CN102723659B - Method for generation of long-span repetition frequency jumping Q-switched laser pulses - Google Patents
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Abstract
The invention discloses a method for generation of long-span repetition frequency jumping Q-switched laser pulses, belonging to a laser technical field. According to the invention, the long-span repetition frequency jumping Q-switched laser pulse sequences are generated by controlling pumping pulse sequences and Q-switched pulse sequences which are acted on the Q-switched laser. Widths of the pumping pulses in the pump pulse sequences are different. One pumping pulse can correspond to one Q-switched pulse in one Q-switched pulse sequence, and can further correspond to multiple Q-switched pulses. The long-span repetition frequency jumping Q-switched laser pulse sequences obtained by utilizing the method provided in the invention comprise laser pulses with different repetition frequencies, and the repetition frequencies have large span and are capable of jumping.
Description
Technical field
The present invention relates to laser technique field, relate in particular to a kind of laser pulse with different repetition rates that comprises, the adjustable Q laser pulse production method of large and the large span repetition transition that can transition of repetition rate span.
Background technology
Laser Q-switching technology is that whole energy compressions of laser are launched in the extremely narrow pulse of width, thereby make the luminous peak power of laser improve a kind of technology of several orders of magnitude, after laser Q-switching technology proposed from 1961, develop very rapidly, will obtain now peak power in MW class (10
6w) above, pulse duration is nanosecond (10
-9s) laser pulse is not difficult.In existing Q-regulating technique, the repetition rate of the Q impulse providing is all generally single, and the repetition rate of the adjustable Q laser pulse that laser produces is also certain.
The Q-switched laser using at present or adopt the mode of continuous pumping, or adopt the mode of pulse pump.With the laser of continuous pump mode work, be generally operational in high repetition frequency state, consider the demand of pumping source heat radiation, and the stability of laser Output of laser, pump power can not be too large, and corresponding, the single pulse energy of the output optical pulse of laser is all smaller; With the laser of pulse pump mode work, be generally operational in low-repetition-frequency state, because pumping source is not to work always, therefore, can within the time of pumping effect, provide higher pump power, and overall pump power maintains a lower level.
Q-switched laser with continuous pump mode work, by controlling the repetition rate of Q impulse, can realize the pulse that comprises multiple repetition rate in adjustable Q laser pulse sequence, but be subject to the restriction of pump power, the single pulse energy of each laser pulse can be smaller.Q-switched laser with the work of pulse pump mode, by controlling the time interval between pumping pulse and corresponding Q impulse, also can realize the laser pulse that contains different time interval in adjustable Q laser pulse sequence, contain different repetition rates, and the single pulse energy of each pulse is larger, but, consider the requirement of laser heat radiation and the stability of Laser output, the time interval of two adjustable Q laser pulses can not be too small, therefore, profit can not make the laser pulse that contains upper frequency in the adjustable Q laser pulse of laser output in this way.
With the Q-switched laser of continuous pump mode work, can export the laser of higher repetitive frequency, but the single pulse energy of laser is lower, by increasing pumping light power, can improve the laser single-pulse energy of laser output, but this is that the requirement meeting of the heat radiation of system and job stability is increased thereupon, make laser become huge, complicated.Q-switched laser with the work of pulse pump mode, increase the average light power of pump light and take more effective cooling measure, also can be so that the repetition rate of output Q-switched laser pulse increase, but this increases the requirement of entire system stability equally, makes laser become huge, complicated.
To sum up, existing Q-switched pulse laser or be operated in compared with low-repetition-frequency, state that single pulse energy is larger, or be operated in high repetition frequency, the state that single pulse energy is less.Realize and in the laser pulse of same laser output, contain the laser pulse that repetition rate is higher, single pulse energy is larger and can make laser become huge, complicated.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how to keep under the prerequisite of the existing scale of laser, realize in the output sequence of same laser and both contained the laser pulse compared with low-repetition-frequency, the laser pulse that contains again higher repetitive frequency, the single pulse energy of all laser pulses is all larger, and the repetition rate of laser pulse can realize the transition of large span.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of adjustable Q laser pulse production method of large span repetition transition, by control action in pumping pulse sequence and the Q impulse sequence of Q-switched laser, produce the adjustable Q laser pulse sequence of large span repetition transition, wherein, in the adjustable Q laser pulse sequence of described large span repetition transition, comprise the laser pulse with different repetition rates, repetition rate can transition.
