CN102110951A - Method for combining multiple Q-switching pulse lasers - Google Patents
Method for combining multiple Q-switching pulse lasers Download PDFInfo
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- CN102110951A CN102110951A CN 200910254494 CN200910254494A CN102110951A CN 102110951 A CN102110951 A CN 102110951A CN 200910254494 CN200910254494 CN 200910254494 CN 200910254494 A CN200910254494 A CN 200910254494A CN 102110951 A CN102110951 A CN 102110951A
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Abstract
The invention discloses a laser, relating to a diode solid state laser, in particular to a method for combining multiple Q-switching pulse lasers. Multiple groups of diode solid state lasers are distributed around a center axis on a shell bracket with the same radius; laser media are distributed around the center axis of a medium disk with the same radius; a medium disk driving device drives the medium disk to rotate, so that laser media in the medium disk fall into all optical axes of the laser resonant cavity on the shell bracket; laser medium pumping light in each resonant cavity is injected in by a pump laser diode; the laser medium is activated because of realizing population inversion; a Q-switching element is opened, laser is output out of the resonant cavity; and when heat effect generated when the laser medium is irradiated by the pumping light affects laser output quality, the Q-switching element is closed, the medium disk driving device drives the medium disk to rotate, and the next laser medium in the medium disk is on each optical axis of the laser resonant cavity to restart the next operation.
Description
Technical field
The present invention relates to a kind of laser, relate to diode pumping solid laser, particularly a plurality of Q-switched pulse laser synthetic methods.
Background technology
The laser diode solid state laser mainly is made up of pumping source laser diode, coupled system resonant cavity.Resonant cavity is the core of laser, and wherein laser medium is a hinge of realizing pump energy is changed into laser energy.The pumping source laser diode produces in the process of laser output the laser medium effect in the resonant cavity, and laser medium can change into heat energy with portion of energy, produces thermal effect.The thermal effect of laser medium is equal to has increased a uncontrollable imperfect optical element in resonant cavity, often cause the instability of laser output, influences beam quality, reduces the conversion efficiency of pump light and output laser.Particularly under the high power pumping condition, serious thermal effect will cause pump power to increase, and make the power level of laser be difficult to improve.Often to adopt the means of many complexity that thermal effect is controlled in this case, for example adopt complicated water-cooling system to dispel the heat, introduce complicated optical system to offset influence of thermal effect in resonant cavity, these have increased the complexity of laser system greatly.
Transfer the diode pumping solid laser of Q, utilize acoustooptic diffraction usually, the saturable absorption characteristics of electric light diffraction or some medium realize the cyclic variation of resonant cavity cavity loss size.When cavity loss was bigger, oscillation light can not starting of oscillation, and laser does not have laser output, and pump light causes energy level population accumulation on the laser medium, realizes store energy.When cavity loss is smaller, because threshold value reduces, oscillation light starting of oscillation rapidly, concentrated induced transition in the last energy level particle short time in the laser medium, energy stored discharges rapidly, formation laser pulse and exporting.
Owing to increased accent Q unit, the diode pumping solid laser of accent Q structurally is more complex than the same body laser of diode pumping of non-accent Q usually.Thermal effect is more obvious to the influence of laser output performance in this case, and under the same pump power condition, the radiator structure of corresponding Q-switched laser and thermal effect treatment system are more complicated more than non-Q-switched laser.
Summary of the invention
The purpose of this invention is to provide a plurality of Q-switched pulse laser synthetic methods that a kind of architecture is good, power output is high, thermal effect is little.
The object of the present invention is achieved like this, a plurality of Q-switched pulse laser synthetic methods, comprise pump laser diode, coupled system, cavity mirror, laser medium, the diode pumping solid laser that Q switched element and laser output mirror constitute, it is characterized in that: organize diode pumping solid laser more and be distributed on the shell holder with same radius around central shaft, laser medium distributes with same radius around the dielectric disc central shaft, dielectric disc drive unit drive medium dish rotates, making on all the laserresonator optical axises on the shell holder all has the laser medium in the dielectric disc to fall into, by pump laser diode the laser medium pump light in each resonant cavity is injected, make laser medium realize population inversion and activate, Q switched element is opened, the lasing output of resonant cavity; When laser medium is had thermal effect can influence the output quality of laser by light-struck time of pumping, Q switched element is closed, dielectric disc drive unit drive medium dish rotates, and makes that next laser medium is on each laserresonator optical axis work next time again in the dielectric disc.
Described pump laser diode is injected by end face 4 pump lights of the laser medium in each resonant cavity.
