CN105261928A - Pulse laser beam combiner based on domain inversion electro-optic crystal, and method thereof - Google Patents
Pulse laser beam combiner based on domain inversion electro-optic crystal, and method thereof Download PDFInfo
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- CN105261928A CN105261928A CN201510753676.2A CN201510753676A CN105261928A CN 105261928 A CN105261928 A CN 105261928A CN 201510753676 A CN201510753676 A CN 201510753676A CN 105261928 A CN105261928 A CN 105261928A
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Abstract
The invention discloses a pulse laser beam combiner based on a domain inversion electro-optic crystal, and a method thereof. The pulse laser beam combiner based on a domain inversion electro-optic crystal comprises an electro-optic crystal with domain inversion, a drive circuit, at least two lasers and a synchronous machine, wherein the electro-optic crystal is provided with an upper bottom surface and a lower bottom surface which are parallel with each other; each domain structure is arranged in order along the direction of the longest edge of the electro-optic crystal; the difference between the spontaneous polarization directions of the adjacent domain structures is 180DEG; two plate electrodes of the drive circuit are respectively connected with the upper bottom surface and the lower bottom surface of the electro-optic crystal; the output ports of the lasers are opposite to the plane of incidence of the electro-optic crystal, and are arranged at the position being same to the incidence position on the plane of incidence; and the transmission directions of emitted pulse lasers are the same. The pulse laser beam combiner based on a domain inversion electro-optic crystal, and the method thereof utilize the optical deflection generated from the domain inversion electro-optic crystal, and combine the optical deflection with the features of pulse lasers and the synchronous machine to realize multi-path pulse laser beam combination through a first-level beam combiner.
Description
Technical field
The present invention relates to superpower laser field, be specifically related to a kind of pulse laser beam merging apparatus based on periodical poling electrooptic crystal and method thereof.
Background technology
Along with development and the maturation of laser technology, high power laser light has to be applied more and more widely, has had a deep effect on the development of multiple industry.Divide high power laser light by working method and be mainly divided into high-peak power laser (i.e. high energy pulse laser) and high-average power laser.
For high energy pulse laser, require that laser has certain repetition rate in multiple application.But directly improve the repetition rate of high energy pulse laser operation, serious thermal effect will be produced, thus affect the performance of laser, even cause laser to export pulse energy and decline or can not work.For high-average power laser, application demand constantly proposes requirements at the higher level to laser output power, and single laser power ascension is limited, is difficult to realize higher average output power.
Therefore, no matter be for high energy pulse laser or for high-average power laser, the repetition rate improving pulse laser is all need the problem of solution badly.
Summary of the invention
For above-mentioned problems of the prior art, the present inventor thinks that close bundle by pulse laser solves this problem, for high energy pulse laser, sequential closes the repetition rate that bundle can improve laser pulse output, for high-average power laser, sequential closes the average power that bundle can improve Output of laser.The invention provides a kind of pulse laser beam merging apparatus based on periodical poling electrooptic crystal and method thereof, the reverse light deflection utilizing periodical poling electrooptic crystal to produce of apparatus and method of the present invention, and its characteristic with pulse laser and synchronous motor are combined, multipath pulse laser can be realized by one-level beam merging apparatus and close bundle.
For achieving the above object, the invention provides following technical scheme:
Based on a pulse laser beam merging apparatus for periodical poling electrooptic crystal, comprising:
There is the electrooptic crystal of periodical poling, described electrooptic crystal has the upper bottom surface and bottom surface that are parallel to each other, the spontaneous polarization direction of described electrooptic crystal is vertical with bottom surface with upper bottom surface, the domain structure of described electrooptic crystal is arranged in order along the longest edge direction of described electrooptic crystal, and the spontaneous polarization direction of adjacent domain structure differs 180 °;
Drive circuit, 2 battery lead plates of described drive circuit match with the upper plate of described electrooptic crystal and lower shoe respectively;
At least 2 lasers, the delivery outlet of described laser is relative with the plane of incidence of described electrooptic crystal, the incoming position of pulse laser on the plane of incidence that described laser exports is arranged as straight line, the Exit positions of pulse laser on exit facet that described laser exports is same point, the pulse laser transmission direction of outgoing is identical, and the described plane of incidence and exit facet are the side at Width place;
Synchronous motor, described drive circuit is connected with described synchronous motor respectively with whole lasers.
Further, described domain structure is triangle, and the interface slope size of adjacent described domain structure is equal and direction is contrary.
