CN2891408Y - Thermal induced depolarization compensated resonant cavity of high power electric dimming Q solid laser - Google Patents
Thermal induced depolarization compensated resonant cavity of high power electric dimming Q solid laser Download PDFInfo
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- CN2891408Y CN2891408Y CN 200620040979 CN200620040979U CN2891408Y CN 2891408 Y CN2891408 Y CN 2891408Y CN 200620040979 CN200620040979 CN 200620040979 CN 200620040979 U CN200620040979 U CN 200620040979U CN 2891408 Y CN2891408 Y CN 2891408Y
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Abstract
A thermal depolarization compensation resonator for electro-optic Q-switched solid laser with high power comprises a laser resonator, which comprises an output mirror, laser mediums, and a total reflector. The thermal depolarization compensation resonator is characterized in that the optical axis of the laser resonator is provided with a lambada/4 wave plate, a Polarization plate and a first electro-optic Q-switch by turns from the laser mediums to the output mirror. The first electro-optic Q-switch comprises two Pockels boxes holding a ninety-degree quartz polarization rotating plate. The Polarization plate and the optical axis form a Brewster angle. The first polarization branch comprises the first electro-optic Q-switch and the output mirror. The other direction forming a Brewster angle with the polarization plate is also provided with a second electro-optic Q-switch, which comprises two Pockels boxes holding a ninety-degree quartz polarization rotating plate. The second polarization branch comprises the second electro-optic Q-switch and the other total reflector. The fast and slow axes of the lambada/4 wave plate form an angle of 45 degrees with the horizontal polarization direction or the vertical polarization direction of the light. The utility model not only compensates the thermal depolarization wear, but also guarantees the output of the linear polarized light.
Description
Technical field
The utility model belongs to laserresonator, is a kind of thermal depolarization compensation resonant cavity of high-power electric light Q-switch solid laser.
Background technology
General high-power electric light Q-switch solid laser cavity resonator structure as shown in Figure 1, among the figure: 1 is outgoing mirror, 2 is the Pockels box, 3 is λ/4 wave plates, 4 is polarizer, 5 is laser medium, and 6 is total reflective mirror, and 7 are the thermal depolarization loss of shaking, because the thermal birefringence effect of crystal bar and Pockels box, the linearly polarized light that can cause the parallel direction that produces by polarizer is during by crystal bar, and polarization state changes, and no longer is linearly polarized photon, during so once more by polarizer, the vertical polarization component will be reflected out outside the chamber, cause energy loss, i.e. the thermic depolarization loss of shaking.In order to reduce even to eliminate this loss, the S.Z.Kurtev of the laser technology research institute of Sofia University of Bulgaria, 0.E.Denchev, with people such as S.D.Savov thermally induced birefringence compensation resonant cavity structure shown in Figure 2 (list of references S.Z.Kurtev has been proposed, 0.E.Denhev and S.D.Savov, Effects of thermally inducedbirefringence in high-output-power electro-optically, Applied Optics, Vol.32, No.3, P278～285,1993).This structure adopts ring modulator, is made up of polarizer 4, total reflective mirror 6, two identical Pockels boxes and one 90 degree quartz polarization revolving fragment, and 1 is outgoing mirror, and 5 is gain medium.In this structure, oscillation light is through polarizer 4, and the vertical polarization component is polarized sheet 4 reflections, passes through total reflective mirror 6 and Pockels box then, produces the phase shift of π, and the polarization direction is revolved and turn 90 degrees, and sees through polarizer and enter gain media behind total reflective mirror 6; And the horizontal polarization component will become vertical polarization through polarizer 4 through total reflective mirror 6 and Pockels box 2, turn back to polarizer 4 behind total reflective mirror 6, be reflected back toward gain media 5.Such two polarized components will all form vibration in the chamber, eliminated the loss of shaking of thermal depolarization that laser medium 5 produces.And the combination of two identical Pockels boxes 2 and one 90 degree quartz polarization revolving fragment 8 will compensate the thermal birefringence effect by Pockels box 2.According to the experimental result of list of references 1, this structure is obvious to the compensation effect of thermally induced birefringence, but its output is non-linearly polarized light, and needs during the laser of linearly polarized light uses in frequency translation etc., and this structure can not be suitable for.
Summary of the invention
The technical problems to be solved in the utility model is to overcome above-mentioned the deficiencies in the prior art, a kind of thermal depolarization compensation resonant cavity of high-power electric light Q-switch solid laser is provided, this resonant cavity had both compensated hot depolarization loss, and what guaranteed laser output again is linearly polarized light.
Thinking of the present utility model is: the utility model follows people's such as S.Z.Kurtev thinking, still keep level all in the chamber, to vibrate and the hot depolarization loss of unlikely generation with vertical two polarized components, but have only a polarized component to export, so both compensated hot depolarization loss, what guaranteed laser output again is linearly polarized light.