Described pump laser diode is injected by the side 4 pump lights of the laser medium in each resonant cavity.
Described pump laser diode is injected by side and end face 4 pump lights of the laser medium in each resonant cavity.
Described laser output mirror can be the optical-fiber laser outgoing mirror.
Described dielectric disc drive unit can be a stepping motor, matching timing action time that is driven Q switched element accent Q in time that dielectric disc rotates and the chamber by the stepping motor output shaft is: the Q switched element work period is that t1 adds t2 in the chamber, to be laser diode inject laser medium in the resonant cavity by coupled system with pump light to t2, the time that makes laser medium realize population inversion and accumulate, at this moment, Q switched element is closed in the chamber, t1 is that Q switched element is opened the time in the chamber, t1=t3+t4, t4＞t3, t3 is that resonant cavity vibrate counter-rotating particle moment to export the effective time of superlaser in the chamber, t4 is in low-yield deferent segment, the positive good utilisation t4 of stepper motor driving circuit time period drive stepping motor is rotated, driving dielectric disc by the stepping motor output shaft rotates, make that next laser medium puts in place in the dielectric disc, the laser medium center is on the resonant cavity optical axis; The t4 time reenters next cycle after finishing.
The time that described stepper motor driving circuit drive stepping motor is rotated once can be identical with the operating frequency of Q switched element in the chamber, also can be the multiple of Q switched element work period in the chamber; The stepper motor driving circuit drive stepping motor is rotated time decision once, depends on that laser medium is still in the situation decision that produces thermal effect on the resonant cavity optical axis.
Described stepper motor driving circuit drive stepping motor is rotated the laser medium that once makes firm work and is entered a cooling buffering area, and the heat that the laser medium of just having worked in the cooling buffering area produces can be cooled to desirable temperature rapidly.
The cooling buffering area can be by the semiconductor cooler that is clamped on the dielectric disc dielectric disc to be under the low temperature, also can be that cold wind acts on it.
Advantage of the present invention is: the method that reduces thermal effect with traditional dual-laser pump laser is different, the present invention proposes one group of N thought that medium takes turns to operate in the laser.Compare with conventional laser, this sharp method makes that each laser medium operating time is very short, makes the hear rate in each medium reduce to limited extent, has realized the control to thermal effect.In this device, comprise in the dielectric disc one group of N medium laser patient hear rate than the big N of limiting value of conventional laser doubly, corresponding increases of the pump power that laser can inject N doubly, the output energy also will increase N times.Therefore, the present invention is effective ways of realizing the output of laser high energy.
Description of drawings
Below in conjunction with drawings and Examples the present invention is advanced step explanation one by one.
Fig. 1 is an embodiment of the invention structural representation;
Fig. 2 is diode pumping solid laser work schematic diagram among Fig. 1;
Fig. 3 is the another embodiment of the present invention structural representation;
Fig. 4 and Fig. 5 have provided the drive circuit drive stepping motor, are driven matching timing explanation action time of Q switched element 7 accent Q in time that dielectric disc 5 rotate and the chamber by stepping motor output shaft 4;
Fig. 6 is the structural map of dielectric disc embodiment.
Among the figure, 1, laser diode; 2, coupled system; 3, cavity mirror; 4, laser medium; 5, dielectric disc; 6, dielectric disc drive unit; 7, Q switched element; 8, laser output mirror; 9, optical fiber; 10, axle sleeve; 11, diode pumping solid laser; 12, central shaft; 13, resonant cavity optical axis; 14, stepping motor output shaft; 15, shell holder.
Embodiment
As depicted in figs. 1 and 2, comprise the diode pumping solid laser 11 that pump laser diode 1, coupled system 2, cavity mirror 3, laser medium 4 and laser output mirror 8 constitute, as shown in Figure 2, many group diode pumping solid lasers 11 are distributed on the shell holder 15 around central shaft 12 with same radius, laser medium 4 distributes with same radius around dielectric disc 5 central shafts (coaxial with central shaft 12), dielectric disc drive unit 6 drive medium dishes 5 rotate, and making all has the laser medium 4 in the dielectric disc 5 to fall on all laserresonator optical axises 13 on the shell holder 15.As shown in Figure 1, Fig. 1 provides diode pumping solid laser schematic diagram in 2, by can understand the course of work of many group diode pumping solid lasers 11 to the explanation of Fig. 1.In Fig. 1, by end face and profile pump laser diode 1 laser medium in each resonant cavity 4 is injected pump light, make the laser medium 4 in the resonant cavity realize population inversion and activate the lasing output of resonant cavity; When laser medium 4 can be influenced the output quality of laser by the light-struck time generation of pumping thermal effect, dielectric disc drive unit 6 drive medium dish 5 again rotates, make that next laser medium 4 is on each laserresonator optical axis 13 in the dielectric disc 5, laser produces new laser output, organizes the output of diode pumping solid laser laser by optical fiber 9 synthetic last outputs more.