Preferably, the pumping pulse width in described pumping pulse sequence is not identical, Q impulse or corresponding a plurality of described Q impulses in a corresponding described Q impulse sequence of pumping pulse.
Preferably, when by the narrow pumping pulse of a corresponding Q impulse in described pumping pulse sequence, while acting on Q-switched laser with corresponding low frequency Q impulse, after described narrow pumping pulse effect cut-off, postpone a period of time, more described low frequency Q impulse is added to described Q-switched laser.A corresponding low frequency Q impulse of narrow pumping pulse.
Preferably, the size of the time postponing is determined by the upper level lifetime of laser medium and the radiated time characteristic of pumping source.
Preferably, when the wide pumping pulse of a plurality of Q impulses of correspondence and corresponding high frequency Q impulse are acted on to Q-switched laser, described wide pumping pulse acts on described Q-switched laser always, when the inverted population of the upper and lower energy of laser inter-stage reaches maximum, a high frequency Q impulse is added to described Q-switched laser at every turn.The corresponding a plurality of described high frequency Q impulses of wide pumping pulse.
Preferably, the pulse spacing of described high frequency Q impulse is while being more than or equal to the upper level lifetime of laser medium, and the single pulse energy of the laser pulse of the high repetition frequency of corresponding described Q-switched laser output does not change with the variation of described high frequency Q impulse frequency.
Preferably, the time interval that described high frequency Q impulse is added to described Q-switched laser is while being less than the upper level lifetime of laser medium, the single pulse energy of the laser pulse of the high repetition frequency of corresponding described Q-switched laser output changes with the variation of described high frequency Q impulse frequency, and the time interval is less, in described Q-switched laser output laser pulse sequence, single pulse energy is less.
Preferably, when described narrow pumping pulse and described low frequency Q impulse are acted on to Q-switched laser, by reducing the pulse duration of described narrow pumping pulse, reduce the size of single pulse energy in the laser pulse sequence of described Q-switched laser output when the work of low repetition state.
(3) beneficial effect
The present invention is by the design pumping pulse of pumping source and the control impuls of Q-switch, proposed both to have comprised in a kind of laser pulse sequence that can allow a laser export the pulse train of low repetition, the method that comprises again the pulse train of high repetition, by the adjustment to pumping pulse and Q impulse, can make laser not increase under the prerequisite of scale and system complexity, the low repetition pulse of output is suitable with the peak power of high repetition pulse, certainly, by controlling Q impulse, also can make the two difference to some extent.
Accompanying drawing explanation
Fig. 1 is pumping pulse, the Q impulse using in the method according to the embodiment of the present invention and the corresponding Laser output pulse schematic diagram that produces, and wherein, the high repetition of exporting is suitable with the single pulse energy of low Repetition Frequency Laser pulse;
Fig. 2 is pumping pulse, the Q impulse using in the method according to the embodiment of the present invention and the corresponding Laser output pulse schematic diagram that produces, wherein, by reducing the width of narrow pumping pulse, make the single pulse energy of exported low Repetition Frequency Laser pulse less than high repetition; And
Fig. 3 is pumping pulse, the Q impulse using in the method according to the embodiment of the present invention and the corresponding Laser output pulse schematic diagram that produces, wherein, by improving the frequency of high frequency Q impulse corresponding to wide pumping pulse, make the single pulse energy of exported high Repetition Frequency Laser pulse less than low repetition.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
The laser pulse production method of the large span repetition transition of the embodiment of the present invention, pumping pulse sequence and corresponding Q impulse sequence are acted on to Q-switched laser, to produce laser pulse sequence, in described laser pulse sequence, comprise the pulse train with different repetition rates, wherein, described pumping pulse sequence comprises narrow pumping pulse and the wider wide pumping pulse of pulsewidth that pulsewidth is narrower, and described Q impulse sequence comprises low frequency Q impulse and the higher high frequency Q impulse of frequency that frequency is lower.
