CN105186281A - Control method for laser device output, and laser device - Google Patents
Control method for laser device output, and laser device Download PDFInfo
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- CN105186281A CN105186281A CN201510725154.1A CN201510725154A CN105186281A CN 105186281 A CN105186281 A CN 105186281A CN 201510725154 A CN201510725154 A CN 201510725154A CN 105186281 A CN105186281 A CN 105186281A
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Abstract
The invention discloses a control method for laser device output, and a laser device. The method comprises the steps: inputting pumping light into a resonant cavity of the laser device; increasing driving voltage of an acousto-optic Q switch of the laser device and/or driving current of a pumping source of the laser device in a process that a gain medium of the laser device absorbs and stores energy-level inversion population on pumping light accumulation laser to enable the laser device to meet oscillation starting conditions before the driving voltage of the acousto-optic Q switch reaches the maximum bearing voltage of the acousto-optic Q switch to output a first light pulse; and further increasing the driving voltage of the acousto-optic Q switch and/or the driving current of the pumping source in the work period of the acousto-optic Q switch to enable the laser device to meet the oscillation starting conditions again before the driving voltage of the acousto-optic Q switch reaches the maximum bearing voltage of the acousto-optic Q switch to output a second light pulse. By using the manner, at least two light pulses are output within a same work period of the acousto-optic Q switch.
Description
Technical field
The present invention relates to laser treatment technique field, particularly relate to control method and the laser of the output of a kind of laser.
Background technology
At present, laser refers to the laser being controlled output optical pulse by its built-in acoustooptic Q-switching, concrete, laser makes its resonant cavity be in low reactance-resistance ratio state when pumping starts, vibration in resonant cavity can not be generated, when upper laser level inverted population is just to when running up to maximum, suddenly the driving voltage of acoustooptic Q-switching is made to rise to maximum, in resonant cavity, vibration is set up rapidly, on extremely short time inner laser, level inversion population is consumed, change the light energy in resonant cavity into, resonant cavity output with Sing plus form by fault offset out, and the peak value of Sing plus and power are all very high.
After Sing plus has discharged, the driving voltage of acoustooptic Q-switching has pulled back to low value, again accumulation upper laser level inverted population, generates next Sing plus.Due within a work period of acoustooptic Q-switching, its Sing plus exported, Sing plus not merely peak value and power high, the time exported is also long, when single light pulse is directly beaten on object to be processed, the heat build-up made near machined object dignity is easily become to cause object to be processed deformation.
Summary of the invention
The technical problem that the present invention mainly solves is to provide the control method that a kind of laser exports, and can realize exporting at least two light pulses within the same work period of acoustooptic Q-switching, and the energy of single light pulse is low, output time is short.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: the control method providing a kind of laser to export, comprises the pumping source making described laser, input pumping light in the resonant cavity of described laser; Absorb in the process storing described pump light accumulation upper laser level inverted population at the gain media of described laser, and within the work period of acoustooptic Q-switching, improve the driving voltage of the acoustooptic Q-switching of described laser and/or improve the drive current of described pumping source, and with reach at the driving voltage of described acoustooptic Q-switching its maximum bear voltage before, described laser meets resonant cavity starting condition for oscillation, and described laser exports the first light pulse; After described laser exports the first light pulse, continue within the work period of described acoustooptic Q-switching, improve the driving voltage of described acoustooptic Q-switching and/or improve the drive current of described pumping source, with reach at the driving voltage of described acoustooptic Q-switching its maximum bear voltage before described laser again meet resonant cavity starting condition for oscillation, described laser exports the second light pulse.
Wherein, described resonant cavity starting condition for oscillation be described laser resonant cavity in gain coefficient be greater than the intra resonant cavity loss factor of described laser.
Wherein, after described laser exports the first light pulse or described laser exports the second light pulse, in the resonant cavity of described laser, gain coefficient all declines; In described resonant cavity, gain coefficient gathers way along with the drive current increase of described pumping source and increases, the Q value of described acoustooptic Q-switching increases along with the increase of the driving voltage of described acoustooptic Q-switching, and the intra resonant cavity loss factor of described laser reduces along with the increase of the Q value of acoustooptic Q-switching.