Further, formed by the interface of adjacent described domain structure and the longest edge of described electrooptic crystal, acute angle is 70-80 °.
Further, formed by the interface of adjacent domain structure and the longest edge of electrooptic crystal, acute angle is 75 °.
Further, described electrooptic crystal comprises 5-20 domain structure.
Further, described electrooptic crystal is lithium columbate crystal or lithium tantalate.
Utilize described above based on the conjunction Shu Fangfa that the pulse laser beam merging apparatus of periodical poling electrooptic crystal carries out, comprise the following steps:
(1) delivery outlet of laser is relative with the plane of incidence of electrooptic crystal, and the incoming position of pulse laser on the plane of incidence that laser exports is arranged as straight line, and laser is controlled by synchronous motor, repeats to export pulse laser in the different moment;
(2) when the pulse laser exported by various lasers is not when inciding the plane of incidence of electrooptic crystal in the same time, synchronous motor controls drive circuit and applies different voltage to the electrooptic crystal with domain structure;
(3) described pulse laser is by the exit facet outgoing of electrooptic crystal, and Exit positions is same point, and the transmission direction of outgoing afterpulse laser is identical, through too drastic light collimating element after outgoing, obtains closing bundle of pulsed laser.
Further, the pulse laser of wherein 1 described laser output is perpendicular to the plane of incidence, and when this pulse laser incides described electrooptic crystal, described drive circuit is zero to the voltage that described electrooptic crystal applies.
Further, described domain structure is triangle, and the interface slope size of adjacent described domain structure is equal and direction is contrary.
Further, formed by the interface of adjacent described domain structure and the longest edge of described electrooptic crystal, acute angle is 70-80 °.
Beneficial effect of the present invention is as follows:
1, the electrooptic crystal of periodical poling, drive circuit are combined with synchronous motor, drive circuit applies voltage to electrooptic crystal, synchronous motor controls to execute alive size, direction and moment, ingenious reverse utilization has the light deflection characteristic of the electrooptic crystal of domain structure and the feature of pulse laser, multipath pulse laser is closed Shu Chengyi road laser, under the prerequisite not reducing pulse energy, improve repetition rate and the average power of pulse laser output;
2, by synchronous motor to the control in multipath pulse laser sequential, identical or different conjunction bundle of pulsed laser interpulse period can be obtained;
3, can be realized the conjunction bundle of multipath pulse laser by beam merging apparatus of the present invention, as needed the pulse laser of more high repetition frequency, beam merging apparatus of the present invention is carried out plural serial stage can be realized;
4, the pulse laser that laser exports for the pulse of reruning, also can be able to be single pulse, can have the characteristics such as different pulse shape, pulse duration, wavelength, spectral width, chirping characteristics, amplitude.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is electrooptic crystal of the present invention and laser positions relation schematic diagram;
Fig. 3 is that the present invention closes Shu Qianhou pulse laser schematic diagram.
In figure: 1-electrooptic crystal, 11-domain structure, 12-domain wall, 13-spontaneous polarization direction, 2-drive circuit, 21-battery lead plate, 22-battery lead plate, 31-laser, 32-laser, 33-laser, 310-pulse laser, 320-pulse laser, 330-pulse laser, 4-synchronous motor, 5-laser alignment element, 6-close bundle of pulsed laser.
Embodiment
Technical scheme of the present invention is understood better in order to make those skilled in the art; below in conjunction with accompanying drawing of the present invention; clear, complete description is carried out to technical scheme of the present invention; based on the embodiment in the application; other roughly the same embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all should belong to the scope of the application's protection.
Embodiment one:
As depicted in figs. 1 and 2, a kind of pulse laser beam merging apparatus based on periodical poling electrooptic crystal, comprises electrooptic crystal 1, drive circuit 2, laser 31, laser 32, laser 33, synchronous motor 4, laser alignment element 5.