The pulse spacing of high frequency Q impulse is not less than the life-span of energy level on laser medium, to obtain larger single pulse energy, the upper level lifetime that is to say laser medium has determined the upper frequency limit of laser single-pulse energy corresponding high repetition Q impulse when larger, when Q impulse frequency limits higher than this, the single pulse energy of laser output can reduce, and the frequency of Q impulse is higher, and single pulse energy is just less, under the Q impulse effect of same pulse width, pulse peak power is just lower.
The used time is done in narrow pumping pulse, make the single pulse energy of laser output laser pulse maximum, corresponding minimum pumping pulse width is determined by pulse pump speed and laser medium upper level lifetime, when narrow pumping pulse width is greater than this minimum widith, the single pulse energy of output is all roughly the same, when narrow pumping pulse width is less than this minimum widith, the laser single-pulse energy of laser output declines, and narrow pumping pulse width is narrower, the low repetition single pulse energy of laser output is lower.
The used time is done in wide pumping pulse, the frequency of the Q impulse that the energy of laser output pulse is corresponding with wide pumping pulse is relevant, Q impulse frequency is higher, the single pulse energy of laser output is less, otherwise, q-frequency is lower, laser single-pulse energy is just larger, but when the frequency of Q impulse reaches a certain value, reduce again pulse frequency, the energy of single laser pulse can not increase yet again, the frequency that is Q impulse has a critical value, this critical value is mainly determined by the life-span of energy level on pumping rate and laser medium, although the pulse duration of Q impulse can exert an influence to this value, but because Q impulse width is generally far smaller than the width of pumping pulse, so the impact that it produces is negligible.
The pulse duration of laser output pulse can be by regulating the width of Q impulse, the time that particularly changes Q impulse rising edge changes, Q impulse pulsewidth is wider, rising time is longer, laser output laser pulse width is just wider, when Q impulse pulsewidth is very narrow, adjust Q pulsewidth to strengthen, laser pulse width increases thereupon, but when adjusting Q pulsewidth to increase to a certain critical value, the pulsewidth of laser pulse increases with regard to the increase with Q impulse pulsewidth no longer, this critical value is for the pulse tuning Q laser of laser medium energy storage, by light pulse, in resonant cavity, formed and export needed Time dependent, for resonant cavity energy storage, it is " cavity dumping " formula laser, by laser pulse, in resonant cavity, export required Time dependent.Certainly, if extend the opening time (rising edge of corresponding Q impulse) of Q switching, the width of laser pulse can increase and increase along with Q switching open-interval.
Below in conjunction with accompanying drawing, illustrate embodiments of the invention.
Fig. 1 is pumping pulse, the Q impulse using in the method according to the embodiment of the present invention and the corresponding Laser output pulse schematic diagram that produces, and wherein, the high repetition of exporting is suitable with the single pulse energy of low Repetition Frequency Laser pulse.A kind of pumping pulse W using in 1 method proposing for the present invention in figure
p, 2 are and W
pcorresponding Q impulse Q
1, 3 is at W
pand Q
1under common effect, the laser pulse φ of laser output
1, pumping pulse W
pact on laser gain unit 6, corresponding Q impulse Q
1act on and adjust Q unit 5.
Completely reflecting mirror 4 and outgoing mirror 7 forms resonant cavitys, and when Q impulse is during in low level, the loss of resonator is very large, Q value is very low, and laser generation threshold value is high, in this state, the effect of pumping pulse makes laser medium energy storage, and the inverted population of the upper and lower energy level of laser increases.When Q impulse is high level, the loss of laserresonator reduces, and Q value raises, and laser generation threshold value reduces, and laser generation is set up rapidly, and by the laser pulse 8 of outgoing mirror 7 outputs as shown in 3.
Pumping pulse W
pbe divided into two types, a kind of is the narrow pumping pulse of pulsewidth narrower (being that pumping is shorter action time), and another kind is the wide pumping pulse of pulsewidth wider (being pumping shorter length action time); Corresponding Q impulse Q
1also comprise respectively two types, a kind of is the pulse that frequency is lower, another kind is the pulse that frequency is higher, low frequency Q impulse is corresponding with narrow pumping pulse, a corresponding low frequency Q impulse of burst pulse pumping pulse, high frequency Q impulse is corresponding with wide pumping pulse, the corresponding a plurality of high frequency Q impulses of wide pumping pulse.The pulsewidth of laser output laser pulse is relevant to the pulsewidth of Q impulse (the particularly action time of rising edge), adjust Q pulsewidth wider, rising edge is longer action time, the pulsewidth of laser pulse is also wider, under the effect of identical pumping pulse, adjust Q pulsewidth to increase, the peak power reduction of laser pulse.