Wherein, described method also comprises: arrive it at the driving voltage of described acoustooptic Q-switching and maximumly bear voltage, and after the upper laser level of described gain media reversion particle is eliminated, the driving voltage of described acoustooptic Q-switching is adjusted downward to the first predetermined value, the drive current of described pumping source is adjusted downward to the second predetermined value, and return described absorption at described gain media and store described pump light with in the process making the upper laser level inverted population of described gain media and accumulate, the driving voltage improving described acoustooptic Q-switching is to improve the Q value of described acoustooptic Q-switching and/or to improve the step of drive current of described pumping source.
Wherein, when described laser exports the first light pulse, described method also comprises: make described first light pulse get on object to be processed; When described laser exports the second light pulse, described method also comprises: described second light pulse is got on object to be processed.
For solving the problems of the technologies described above, another technical solution used in the present invention is: provide a kind of laser, comprise: high reflectance reflection fiber grating, antiradar reflectivity reflection fiber grating, acoustooptic Q-switching, pumping source, controller and gain media, described high reflectance reflection fiber grating, gain media form resonant cavity mutually with antiradar reflectivity reflection fiber grating, described acoustooptic Q-switching and pumping source are all arranged in described resonant cavity, and described controller is connected with described acoustooptic Q-switching, pumping source and gain media respectively; Described pumping source, for described resonant cavity input pumping light; Described gain media, for storing described pump light, accumulation upper laser level inverted population; Described controller, for in the process of described gain media accumulation upper laser level inverted population, and within the work period of described acoustooptic Q-switching, improve the driving voltage of described acoustooptic Q-switching and/or improve the drive current of described pumping source, with reach at the driving voltage of described acoustooptic Q-switching its maximum bear voltage before, described laser meets resonant cavity starting condition for oscillation, and described laser exports the first light pulse; After described laser exports the first light pulse, continue within the work period of described acoustooptic Q-switching, improve the driving voltage of described acoustooptic Q-switching and/or improve the drive current of described pumping source, with reach at the driving voltage of described acoustooptic Q-switching maximum bear voltage before described laser again meet resonant cavity starting condition for oscillation, described laser exports the second light pulse;
Wherein, described resonant cavity starting condition for oscillation be described laser resonant cavity in gain coefficient be greater than the intra resonant cavity loss factor of described laser.
Wherein, export after described laser that the first light pulse or described laser export the second light pulse exports each light pulse at described laser, in the resonant cavity of described laser, gain coefficient all declines; In described resonant cavity, gain coefficient gathers way along with the drive current increase of described pumping source and increases, the Q value of described acoustooptic Q-switching increases along with the increase of the driving voltage of described acoustooptic Q-switching, and the intra resonant cavity loss factor of described laser reduces along with the increase of the Q value of acoustooptic Q-switching.
Wherein, described controller also for: arrive it at the driving voltage of described acoustooptic Q-switching and maximumly bear voltage, and after the upper laser level of described gain media reversion particle is eliminated, the driving voltage of described acoustooptic Q-switching is adjusted downward to the first predetermined value, and the drive current of described pumping source is adjusted downward to the second predetermined value.
Wherein, described gain media comprises helium, neon, ruby, GaAs, chromic sulfide zinc sulphide, rare earth ion and argon ion.
The invention has the beneficial effects as follows: the situation being different from prior art, the present invention absorbs at the gain media of laser and stores pump light, in the process of accumulation upper laser level inverted population, improve the driving voltage of the acoustooptic Q-switching of laser and/or improve the drive current of pumping source, with reach at the driving voltage of acoustooptic Q-switching its maximum bear voltage before laser meet resonant cavity starting condition for oscillation, laser exports the first light pulse, after output first light pulse, within the same work period of acoustooptic Q-switching, continue improve the driving voltage of acoustooptic Q-switching and/or improve the drive current of pumping source, with reach at the driving voltage of acoustooptic Q-switching its maximum bear voltage before laser again meet resonant cavity starting condition for oscillation, laser exports the second light pulse, wherein, due to the first light pulse and the second light pulse be all acoustooptic Q-switching the same work period in export, realize exporting at least two light pulses within the same work period of acoustooptic Q-switching, and the energy of single light pulse is low, output time is short.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of laser embodiments of the present invention;
Fig. 2 is the schematic diagram exporting a light pulse, two light pulses and three light pulses in laser embodiments of the present invention within a work period of acoustooptic Q-switching;
Fig. 3 is the schematic diagram regulating the drive current of the driving voltage of the acoustooptic Q-switching of laser and/or raising pumping source to produce multiple light pulse in laser embodiments of the present invention;
Fig. 4 is the flow chart of the control method execution mode that laser of the present invention exports.