There is not Q switched element 7 between laser medium 4 and the laser output mirror 8, constitute a kind of quasi continuous diode light-pumped solid state laser, between laser medium 4 and laser output mirror 8, increase Q switched element 7, constitute and transfer the Q diode pumping solid laser, shown in Figure 3, it has provided the structure that increases Q switched element 7 between laser medium 4 and laser output mirror 8, when Q switched element 7 is closed, dielectric disc drive unit 6 drive medium dishes 5 rotate, all laserresonators are exported on the axis of light all has the laser medium 4 in the dielectric disc 5 to fall into, by end face and profile pump laser diode 1 laser medium in each resonant cavity 4 is injected pump light, make laser medium 4 realize population inversion and activate, after this, Q switched element 7 is opened, the lasing output of resonant cavity; When laser medium 4 is had thermal effect to produce by light-struck time of pumping, in the time of can influencing the output quality of laser or reduce power output, Q switched element 7 is closed, dielectric disc drive unit 6 drive medium dishes 5 rotate, next laser medium 4 in the dielectric disc 5 is on the axis of each laserresonator output light, again work next time, the output of as much group diode pumping solid laser 11 laser is exported on an optical axis by optical fiber 9 synthetic last outputs or by optical system reflection back.Certainly also can be by each each diode pumping solid laser optical axis output.
Dielectric disc drive unit 6 can be made up of stepping motor and stepper motor driving circuit, dielectric disc 5 is fixed on the stepping motor output shaft 14, stepping motor output shaft 14 and laserresonator parallel axes, stepping motor is under drive circuit drives, the stepping motor output shaft drives dielectric disc 5 and rotates, laser medium 4 centers in the dielectric disc 5 are entered on each laser resonance cavity axis, if 4 cover diode pumping solid lasers are installed on shell holder 15 simultaneously, then need once to have 4 laser mediums 4 to enter the center of laserresonator simultaneously, if 10 cover diode pumping solid lasers are installed on shell holder simultaneously, then need once to have 10 laser mediums 4 to enter the center of laserresonator simultaneously, when the center of laser medium 4 enters on the laserresonator central axis, dielectric disc drive unit 6 stops (if inertia is arranged, need examine the influence of filter inertia), at this moment, pump laser diode 1 is injected laser medium 4 (requiring laser medium 4 to be cylindrical structure) by end face coupled system 2 and side mode with pump light and is achieved population inversion and activate, laser resonant cavity generation laser output under Q switched element 7 effects in the chamber simultaneously, when laser medium 4 generation thermal effects influence laser resonant cavity output laser power, drive circuit drive stepping motor rotating band moving medium dish 5 is on the axis of laserresonator output light next laser medium 4 adjacent in the dielectric disc 5, again work next time repeats in proper order.
Dielectric disc drive unit 6 can be a stepping motor, Fig. 4 and Fig. 5 have provided the drive circuit drive stepping motor, drive by stepping motor output shaft 14 under the situation of time Q switched element 7 in the chamber is arranged that dielectric disc 5 rotate with the chamber in Q switched element 7 matching timing explanation action time of transferring Q.Q switched element 7 is operated between 1KHz or the 10KHz in the chamber, with 10KHz is example, and among Fig. 4, it is one-period that t1 adds t2, be 100us cycle time, and t2 to be laser diode 1 inject laser medium 4 in the resonant cavity by coupled system 2 with pump light, make laser medium 4 realize population inversion and time of accumulating, at this moment, Q switched element 7 is closed in the chamber, shut-in time is 90us, and t1 is that Q switched element 7 is opened the time in the chamber, and t1 is 10us.As shown in Figure 5, Q switched element 7 was opened in the time in the chamber of the 10us of t1, wherein resonant cavity makes counter-rotating particle moment t3 effective time that exports superlaser that vibrate in the chamber be about 10ns, all the other a large amount of time t4 are in low-yield deferent segment, the positive good utilisation t4 of stepper motor driving circuit time period drive stepping motor is rotated, drive dielectric disc 5 by stepping motor output shaft 4 and rotate, make that next laser medium 4 puts in place in the dielectric disc 5, laser medium 4 centers are on resonant cavity optical axis 13.The t4 time reenters next cycle after finishing.The time that the stepper motor driving circuit drive stepping motor is rotated once can be identical with the operating frequency of Q switched element in the chamber 7, also can be the multiple of 7 work periods of Q switched element in the chamber.When the cycle of Q switched element in the chamber 7 is 100us, the time that the stepper motor driving circuit drive stepping motor is rotated once can be selected between 100us to 200ms, and the condition of select time is: as long as selected laser medium 4 is still in the thermal effect that does not form influence output superlaser energy on the resonant cavity optical axis 13.After the laser medium 4 of last time work shifts out, enter the natural cooling state, laser medium 4 numbers of placing on the time of reworking on the resonant cavity optical axis 13 and the dielectric disc 5 are relevant to enter next time, as 10 laser mediums 4 are arranged on dielectric disc 5, and the time that the stepper motor driving circuit drive stepping motor is rotated once is 200ms, and the time interval of then reworking is 2S.The time that the time interval of reworking rotates once according to the number and the stepper motor driving circuit drive stepping motor of laser medium 4 determines, depends on that finally laser medium 4 is still in the situation decision that produces thermal effect on the resonant cavity optical axis 13.
