an alkali metal pond 7 and the first concave mirror 10, acoustooptic Q-switching 9 makes the royal purple laser works transfer the Q state, between acoustooptic Q-switching 9 and vapour of an alkali metal pond 7, be placed with diaphragm 8, with the Edge Oscillation of restriction fundamental frequency light in Z-type refrative cavity chamber, thereby improve fundamental frequency light beam mode.
The pump light of LD pumping source 1 emission in the present embodiment exports the coupled lens group to by Transmission Fibers 2, entered in the vapour of an alkali metal pond 7 by coupled lens group coupling focusing, make alkali metal atom produce effective population inversion, under the feedback effect of the modulation resonant cavity of acoustooptic Q-switching 9, in the chamber, form the base frequency oscillation light of certain repetition rate, thereby make the frequency-doubling crystal 11 that is positioned at base frequency oscillation beam waist place produce nonlinear effect, form the royal purple frequency doubled light by 10 outputs of the first concave mirror.The pump light of LD pumping source 1 emission in the present embodiment has multiple possibility, can emission wavelength be the pump light of 766 .7nm, 780.2 nm or 852.3 nm, which kind of pump light the pumping wavelength of potassium steam, rubidium steam and these the three kinds of laser mediums of caesium steam in the corresponding vapour of an alkali metal pond 7 is launched and is decided according to the vapour of an alkali metal laser medium in the vapour of an alkali metal pond 7 respectively.
770.1 nm, 795.0 nm that produced by acoustooptic Q-switching 9 modulation in the present embodiment or the pulse fundamental frequency light of 894.6 nm, respectively potassium steam, rubidium steam and the three kinds of laser mediums of caesium steam in the corresponding vapour of an alkali metal pond 7.
The royal purple frequency multiplication light wavelength of the royal purple laser output in the present embodiment can be 385.0 nm, 397.5 nm or 447 .3nm, respectively corresponding potassium laser, rubidium laser and these three kinds of fundamental frequency light of caesium laser.
Take caesium vapor laser medium as example, the specific works process of the described royal purple laser of present embodiment is: 852.3 nm pump lights by 1 emission of LD pumping source are exported through Transmission Fibers 2, enter into two caesium steam ponds from Z-type refrative cavity two ends by first lens 3 and the 4 coupling focusing of the second lens, under the pumping incentive action, realize the number of effective particles counter-rotating of caesium steam atom, act on the high repetition frequency vibration that realizes 894.6 nm caesium laser in the chamber by the modulation of acoustooptic Q-switching 9 and the feedback oscillation of Z-type refrative cavity, pulse fundamental frequency light produces the nonlinear effect effect in frequency-doubling crystal 11, last is the royal purple frequency doubled light of 447 .3nm by the first concave mirror 10 output wavelengths.
The royal purple laser of a kind of high repetition frequency provided by the invention still finds no the same or analogous record with the present invention through consulting interrelated data.Table 1 is depicted as in the royal purple laser of the present invention, every kind of long and final royal purple frequency doubled light wavelength that obtains of pump light wavelength, fundamental light wave that vapour of an alkali metal laser medium difference is corresponding.
Table 1
| Alkali metal | Pump light/nm | Fundamental frequency light/nm | Frequency doubled light/nm |
| K | 766.7 | 770.1 | 385.0 |
| Rb | 780.2 | 795.0 | 397.5 |
| Cs | 852.3 | 894.6 | 447.3 |
Claims (10)
1. a high repetition frequency royal purple laser is characterized in that, comprising:
The pump light source structure that is formed by the coupled lens group of the LD pumping source (1) of emission pump light, the Transmission Fibers (2) of transmission pump light and the focal pumping light that is coupled, pump light is converted to the vapour of an alkali metal pond (7) of fundamental frequency light, resonant cavity, modulation produces the acoustooptic Q-switching (9) of pulse fundamental frequency light, converge the convex lens (12) of pulse fundamental frequency light, be the first speculum (13) of 45 ° with pulse fundamental frequency light light path, with second speculum (15) of pulse fundamental frequency light light path parallel with pulse fundamental frequency light is converted to the frequency-doubling crystal (14) of royal purple frequency doubled light;
Described resonant cavity is plano-convex unstable cavity, mainly by the front cavity mirror (5) of the high reflection of fundamental frequency light, the outgoing mirror (10) that is used for the polarizer (6) of separately fundamental frequency light and pump light and is used for output pulse fundamental frequency light are formed, described polarizer (6) is placed between described coupled lens group and vapour of an alkali metal pond (7), its placement is to the pump light high transmission but to the high reflection of fundamental frequency light, described outgoing mirror (10) is placed between described acoustooptic Q-switching (9) and the convex lens (12);
The pump light of described LD pumping source (1) emission exports described coupled lens group to by described Transmission Fibers (2), entered in the described vapour of an alkali metal pond (7) by coupled lens group coupling focusing, make alkali metal atom produce effective population inversion, under the feedback effect of the modulating action of acoustooptic Q-switching (9) and plano-convex unstable cavity, produce the pulse fundamental frequency light of certain repetition rate, pulse fundamental frequency light by outgoing mirror (10) output is focused on by convex lens (12) and is entered in the frequency-doubling crystal (14) by the first speculum (13) reflection, pulse fundamental frequency light partly is converted to the royal purple frequency doubled light, remaining fundamental frequency light is entered in the frequency-doubling crystal (14) by the second speculum (15) reflection again, thereby take full advantage of the fundamental frequency light energy and obtain maximum shg efficiency, final royal purple frequency doubled light is exported through the first speculum (13).