Embodiment
Below in conjunction with drawings and embodiments, the present invention is described in detail.
Refer to Fig. 1, laser 20 comprises high reflectance reflection fiber grating 21, antiradar reflectivity reflection fiber grating 22, acoustooptic Q-switching 23, pumping source 24, controller 25 and gain media 26, high reflectance reflection fiber grating 21, antiradar reflectivity reflection fiber grating 22 and gain media 26 form resonant cavity 221, acoustooptic Q-switching 23 and pumping source 24 are all arranged in resonant cavity 221, and controller 25 is connected with acoustooptic Q-switching 23, pumping source 24 and gain media 26 respectively.
Pumping source 24, for resonant cavity 221 input pumping light.Gain media 26, for storing pump light, accumulation upper laser level inverted population.Controller 25, for in the process of gain media 26 accumulation upper laser level inverted population and within the work period of acoustooptic Q-switching 23, improve the driving voltage of acoustooptic Q-switching 23 and/or improve the drive current of pumping source 24, with reach at the driving voltage of acoustooptic Q-switching 23 its maximum bear voltage before laser meet resonant cavity 221 starting condition for oscillation, laser exports the first light pulse, after laser exports the first light pulse, continue within the work period of acoustooptic Q-switching 23, improve the driving voltage of acoustooptic Q-switching 23 and/or improve the drive current of pumping source 24, with reach at the driving voltage of acoustooptic Q-switching 23 maximum bear voltage before laser again meet resonant cavity 221 starting condition for oscillation, laser exports the second light pulse.
First light pulse and the second light pulse be all within the work period of same acoustooptic Q-switching and acoustooptic Q-switching 23 driving voltage arrive maximum bear voltage before export, therefore, the energy of the first light pulse and the second light pulse is not maximum, and also shorten the action time of individual pulse, when the first light pulse and the second light pulse are got on object to be processed, effectively can avoid accumulating heat near machined object dignity and cause object to be processed to become.
It should be noted that: after laser exports the second light pulse, controller 25 can also continue improve the driving voltage of acoustooptic Q-switching 23 and/or improve the drive current of pumping source 24, and the driving voltage of acoustooptic Q-switching 23 reach its maximum bear voltage before, resonant cavity 221 starting condition for oscillation is met again to make laser, laser exports the 3rd light pulse, as shown in Figure 2, Fig. 2 represents the schematic diagram exporting single light pulse, two light pulses and three light pulses within a work period of acoustooptic Q-switching; Certainly, individual pulse, two light pulses and three light pulses not only can be exported within a work period of acoustooptic Q-switching, also the light pulse that four light pulses, five light pulses, six light pulses etc. are more can be exported, those skilled in the art can pass through the amplification controlling the driving voltage of acoustooptic Q-switching 23 and the drive current of pumping source 24, to meet the light pulse of closing the required quantity of duty cycle lasers device output of Q switching at sound.
Because laser is when output first light pulse and the second light pulse, acoustooptic Q-switching 23 does not all reach it and maximumly bears voltage, therefore, accumulation upper laser level inverted population just part release in gain media 26, all do not discharge, be conducive to for the upper laser level of light pulse accumulation once inverted population, as shown in Figure 3.In the present embodiment, resonant cavity 221 starting condition for oscillation be laser resonant cavity 221 in gain coefficient be greater than the resonant cavity 221 internal loss coefficient of laser.The maximum voltage that bears of acoustooptic Q-switching refers to the maximum voltage that acoustooptic Q-switching can bear, and maximumly bear voltage when voltage exceedes, acoustooptic Q-switching will damage.In addition, after laser exports the first light pulse or laser exports the second light pulse, in the resonant cavity 221 of laser, gain coefficient all declines.In resonant cavity 221, gain coefficient gathers way along with the drive current increase of pumping source 24 and increases, the Q value of acoustooptic Q-switching 23 increases along with the increase of the driving voltage of acoustooptic Q-switching 23, and the resonant cavity 221 internal loss coefficient of laser reduces along with the increase of the Q value of acoustooptic Q-switching 23.