Existing stepping motor rotating speed can design 1000 rev/mins of kinds, it is more stable to be applied in 600 rev/mins of kinds, as be used in 600 rev/mins of uses, be distributed with 100 laser mediums 4 on the dielectric disc 5 and just can reach the frequency of 1K, therefore will reach higher one is that to improve frequency one be to improve the stepping motor rotating speed, the 2nd, increase the quantity of laser medium 4.
Because laser medium 4 is taken turns and is changed jobs, each is in, and laser medium 4 can not change owing to influence of thermal effect makes the condition of resonance of resonant cavity on the resonant cavity optical axis 13, therefore by increasing the diode pumping solid laser tricks on the shell holder, to improve whole laser output energy greatly, watt level is directly proportional with the diode pumping solid laser tricks in theory.
Pumping source has adopted optical fiber Coupling LD (laser diode 1), can dispense coupled system 2 (also can not omitting according to actual conditions), and the optical fiber Coupling LD has reasonable beam quality usually, helps improving the output performance of laser.
As shown in Figure 6, referring to Fig. 1 and Fig. 3, the dielectric disc 5 coaxial all equally spaced laser mediums 4 that are distributed with, laser medium 4 diameters can be at ￠ 1.5-￠ 3, and the quantity of laser medium 4 determines that as required quantity is indefinite at tens to hundreds of.Be distributed with 400 laser mediums 4 as dielectric disc 5,10 cover diode pumping solid lasers are installed on the shell holder simultaneously, then the operating time of each laser medium 4 is 1/40, and this is very effective for the thermal effect influence of getting rid of medium.Because in this design, if in the dielectric disc N medium arranged, M cover diode pumping solid laser is arranged, the M/N the when hear rate of medium has only a medium to work independently in theory, by increasing N, the thermal effect of medium will reduce greatly.By add Q switched element 7 in resonant cavity, this laser will be realized Q impulse output.Under the situation that does not add Q switched element, this laser can be realized quasi-continuous operation or pulsed operation under the control of pump light.Laser medium between the adjacent laser medium 4 is heat isolation mutually at interval.Dielectric disc 5 centers are axle sleeve 10 structures, and axle sleeve 10 is fixing by fastening disk and stepping motor output shaft 14, can not produce vibration and skew when dielectric disc 5 is rotated.
Claims (8)
1. many Q-switched pulse laser synthetic methods, comprise pump laser diode, coupled system, cavity mirror, laser medium, the diode pumping solid laser that Q switched element and laser output mirror constitute, it is characterized in that: organize diode pumping solid laser more and be distributed on the shell holder with same radius around central shaft, laser medium distributes with same radius around the dielectric disc central shaft, dielectric disc drive unit drive medium dish rotates, making on all the laserresonator optical axises on the shell holder all has the laser medium in the dielectric disc to fall into, by pump laser diode the laser medium pump light in each resonant cavity is injected, make laser medium realize population inversion and activate, Q switched element is opened, the lasing output of resonant cavity; When laser medium is had thermal effect can influence the output quality of laser by light-struck time of pumping, Q switched element is closed, dielectric disc drive unit drive medium dish rotates, and makes that next laser medium is on each laserresonator optical axis work next time again in the dielectric disc.
2. according to many Q-switched pulse laser synthetic methods of claim 1, described pump laser diode 1 is injected by end face the laser medium pump light in each resonant cavity.