Electrooptic crystal 1 has multiple triangle domain structure 11, adjacent domain structure 11 spontaneous polarization direction 13 differs 180 °, described electrooptic crystal 1 has the upper bottom surface and bottom surface that are parallel to each other, the spontaneous polarization direction 13 of electrooptic crystal 1 is vertical with bottom surface with upper bottom surface, the domain structure 11 of electrooptic crystal 1 is arranged in order along the longest edge direction of electrooptic crystal 1, the transmission direction of pulse laser is also the long side direction along electrooptic crystal 1, passes through each domain structure 11 successively during pulse laser transmission; The interface of adjacent domain structure 11 is domain wall 12, and the slope size of each domain wall 12 is equal, and direction is contrary, and the shape of the present embodiment domain structure 11 can simplify computational process, is convenient to calculate the incidence angle of pulse laser at each domain wall 12 place and the angle of emergence; Formed by the longest edge of domain wall 12 and electrooptic crystal 1, the angle of sharp angle α is 70-80 °, this angle is arranged can will be divided into domain structure 11 as much as possible in electrooptic crystal 1, simultaneously because domain structure 11 queueing discipline is simple, when obtaining domain structure 11, procurement process is too not complicated; Preferably, formed by the longest edge of domain wall 12 and electrooptic crystal 1, the angle of sharp angle α is 75 °, and when being set to 75 °, the number of domain structure 11 and its procurement process all reach optimum.The number of domain structure 11 is more, and the angle between pulse laser 330 and pulse laser 310 is larger, is more conducive to winning space and places more laser, and the pulse laser realizing more multichannel closes bundle.Described electrooptic crystal 1 comprises 5-20 domain structure 11, the present embodiment preferably selects 7 domain structures 11, those skilled in the art it has been generally acknowledged that as domain structure < 20, along with the increase of domain structure 11 number, the deflection angle of laser increases gradually, the present inventor chances in an experiment, when selection 7 domain structures 11, angle between pulse laser 330 and pulse laser 310 is larger, increase the number of domain structure 11 again, the increase DeGrain of angle, need on the contrary to increase the size of electrooptic crystal 1 and the voltage value of applying, increase and close Shu Chengben, domain structure more than 11 simultaneously, alive numerical value is executed in calculating, the position of pulse laser incidence, angle is more loaded down with trivial details, be unfavorable for the control of beam merging apparatus, domain structure 11 is fewer, and the accuracy of result of calculation just can not be guaranteed.
Described electrooptic crystal 1 is lithium columbate crystal or lithium tantalate, and these two kinds of ferroelectric crystal fast response times, controllability are good, highly sensitive, noninertia.
The battery lead plate 21 of described drive circuit 2 and battery lead plate 22 match with the upper plate of electrooptic crystal 1 and lower shoe respectively, the electric field identical or contrary with its spontaneous polarization direction 13 is produced in electrooptic crystal 1 inside, domain structure 11 photoelectric coefficient adjacent due to electrooptic crystal 1 is on the contrary positive and negative, therefore refractive index is also different, and only have the size of the electric field ability effective influence refractive index of polarised direction, extra electric field direction is parallel with polarised direction, the magnitude of voltage that drive circuit applies can be reduced, economize on resources;
As shown in Figure 2, described laser 31, laser 32 are relative with the plane of incidence of electrooptic crystal 1 with the delivery outlet of laser 33, pulse laser 310, pulse laser 320 and the incoming position of pulse laser 330 on the plane of incidence are arranged as straight line, namely the Width along electrooptic crystal 1 arranges, Exit positions on exit facet is same point, the pulse laser transmission direction of outgoing is identical, the described plane of incidence and exit facet are the side at Width place, and Width is the direction all vertical with upper bottom surface with longest edge.Laser 31, laser 32 and laser 33 front-back staggered arrangement (is front near electrooptic crystal 1), with conserve space, in electrooptic crystal 1 situation using same size, discharges more lasers, realizes the conjunction bundle of more multichannel light beam.Incident pulse laser 320 and 330 is through all domain structures 11 of electrooptic crystal 1, all reflect at each domain wall 12 place, and pulse laser 320 and pulse laser 330 are drawn close to pulse laser 310 all gradually, finally close bundle for a branch of at exit position 3 road pulse laser; The pulse laser that laser 31, laser 32 and laser 33 export for the pulse of reruning, also can be able to be single pulse, can have the characteristics such as different pulse shape, pulse duration, wavelength, spectral width, chirping characteristics, amplitude.If any more laser, can also about laser 31 symmetric arrays, reach the object of the pulse laser of more multichannel being closed bundle.
Described drive circuit 2, laser 31, laser 32 are all connected with synchronous motor 4 with laser 33, the moment that laser 31, laser 32 and laser 33 export pulse laser is all controlled by synchronous motor 4, the alive moment executed by drive circuit 2 and voltage swing is also controlled by synchronous motor 4, only controlled to not only simplify beam merging apparatus by a synchronous motor 4, avoid the time difference between different synchronous motor simultaneously, improve the precision that beam merging apparatus is controlled;
Laser alignment element 5 is positioned at the side of exit facet, perpendicular to the pulse laser of outgoing, for reducing the angle of divergence of closing bundle of pulsed laser 6, obtains the conjunction bundle of pulsed laser 6 of linear transmission.