2. a kind of high repetition frequency royal purple laser according to claim 1, it is characterized in that, between described acoustooptic Q-switching (9) and outgoing mirror (10), increase a vapour of an alkali metal pond (7), a polarizer (6) and one group of pump light source structure, place near described acoustooptic Q-switching (9) in described vapour of an alkali metal pond (7), and described pump light source structure is placed near described outgoing mirror (10).
3. a kind of high repetition frequency royal purple laser according to claim 2 is characterized in that, is placed with the 3rd diaphragm (16) between a vapour of an alkali metal pond (7) of described acoustooptic Q-switching (9) and increase.
4. a kind of high repetition frequency royal purple laser according to claim 1 is characterized in that, described coupled lens group mainly is comprised of first lens (3) and the second lens (4), is placed between described Transmission Fibers (2) and the polarizer (6).
5. a kind of high repetition frequency royal purple laser according to claim 1, it is characterized in that, the surface of described front cavity mirror (5), outgoing mirror (10), the first speculum (13) and the second speculum (15) is coated with film, and described front cavity mirror (5) surface is coated with the high-reflecting film of fundamental light wave section; Described outgoing mirror (10) surface is coated with the part reflectance coating of fundamental light wave section, and described the first speculum (13) surface is coated with fundamental light wave section high-reflecting film and frequency doubled light wave band anti-reflection film; Described the second speculum (15) surface is coated with fundamental frequency light and frequency doubled light wave band high-reflecting film.
6. a kind of high repetition frequency royal purple laser according to claim 1, it is characterized in that, between described vapour of an alkali metal pond (7) and acoustooptic Q-switching (9), be placed with the first diaphragm (8), between described outgoing mirror (10) and convex lens (12), be placed with the second diaphragm (11).
7. high repetition frequency royal purple laser, it is characterized in that, comprise: two groups of pump light source structures that formed by the coupled lens group of the LD pumping source (1) of emission pump light, the Transmission Fibers (2) of transmission pump light and the focal pumping light that is coupled, pump light is converted to two vapour of an alkali metal ponds (7) of fundamental frequency light, fundamental frequency light is played the resonant cavity of feedback regulation effect, and modulation produces the acoustooptic Q-switching (9) of pulse fundamental frequency light and pulse fundamental frequency light is converted to the frequency-doubling crystal (11) of royal purple frequency doubled light;
Described resonant cavity is the Z-type refrative cavity, mainly by two high reflection mirrors (5) to the high reflection of fundamental frequency light, be used for separating two polarizers (6) of fundamental frequency light and pump light, the first concave mirror (10) and the second concave mirror (12) that are used for output royal purple frequency doubled light form, described polarizer (6) is placed between corresponding with it the coupled lens group and vapour of an alkali metal pond (7), its placement is to the pump light high transmission but to the high reflection of fundamental frequency light, and described frequency-doubling crystal (11) is placed on the fundamental frequency light generation place with a tight waist between the first concave mirror (10) and the second concave mirror (12);
The pump light of described LD pumping source (1) emission exports described coupled lens group to by described Transmission Fibers (2), entered in the described vapour of an alkali metal pond (7) by coupled lens group coupling focusing, make alkali metal atom produce effective population inversion, under the feedback effect of the modulation of acoustooptic Q-switching (9) and Z-type refrative cavity, in the chamber, form the base frequency oscillation light of certain repetition rate, make the frequency-doubling crystal (11) that is positioned at base frequency oscillation beam waist place produce nonlinear effect, form the royal purple frequency doubled light and exported by the first concave mirror (10).
8. a kind of high repetition frequency royal purple laser according to claim 7 is characterized in that, is placed with diaphragm (8) between described vapour of an alkali metal pond (7) and acoustooptic Q-switching (9).
9. a kind of high repetition frequency royal purple laser according to claim 7 is characterized in that, described coupled lens group mainly is comprised of first lens (3) and the second lens (4), is positioned between described Transmission Fibers (2) and the polarizer (6).
10. a kind of high repetition frequency royal purple laser according to claim 7, it is characterized in that, the surface of described high reflection mirror (5), the first concave mirror (10) and the second concave mirror (12) is coated with film, and described high reflection mirror (5) surface is coated with the high-reflecting film of fundamental light wave section; Described the first concave mirror (10) surface is coated with the high-reflecting film of fundamental light wave section and the anti-reflection film of frequency doubled light wave band; Described the second concave mirror (12) surface is coated with the high-reflecting film of fundamental frequency light and frequency doubled light wave band.
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| CN110265862A (en) * | 2019-07-10 | 2019-09-20 | 长春新产业光电技术有限公司 | A kind of laser of high light beam quality |
| CN110277726A (en) * | 2019-07-11 | 2019-09-24 | 长春新产业光电技术有限公司 | A kind of acousto-optic Q modulation ultraviolet laser |
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