Further, arrive it at the driving voltage of acoustooptic Q-switching 23 and maximumly bear voltage, and after the upper laser level of gain media 26 reversion particle is eliminated, after work period of acoustooptic Q-switching 23 completes, the driving voltage of acoustooptic Q-switching 23 is adjusted downward to the first predetermined value by controller 25, the drive current of pumping source 24 is adjusted downward to the second predetermined value, and gain media 26 is accumulation upper laser level reversion particle again.Wherein, the first predetermined value is lower numerical value, in other words, when just starting accumulation upper laser level inverted population, reduce the driving voltage of acoustooptic Q-switching 23, to reduce the Q value of acoustooptic Q-switching 23, thus increase the resonant cavity 221 internal loss coefficient of laser, stop resonant cavity 221 starting of oscillation.In the present embodiment, gain media 26 comprises helium, neon, ruby, GaAs, chromic sulfide zinc sulphide, rare earth ion and argon ion.Wherein, rare earth ion can be the object that the elements such as Er, Nd and Yb are made as alloy.
In embodiments of the present invention, absorb at the gain media of laser and store pump light, in the process of accumulation upper laser level inverted population, improve the driving voltage of the acoustooptic Q-switching of laser and/or improve the drive current of pumping source, and the driving voltage of acoustooptic Q-switching reach its maximum bear voltage before, to make laser meet resonant cavity starting condition for oscillation, laser exports the first light pulse, after output first light pulse, within the same work period of acoustooptic Q-switching, continue improve the driving voltage of acoustooptic Q-switching and/or improve the drive current of pumping source, with reach at the driving voltage of acoustooptic Q-switching its maximum bear voltage before laser again meet resonant cavity starting condition for oscillation, laser exports the second light pulse, wherein, because the first light pulse and the second light pulse are all export within the same cycle of acoustooptic Q-switching, realize exporting at least two light pulses in the same period of acoustooptic Q-switching, and the energy of single light pulse is low, output time is short.
Invention further provides the control method execution mode that a kind of laser exports.Refer to Fig. 2, method comprises:
Step S301: make the pumping source of laser to input pumping light in the resonant cavity of laser;
After pumping source exports pump light, the gain media meeting absorptive pumping light in resonant cavity, and level inversion population on excitation laser.
Step S302: absorb at the gain media of laser in the process storing pump light accumulation upper laser level inverted population, and within the work period of acoustooptic Q-switching, improve the driving voltage of the acoustooptic Q-switching of laser and/or improve the drive current of pumping source, and with reach at the driving voltage of acoustooptic Q-switching its maximum bear voltage before laser meet resonant cavity starting condition for oscillation, laser exports the first light pulse;
Certainly, when just starting accumulation upper laser level inverted population, the driving voltage of acoustooptic Q-switching can be reduced, to reduce the Q value of acoustooptic Q-switching, thus increasing the intra resonant cavity loss factor of laser, stoping resonant cavity starting of oscillation.After upper laser level inverted population is accumulated to certain phase, such as: upper laser level inverted population is accumulate to maximum, just improve the driving voltage of the acoustooptic Q-switching of laser and/or improve the drive current of pumping source.
Step S303: after laser exports the first light pulse, continue within the work period of acoustooptic Q-switching, improve the driving voltage of acoustooptic Q-switching and/or improve the drive current of pumping source, with reach at the driving voltage of acoustooptic Q-switching its maximum bear voltage before laser again meet resonant cavity starting condition for oscillation, laser exports the second light pulse;
The maximum voltage that bears of acoustooptic Q-switching refers to the maximum voltage that acoustooptic Q-switching can bear, and maximumly bear voltage when voltage exceedes, acoustooptic Q-switching will damage.And the amplification of the drive current of the driving voltage of acoustooptic Q-switching and raising pumping source can set according to actual conditions.