The used time is done in each narrow pumping pulse, pump light is pumped into upper laser level by ground state particle, under pumping pulse effect, ground state particle is pumped into upper laser level, carrying out along with pumping effect, the population of upper laser level is more and more, upper and lower level inversion population increases, but be subject to particle in the age limit of upper laser level, particle can not occupy energy level for a long time, when the time that particle occupies at upper energy level is greater than energy level particle age, be excited particle meeting spontaneous radiation to laser lower level, cause the inverted population of upper and lower energy inter-stage to decline, visible, carrying out along with pumping pulse, ground state particle is constantly pumped into upper laser level, the inverted population of the upper and lower energy level of laser is increased, simultaneously, when pumping effect surpasses certain hour limit, the particle of upper laser level can because the time that occupies energy level surpasses the life-span of upper energy level particle, laser lower level be arrived in spontaneous radiation, cause population upset to decline, therefore, can predict, after pumping effect a period of time, the laser up and down inverted population of energy inter-stage will reach maximum, form saturated, therefore, when narrow pumping pulse width selects upper and lower level inversion population just to reach capacity the corresponding time, both can obtain maximum inverted population, realize maximum laser single-pulse energy output.
When narrow pumping pulse finishes, because the radiation of pumping source has the hysteresis of certain hour with respect to pumping pulse, therefore, during pumping pulse cut-off, corresponding Q impulse is not to add up immediately, but postpone a period of time, when in laser medium, upper and lower level inversion population reaches maximum by the time, Q impulse is added, the Q value of resonant cavity is raise suddenly, cavity loss declines rapidly, and laser goes out photo threshold significantly to be reduced, an adjustable Q laser pulse of laser output.
The used time is done in wide pumping pulse, pump light is pumped into upper laser level by ground state particle, along with the pumping increase of action time, upper laser level accumulates to such an extent that population is more and more, the inverted population of energy inter-stage is along with increase up and down, when the inverted population of upper and lower energy inter-stage reaches maximum, Q impulse arrives, the Q value of laserresonator raises suddenly, loss declines, laser goes out photo threshold to be reduced, a laser pulse of laser output, because Q impulse is done the used time, it is maximum that the upper and lower level inversion population of laser has reached, it is maximum that the namely energy storage of laser medium reaches, therefore, the laser pulse of output is identical with the single pulse energy of the laser pulse of exporting under narrow pumping pulse effect, if the pulsewidth of the low frequency Q impulse that the pulsewidth of Q impulse is corresponding with burst pulse pumping identical (particularly rising time is identical), so, the peak power of output laser pulse is also identical, because pumping effect is being carried out always, so after Q impulse effect, the Q value of resonant cavity reduces, loss increases, laser goes out photo threshold and increases, laser medium is again in energy storage state, the laser up and down inverted population of energy inter-stage starts again to increase, when inverted population increases to maximum, next Q impulse arrives, laser is exported again a laser pulse, because pumping pulse starts to be applied to the reversion of the upper and lower energy level population of laser, reach the maximum time used and determined by the upper laser level life-span, this time is very short, therefore under wide pumping pulse effect, laser can be exported the very laser pulse of high repetition frequency, take Nd:YAG as example, the repetition of high-peak power macro-energy pulse tuning Q laser general work is below 100Hz, the life-span of upper laser level is 230us, the corresponding pumping time is suitable with it, also get 230us, under wide pumping pulse effect, the repetition of corresponding Q impulse is 4.347KHz, so Nd:YAG laser is under pumping pulse of the present invention and corresponding Q impulse acting in conjunction, can realize low repetition (100Hz is following) and high repetition (4.3KHz left and right) laser pulse exports in same Laser output pulse train, visible laser repetition span is very large.