Utilize described above based on the conjunction Shu Fangfa that the pulse laser beam merging apparatus of periodical poling electrooptic crystal carries out, comprise the following steps:
(1) laser 31, laser 32 are all relative with the plane of incidence of electrooptic crystal 1 with the delivery outlet of laser 33, the pulse laser 320 that the pulse laser 310 that laser 31 exports, laser 32 export and the incoming position of pulse laser 330 on the plane of incidence that laser 33 exports are arranged as straight line, and this linear vertical is in direction of an electric field, laser 31, laser 32 and laser 33 control by synchronous motor 4, repeat to export pulse laser 310, pulse laser 320 and pulse laser 330 in the different moment;
(2) pulse laser 310, pulse laser 320 and pulse laser 330 be not in the same time through electrooptic crystal 1, when the pulse laser 310 exported by laser 31 incides the plane of incidence of electrooptic crystal 1, the voltage that synchronous motor 4 controls drive circuit 2 pairs of electrooptic crystals 1 applyings is zero, when the pulse laser 320 exported by laser 32 incides the plane of incidence of electrooptic crystal 1, synchronous motor 4 controls drive circuit 2 pairs of electrooptic crystals 1 and applies lower voltage, when the pulse laser 330 exported by laser 33 incides the plane of incidence of electrooptic crystal 1, synchronous motor 4 controls drive circuit 2 pairs of electrooptic crystals 1 and applies higher voltage, different applying voltage makes pulse laser 310, pulse laser 320 and pulse laser 330 have different transmission paths in electrooptic crystal 1,
In addition, pulse laser 310, pulse laser 320 and pulse laser 330 are the pulse laser of repetition rate, above-mentioned steps only describes the conjunction bundle process of each one of them pulse of pulse laser, for its after pulse, only need repeat above-mentioned steps can realize closing bundle, improve repetition rate and average power fast and effectively;
(3) described pulse laser 310, pulse laser 320 and pulse laser 330 be not in the same time by the exit facet outgoing of electrooptic crystal 1, and Exit positions is same point, after outgoing, the transmission direction of 3 road pulse lasers is identical, through too drastic light collimating element 5 after outgoing, obtain closing bundle of pulsed laser 6.By the control in synchronous motor 4 pairs of multipath pulse laser sequential, identical or different conjunction bundle of pulsed laser 6 interpulse period can be obtained.
The electrooptic crystal 1 of periodical poling, drive circuit 2 combine with synchronous motor 4 by the present invention, drive circuit 2 applies voltage to electrooptic crystal 1, synchronous motor 4 controls to execute alive size, direction and moment, ingenious reverse utilization has the light deflection characteristic of the electrooptic crystal 1 of domain structure 11 and the feature of pulse laser, multipath pulse laser is closed Shu Chengyi road laser, under the prerequisite not reducing pulse energy, improve repetition rate and the average power of pulse laser output.
As shown in Figure 3, laser 31 exports the pulse laser 310 of rectangle, laser 32 exports leg-of-mutton pulse laser 320, and laser 33 exports the pulse laser 330 of rectangle, after closing bundle, can obtain closing bundle of pulsed laser 6.If desired more multipath pulse laser closes bundle, beam merging apparatus of the present invention can be carried out plural serial stage, is about to close bundle of pulsed laser 6 again as incident pulse laser, incides on next stage electrooptic crystal.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (10)
1., based on a pulse laser beam merging apparatus for periodical poling electrooptic crystal, it is characterized in that, comprising:
There is the electrooptic crystal of periodical poling, described electrooptic crystal has the upper bottom surface and bottom surface that are parallel to each other, the spontaneous polarization direction of described electrooptic crystal is vertical with bottom surface with upper bottom surface, the domain structure of described electrooptic crystal is arranged in order along the longest edge direction of described electrooptic crystal, and the spontaneous polarization direction of adjacent domain structure differs 180 °;
Drive circuit, 2 battery lead plates of described drive circuit match with the upper plate of described electrooptic crystal and lower shoe respectively;
At least 2 lasers, the delivery outlet of described laser is relative with the plane of incidence of described electrooptic crystal, the incoming position of pulse laser on the plane of incidence that described laser exports is arranged as straight line, the Exit positions of pulse laser on exit facet that described laser exports is same point, the pulse laser transmission direction of outgoing is identical, and the described plane of incidence and exit facet are the side at Width place;
Synchronous motor, described drive circuit is connected with described synchronous motor respectively with whole lasers.