3. according to many Q-switched pulse laser synthetic methods of claim 1, described pump laser diode 1 is injected by the side the laser medium pump light in each resonant cavity.
4. according to many Q-switched pulse laser synthetic methods of claim 1, described pump laser diode 1 is injected by side and end face the laser medium pump light in each resonant cavity.
5. a plurality of Q-switched pulse laser synthetic method according to claim 1 is characterized in that: described laser output mirror can be the optical-fiber laser outgoing mirror.
6. a plurality of Q-switched pulse laser synthetic method according to claim 1, it is characterized in that: described dielectric disc drive unit can be a stepping motor, matching timing action time that is driven Q switched element accent Q in time that dielectric disc rotates and the chamber by the stepping motor output shaft is: the Q switched element work period is that t1 adds t2 in the chamber, to be laser diode inject laser medium in the resonant cavity by coupled system with pump light to t2, the time that makes laser medium realize population inversion and accumulate, at this moment, Q switched element is closed in the chamber, t1 is that Q switched element is opened the time in the chamber, t1=t3+t4, t4＞t3, t3 is that resonant cavity vibrate counter-rotating particle moment to export the effective time of superlaser in the chamber, t4 is in low-yield deferent segment, the positive good utilisation t4 of stepper motor driving circuit time period drive stepping motor is rotated, drive dielectric disc by the stepping motor output shaft and rotate, make that next laser medium puts in place in the dielectric disc, the laser medium center is on the resonant cavity optical axis; The t4 time reenters next cycle after finishing.
7. a plurality of Q-switched pulse laser synthetic method according to claim 6, it is characterized in that: the time that described stepper motor driving circuit drive stepping motor is rotated once can be identical with the operating frequency of Q switched element in the chamber, also can be the multiple of Q switched element work period in the chamber; The stepper motor driving circuit drive stepping motor is rotated time decision once, depends on that laser medium is still in the situation decision that produces thermal effect on the resonant cavity optical axis.
8. a plurality of Q-switched pulse laser synthetic method according to claim 7, it is characterized in that: the stepper motor driving circuit drive stepping motor is rotated the laser medium that once makes firm work and is entered a cooling buffering area, and the heat that the laser medium of just having worked in the cooling buffering area produces can be cooled to desirable temperature rapidly; The cooling buffering area can be by the semiconductor cooler that is clamped on the dielectric disc dielectric disc to be under the low temperature, also can be that cold wind acts on it.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810812A (en) * | 2012-07-25 | 2012-12-05 | 西安电子科技大学 | Fiber-coupled output Q-switched solid-state laser and manufacturing process |
| KR101596478B1 (en) * | 2015-06-23 | 2016-03-07 | 엘브이아이테크놀러지(주) | Multi-pulse width as the laser output of laser equipment |
| CN107026386A (en) * | 2017-04-24 | 2017-08-08 | 中国科学院光电技术研究所 | Automatic pointing control device for multi-path pulse light beam time sequence synthesis |
| CN109149327A (en) * | 2018-10-30 | 2019-01-04 | 中国工程物理研究院激光聚变研究中心 | A kind of multiple-beam synthesis rotation laser and laser equipment |
| CN115149381A (en) * | 2022-09-02 | 2022-10-04 | 北京世纪飞讯科技有限公司 | Solid laser with multiple working media |
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2009
- 2009-12-24 CN CN 200910254494 patent/CN102110951A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810812A (en) * | 2012-07-25 | 2012-12-05 | 西安电子科技大学 | Fiber-coupled output Q-switched solid-state laser and manufacturing process |
| KR101596478B1 (en) * | 2015-06-23 | 2016-03-07 | 엘브이아이테크놀러지(주) | Multi-pulse width as the laser output of laser equipment |
| CN107026386A (en) * | 2017-04-24 | 2017-08-08 | 中国科学院光电技术研究所 | Automatic pointing control device for multi-path pulse light beam time sequence synthesis |
| CN107026386B (en) * | 2017-04-24 | 2019-07-12 | 中国科学院光电技术研究所 | Automatic pointing control device for multi-path pulse light beam time sequence synthesis |
| CN109149327A (en) * | 2018-10-30 | 2019-01-04 | 中国工程物理研究院激光聚变研究中心 | A kind of multiple-beam synthesis rotation laser and laser equipment |
| CN115149381A (en) * | 2022-09-02 | 2022-10-04 | 北京世纪飞讯科技有限公司 | Solid laser with multiple working media |
| CN115149381B (en) * | 2022-09-02 | 2022-11-15 | 北京世纪飞讯科技有限公司 | Solid laser with multiple working media |
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Application publication date: 20110629 |