Under the effect of wide pumping pulse, because pump pulse duration is long, it is much bigger that the heat producing in laser is done the used time than burst pulse, it is much serious that thermal effect in the laser medium causing thus is also done the used time than narrow pumping pulse, and, pumping acting duration is longer, the heat gathering in laser is larger, thermal effect is more serious on the impact of laser, so, the pulse duration of wide pumping pulse can not be too wide, and time ratio shared in whole pumping pulse sequence can not be too large, its concrete numerical value will be subject to the restriction of laser concrete structure and heat dispersion, in the wide pumping pulse width of design and the time in pumping pulse sequence thereof during proportioning, also to consider the concrete application requirements of laser.
Fig. 2 is pumping pulse, the Q impulse using in the method according to the embodiment of the present invention and the corresponding Laser output pulse schematic diagram that produces, wherein, by reducing the width of narrow pumping pulse, make the single pulse energy of exported low Repetition Frequency Laser pulse less than high repetition.The used time is done in narrow pumping pulse, because the peak power of laser Emission Lasers pulse is relevant action time with pumping, when pumping length action time reaches when the upper and lower level inversion population of laser medium is reached capacity, the single pulse energy of the laser pulse of laser output reaches maximum, if adjust Q pulsewidth consistent, corresponding single laser pulse peak power also reaches maximum; And when the pulse duration of pumping pulse reduces, pumping deficiency action time is so that the inverted population of the upper and lower energy level of laser medium reaches maximum, therefore, when Q impulse arrives, the single pulse energy of the laser pulse of laser output can reduce, and corresponding peak power also can decline, in pumping pulse 9 in Fig. 2, the width of burst pulse is less than saturated width, so under the effect of corresponding Q impulse 2, the laser pulse sequence of output is as shown in 10.And the pulse duration of narrow pumping pulse is narrower, i.e. pumping is shorter action time, and the single pulse energy of laser output laser pulse also can be less, adjusts in the situation that Q pulsewidth is consistent, and the peak power of corresponding laser pulse will be lower.Utilize this characteristic, can be by shortening the pulse duration of burst pulse pumping, the peak power that realizes low Repetition Frequency Laser pulse is less, single pulse energy is lower, and the output of the laser pulse sequence that the peak power of high Repetition Frequency Laser pulse is large, single pulse energy is larger.
Fig. 3 is pumping pulse, the Q impulse using in the method according to the embodiment of the present invention and the corresponding Laser output pulse schematic diagram that produces, wherein, by improving the frequency of high frequency Q impulse corresponding to wide pumping pulse, make the single pulse energy of exported high Repetition Frequency Laser pulse less than low repetition.The used time is done in wide pumping pulse, and the single pulse energy of laser pulse of laser transmitting is relevant with the frequency of Q impulse, to Q impulse between the time interval relevant.When the time interval between two Q impulses is enough to make pumping radiation that the inverted population of the upper and lower energy level of laser medium is reached to maximum, laser Output of laser single pulse energy reaches maximum, under the Q impulse effect of same pulsewidth, pulse peak power is also corresponding reaches maximum.On the contrary, when the time interval between two Q impulses reduces, pumping deficiency action time that two adjacent Q impulses limit is so that the upper and lower level inversion population of laser medium reaches maximum, therefore, the single pulse energy of the laser pulse of laser output can reduce, corresponding pulses peak power can decline, in Fig. 3 under the effect of pumping pulse 1, the frequency of the high frequency Q impulse of Q impulse 11 corresponding wide pumping pulses produces the Q pulse frequency the most to a high-profile of maximum single pulse energy higher than laser, so in corresponding Laser output pulse 12, the single pulse energy of high Repetition Frequency Laser pulse is lower, pumping pulse for same widths, the low repetition pulse of peak power ratio corresponding to high Repetition Frequency Laser pulse is low.In addition, the time interval between Q impulse is less, and the repetition rate of Q impulse is higher, and the peak power of the high Repetition Frequency Laser pulse of laser output is just lower, and the single pulse energy of corresponding laser pulse is also just less.Utilize this principle, under wide pumping pulse effect, can be by strengthening the repetition rate of Q impulse, shorten the time interval between adjacent two Q impulses, reduce peak power and the single pulse energy of the high Repetition Frequency Laser pulse of laser output, thereby realize in the same output laser pulse sequence of laser, the laser pulse peaks power of low repetition is large, single pulse energy is higher, and the laser pulse sequence that the peak power of the laser pulse of high repetition is lower, single pulse energy is less output.