2. the pulse laser beam merging apparatus based on periodical poling electrooptic crystal according to claim 1, it is characterized in that, described domain structure is triangle, and the interface slope size of adjacent described domain structure is equal and direction is contrary.
3. the pulse laser beam merging apparatus based on periodical poling electrooptic crystal according to claim 2, is characterized in that, formed by the interface of adjacent described domain structure and the longest edge of described electrooptic crystal, acute angle is 70-80 °.
4. the pulse laser beam merging apparatus based on periodical poling electrooptic crystal according to claim 3, is characterized in that, formed by the adjacent interface of described domain structure and the longest edge of electrooptic crystal, acute angle is 75 °.
5. according to the arbitrary described pulse laser beam merging apparatus based on periodical poling electrooptic crystal of claim 1-4, it is characterized in that, described electrooptic crystal comprises 5-20 described domain structure.
6. the pulse laser beam merging apparatus based on periodical poling electrooptic crystal according to claim 5, is characterized in that, described electrooptic crystal is lithium columbate crystal or lithium tantalate.
7. utilize as arbitrary in claim 1-6 as described in the conjunction Shu Fangfa carried out based on the pulse laser beam merging apparatus of periodical poling electrooptic crystal, it is characterized in that, comprise the following steps:
(1) delivery outlet of laser is relative with the plane of incidence of electrooptic crystal, and the incoming position of pulse laser on the plane of incidence that laser exports is arranged as straight line, and laser is controlled by synchronous motor, repeats to export pulse laser in the different moment;
(2) when the pulse laser exported by various lasers is not when inciding the plane of incidence of electrooptic crystal in the same time, synchronous motor controls drive circuit and applies different voltage to the electrooptic crystal with domain structure;
(3) described pulse laser is by the exit facet outgoing of electrooptic crystal, and Exit positions is same point, and the transmission direction of outgoing afterpulse laser is identical, through too drastic light collimating element after outgoing, obtains closing bundle of pulsed laser.
8. conjunction Shu Fangfa according to claim 7, it is characterized in that, wherein the pulse laser of 1 described laser output is perpendicular to the plane of incidence, and when this pulse laser incides described electrooptic crystal, described drive circuit is zero to the voltage that described electrooptic crystal applies.
9. conjunction Shu Fangfa according to claim 8, it is characterized in that, described domain structure is triangle, and the interface slope size of adjacent described domain structure is equal and direction is contrary.
10. conjunction Shu Fangfa according to claim 9, is characterized in that, formed by the interface of adjacent described domain structure and the longest edge of described electrooptic crystal, acute angle is 70-80 °.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412436A (en) * | 2019-07-23 | 2019-11-05 | 大连世有电力科技有限公司 | Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement |
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| JPH05346602A (en) * | 1992-06-16 | 1993-12-27 | Pioneer Electron Corp | Wavelength conversion element |
| US6175578B1 (en) * | 1995-10-26 | 2001-01-16 | Mitsubishi Cable Industries, Ltd. | Optical device |
| US20050195473A1 (en) * | 2004-03-05 | 2005-09-08 | Nee Phillip T. | Selective amplification and/or filtering of frequency bands via nonlinear optical frequency conversion in aperiodic engineered materials |
| CN205159784U (en) * | 2015-11-06 | 2016-04-13 | 中国工程物理研究院激光聚变研究中心 | Pulsed laser beam combining device based on farmland reversal electro -optical crystal |
-
2015
- 2015-11-06 CN CN201510753676.2A patent/CN105261928A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05346602A (en) * | 1992-06-16 | 1993-12-27 | Pioneer Electron Corp | Wavelength conversion element |
| US6175578B1 (en) * | 1995-10-26 | 2001-01-16 | Mitsubishi Cable Industries, Ltd. | Optical device |
| US20050195473A1 (en) * | 2004-03-05 | 2005-09-08 | Nee Phillip T. | Selective amplification and/or filtering of frequency bands via nonlinear optical frequency conversion in aperiodic engineered materials |
| CN205159784U (en) * | 2015-11-06 | 2016-04-13 | 中国工程物理研究院激光聚变研究中心 | Pulsed laser beam combining device based on farmland reversal electro -optical crystal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412436A (en) * | 2019-07-23 | 2019-11-05 | 大连世有电力科技有限公司 | Bushing shell for transformer dielectric loss frequency spectrum detection device based on photoelectric voltage measurement |
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