Due to laser in output first light pulse and the second light pulse time, acoustooptic Q-switching does not all reach it and maximumly bears voltage, therefore, accumulation upper laser level inverted population just part release in gain media, all do not discharge, be conducive to for the upper laser level of light pulse accumulation once inverted population.In the present embodiment, resonant cavity starting condition for oscillation be laser resonant cavity in gain coefficient be greater than the intra resonant cavity loss factor of laser.After laser exports the first light pulse or laser exports the second light pulse, in the resonant cavity of laser, gain coefficient all declines.In resonant cavity, gain coefficient gathers way along with the drive current increase of pumping source and increases, the Q value of acoustooptic Q-switching increases along with the increase of the driving voltage of acoustooptic Q-switching, and the intra resonant cavity loss factor of laser reduces along with the increase of the Q value of acoustooptic Q-switching.
Further, arrive it at the driving voltage of acoustooptic Q-switching and maximumly bear voltage, after the upper laser level reversion particle of gain media is eliminated, the driving voltage of acoustooptic Q-switching and the drive current of pumping source are turned down by reclosing, enter next circulation, then method also comprises:
Step S304: arrive it at the driving voltage of acoustooptic Q-switching and maximumly bear voltage, and after the upper laser level of gain media reversion particle is eliminated, the driving voltage of acoustooptic Q-switching is adjusted downward to the first predetermined value, and the drive current of pumping source is adjusted downward to the second predetermined value, and returns step S302.
First predetermined value and the second predetermined value are the numerical value that numerical value is lower, and in order to avoid the upper laser level reversion particle accumulated at gain media is less, vibration appears in resonance control.
Certainly, after laser exports the first light pulse and the second light pulse, the first light pulse can also be made to get on object to be processed, and make the second light pulse get on object to be processed, realize carrying out laser processing process to object to be processed.
In embodiments of the present invention, absorb at the gain media of laser and store pump light, in the process of accumulation upper laser level inverted population, improve the driving voltage of the acoustooptic Q-switching of laser and/or improve the drive current of pumping source, and the driving voltage of acoustooptic Q-switching reach its maximum bear voltage before, to make laser meet resonant cavity starting condition for oscillation, laser exports the first light pulse, after output first light pulse, within the same work period of acoustooptic Q-switching, continue improve the driving voltage of acoustooptic Q-switching and/or improve the drive current of pumping source, with reach at the driving voltage of acoustooptic Q-switching its maximum bear voltage before laser again meet resonant cavity starting condition for oscillation, laser exports the second light pulse, wherein, due to the first light pulse and the second light pulse be all acoustooptic Q-switching the same cycle in export, realize exporting at least two light pulses in the same period of acoustooptic Q-switching, and the energy of single light pulse is low, output time is short.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a control method for laser output, is characterized in that, comprising:
Make the pumping source of described laser to input pumping light in the resonant cavity of described laser;
Absorb in the process storing described pump light accumulation upper laser level inverted population at the gain media of described laser, and within the work period of acoustooptic Q-switching, improve the driving voltage of described acoustooptic Q-switching and/or improve the drive current of described pumping source, and with reach at the driving voltage of described acoustooptic Q-switching its maximum bear voltage before, described laser meets resonant cavity starting condition for oscillation, and described laser exports the first light pulse;
After described laser exports the first light pulse, continue within the work period of described acoustooptic Q-switching, improve the driving voltage of described acoustooptic Q-switching and/or improve the drive current of described pumping source, with reach at the driving voltage of described acoustooptic Q-switching its maximum bear voltage before, described laser meets described resonant cavity starting condition for oscillation again, and described laser exports the second light pulse.
2. method according to claim 1, is characterized in that,
Described resonant cavity starting condition for oscillation be described laser resonant cavity in gain coefficient be greater than the intra resonant cavity loss factor of described laser.
3. method according to claim 2, is characterized in that,
After described laser exports the first light pulse or described laser exports the second light pulse, in the resonant cavity of described laser, gain coefficient all declines;
In described resonant cavity, gain coefficient gathers way along with the drive current increase of described pumping source and increases, the Q value of described acoustooptic Q-switching increases along with the increase of the driving voltage of described acoustooptic Q-switching, and the intra resonant cavity loss factor of described laser reduces along with the increase of the Q value of acoustooptic Q-switching.