Method of the present invention can be applicable to the Q-switched laser of existing any type, and the machinery that comprises laser medium energy storage is adjusted Q, electric-optically Q-switched, acousto-optic Q modulation, saturable absorber is passive Q-adjusted and " cavity dumping " laser of resonant cavity stored energy etc.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (7)
1. the adjustable Q laser pulse production method of a large span repetition transition; it is characterized in that; by control action in pumping pulse sequence and the Q impulse sequence of Q-switched laser; produce the adjustable Q laser pulse sequence of large span repetition transition; wherein; in the adjustable Q laser pulse sequence of described large span repetition transition, comprise the laser pulse with different repetition rates, repetition rate can transition;
Wherein, the pumping pulse width in described pumping pulse sequence is not identical, Q impulse or corresponding a plurality of described Q impulses in a corresponding described Q impulse sequence of pumping pulse.
2. the method for claim 1, it is characterized in that, when by the narrow pumping pulse of a corresponding Q impulse in described pumping pulse sequence, while acting on Q-switched laser with corresponding low frequency Q impulse, after described narrow pumping pulse effect cut-off, postpone a period of time, more described low frequency Q impulse is added to described Q-switched laser.
3. method as claimed in claim 2, is characterized in that, the size of the time postponing is determined by the upper level lifetime of laser medium and the radiated time characteristic of pumping source.
4. the method as described in any one in claim 1～3, it is characterized in that, when by the wide pumping pulse of a plurality of Q impulses of correspondence, while acting on Q-switched laser with corresponding high frequency Q impulse, described wide pumping pulse acts on described Q-switched laser always, when the inverted population of the upper and lower energy of laser inter-stage reaches maximum, a high frequency Q impulse is added to described Q-switched laser at every turn.
5. method as claimed in claim 4, it is characterized in that, the pulse spacing of described high frequency Q impulse, while being more than or equal to the upper level lifetime of laser medium, the single pulse energy of the laser pulse of the high repetition frequency of corresponding described Q-switched laser output did not change with the variation of described high frequency Q impulse frequency.
6. method as claimed in claim 4, it is characterized in that, the time interval that described high frequency Q impulse is added to described Q-switched laser is while being less than the upper level lifetime of laser medium, the single pulse energy of the laser pulse of the high repetition frequency of corresponding described Q-switched laser output changes with the variation of described high frequency Q impulse frequency, and the time interval is less, in described Q-switched laser output laser pulse sequence, single pulse energy is less.
7. method as claimed in claim 2 or claim 3, it is characterized in that, when described narrow pumping pulse and described low frequency Q impulse are acted on to Q-switched laser, by reducing the pulse duration of described narrow pumping pulse, reduce the size of single pulse energy in the laser pulse sequence of described Q-switched laser output when the work of low repetition state.
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| CN105514791B (en) * | 2016-01-19 | 2019-01-22 | 北京镭宝光电技术有限公司 | The multiple laser aid and method for adjusting Q to generate adjustable series impulse of square wave pumping |
| CN106300008B (en) * | 2016-08-30 | 2020-04-28 | 北京卓镭激光技术有限公司 | Method for regulating and controlling output frequency of laser |
| CN110265860B (en) * | 2019-05-29 | 2021-05-25 | 长春新产业光电技术有限公司 | Menu laser with continuously adjustable repetition frequency derived from external trigger signal |
| CN110474227B (en) * | 2019-08-16 | 2021-01-26 | 清华大学 | Burst mode-based short pulse laser system and control method |
| CN110911954B (en) * | 2019-12-09 | 2020-09-22 | 湖北华中光电科技有限公司 | High repetition frequency temperature control-free semiconductor pump 1064nm disk laser |
| CN112234422B (en) * | 2020-10-15 | 2021-07-09 | 黑龙江大学 | Dual-mode intermediate infrared parametric oscillator capable of switching output |
| CN113725715A (en) * | 2021-09-14 | 2021-11-30 | 福建中科光汇激光科技有限公司 | Pump modulation-acousto-optic combined Q-switched oscillation stage and working method thereof |
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