4. method according to claim 1, is characterized in that, described method also comprises:
Arrive it at the driving voltage of described acoustooptic Q-switching and maximumly bear voltage, and after the upper laser level of described gain media reversion particle is eliminated, the driving voltage of described acoustooptic Q-switching is adjusted downward to the first predetermined value, the drive current of described pumping source is adjusted downward to the second predetermined value, and return described absorption at described gain media and store described pump light with in the process making the upper laser level inverted population of described gain media and accumulate, the driving voltage improving described acoustooptic Q-switching is to improve the Q value of described acoustooptic Q-switching and/or to improve the step of drive current of described pumping source.
5. method according to claim 1, is characterized in that,
When described laser exports the first light pulse, described method also comprises: make described first light pulse get on object to be processed;
When described laser exports the second light pulse, described method also comprises: described second light pulse is got on object to be processed.
6. a laser, it is characterized in that, comprise: high reflectance reflection fiber grating, antiradar reflectivity reflection fiber grating, acoustooptic Q-switching, pumping source, controller and gain media, described high reflectance reflection fiber grating, antiradar reflectivity reflection fiber grating and gain media form resonant cavity, described acoustooptic Q-switching and pumping source are arranged in described resonant cavity, and described controller is connected with described acoustooptic Q-switching, pumping source and gain media respectively;
Described pumping source, for described resonant cavity input pumping light;
Described gain media, for storing described pump light, accumulation upper laser level inverted population;
Described controller, for in the process of described gain media accumulation upper laser level inverted population, and within the work period of described acoustooptic Q-switching, improve the driving voltage of described acoustooptic Q-switching and/or improve the drive current of described pumping source, with reach at the driving voltage of described acoustooptic Q-switching its maximum bear voltage before described laser meet resonant cavity starting condition for oscillation, described laser exports the first light pulse; After described laser exports the first light pulse, continue within the work period of described acoustooptic Q-switching, improve the driving voltage of described acoustooptic Q-switching and/or improve the drive current of described pumping source, with reach at the driving voltage of described acoustooptic Q-switching its maximum bear voltage before described laser again meet resonant cavity starting condition for oscillation, described laser exports the second light pulse.
7. laser according to claim 6, is characterized in that,
Described resonant cavity starting condition for oscillation be described laser resonant cavity in gain coefficient be greater than the intra resonant cavity loss factor of described laser.
8. laser according to claim 7, is characterized in that,
Export after described laser that the first light pulse or described laser export the second light pulse exports each light pulse at described laser, in the resonant cavity of described laser, gain coefficient all declines;
In described resonant cavity, gain coefficient gathers way along with the drive current increase of described pumping source and increases, the Q value of described acoustooptic Q-switching is along with the increase of the driving voltage of described acoustooptic Q-switching, and the intra resonant cavity loss factor of described laser reduces along with the increase of the Q value of acoustooptic Q-switching.
9. laser according to claim 1, is characterized in that,
Described controller also for:
Arrive it at the driving voltage of described acoustooptic Q-switching and maximumly bear voltage, and after the upper laser level of described gain media reversion particle is eliminated, the driving voltage of described acoustooptic Q-switching is adjusted downward to the first predetermined value, and the drive current of described pumping source is adjusted downward to the second predetermined value.
10. laser according to claim 1, is characterized in that,
Described gain media comprises helium, neon, ruby, GaAs, chromic sulfide zinc sulphide, rare earth ion and argon ion.
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| CN109405636A (en) * | 2018-10-24 | 2019-03-01 | 北京工业大学 | A kind of compacting interference method and apparatus of high-energy laser |
| CN111992544A (en) * | 2020-08-24 | 2020-11-27 | 中国科学院半导体研究所 | Acousto-optic Q double-pulse laser paint removing method |
| JP2022539447A (en) * | 2020-02-13 | 2022-09-09 | エルトラグローバル カンパニー リミテッド | Multiple laser pulse oscillation method and multiple laser pulse oscillation device using multiple Q-switch |
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