Technical solution of the present utility model is as follows:
A kind of thermal depolarization compensation resonant cavity of high-power electric light Q-switch solid laser, comprise by outgoing mirror, the laserresonator that laser medium and completely reflecting mirror constitute, be characterized on the optical axis in described laserresonator, be provided with a λ/4 wave plates successively from described laser medium to outgoing mirror, one polarizer and first electro-optical Q-switch of forming by two Pockels boxes and one 90 degree quartz polarization revolving fragment therebetween, this polarizer becomes Brewster's angle with described optical axis, described first electro-optical Q-switch and outgoing mirror constitute first polarization branch, also be provided with second electro-optical Q-switch of forming by two Pockels boxes and one 90 degree quartz polarization revolving fragment therebetween at the other direction that becomes Brewster's angle with described polarizer, this second electro-optical Q-switch and another completely reflecting mirror constitute second polarization branch, and the described λ/fast and slow axis of 4 wave plates and the horizontal polarization direction of light or vertical polarization are all at 45.
Resonant cavity principle and characteristics are described below:
1, the thermally induced birefringence of laser medium compensation: in electro-optical Q-switch one side, resonant cavity is divided into two branch roads, corresponding respectively vertical and horizontal polarization component.And two polarization branch have guaranteed all to vibrate and unlikely loss in the chamber through two polarized components of gain media generation, have compensated the thermal birefringence effect of laser medium.
2, the thermally induced birefringence of Pockels box compensation: each branch road all use two identical Pockels boxes and one 90 to spend thermal birefringence effect (the compensation principle document Christopher A.Ebbers and Stephan P.Velsko that sees reference, High average power KTiOPO that the quartz polarization revolving fragment compensates the Pockels box again
4Electro-optic Q-switch, Applied Physics Letters, Vol.67, No.5,593～595,1995).
3, the polarization of laser output: laser generation will be from the outgoing mirror output of one of them polarization branch, and the chamber mirror of another polarization branch is a total reflective mirror.Also can export in order to make another polarized component from outgoing mirror, place a λ/4 wave plates at laser medium one end, the polarised light round trip, twice through described λ/4 wave plates, to obtain the phase shift of π, the polarization direction is revolved and is turn 90 degrees, and such two polarized components will be changed mutually, all can outside outputing to the chamber, outgoing mirror obtain linearly polarized light output.
4, transfer Q principle and mode: the Pockels box in two branch roads is added the high-voltage signal that synchronous peak value is λ/8 voltages, during pressurization, two the Pockels box round trips of linearly polarized light in each branch road produce the phase shift of λ/2 altogether, the polarization direction is revolved and is turn 90 degrees, thereby when getting back to polarizer once more, to or reflect outside the chamber by transmission, can not form vibration; When not pressurizeing, the Pockels box does not produce phase shift, does not change polarization state when light returns polarizer, is polarized sheet reflection or transmission and returns in the chamber, forms vibration, output laser.Thereby this is one and moves back the pressure type electro-optical Q-switch.
Description of drawings
Fig. 1 is the existing electric-optically Q-switched resonant cavity schematic diagram that thermally induced birefringence is not compensated
Fig. 2 is existing to the thermally induced birefringence compensation, the electric-optically Q-switched resonant cavity schematic diagram of output non-linear polarization light
Fig. 3 is the structural representation of the thermal depolarization compensation resonant cavity of the high-power electric light Q-switch solid laser of the utility model
Among the figure: 1 is outgoing mirror, and 2 is the Pockels box, and 3 is λ/4 wave plates, and 4 is polarizer, and 5 is laser medium, and 6 is total reflective mirror, and 7 are the thermal depolarization loss of shaking, and 8 is 90 degree quartz polarization revolving fragments
Embodiment
See also Fig. 3, Fig. 3 is the structural representation of the thermal depolarization compensation resonant cavity of the high-power electric light Q-switch solid laser of the utility model, as seen from the figure, the thermal depolarization compensation resonant cavity of the high-power electric light Q-switch solid laser of the utility model, comprise by outgoing mirror 1, the laserresonator that laser medium 5 and completely reflecting mirror 6 constitute, on the optical axis of described laserresonator, be provided with a λ/4 wave plates 3 successively from described laser medium 5 to outgoing mirror 1, one polarizer 4 and first electro-optical Q-switch of forming by one 90 degree of two Pockels boxes, 2 clampings quartz polarization revolving fragment 8, this polarizer 4 becomes Brewster's angle with described optical axis, described first electro-optical Q-switch and outgoing mirror 1 constitute first polarization branch, also be provided with second electro-optical Q-switch of forming by one 90 degree of two Pockels boxes, 2 clampings quartz polarization revolving fragment 8 at other direction with 4 one-tenth Brewster's angles of described polarizer, this second electro-optical Q-switch and another completely reflecting mirror 6 constitute second polarization branch, and the described λ/fast and slow axis of 4 wave plates 3 and the horizontal polarization direction of light or vertical polarization are all at 45.
Laser generation of the present utility model will be from outgoing mirror 1 output of one of them polarization branch, and the chamber mirror of another polarization branch is a total reflective mirror 6.Also can export in order to make another polarized component from outgoing mirror 1, place a λ/4 wave plates 3 at an end of laser medium 5, the polarised light round trip, twice through described λ/4 wave plates 3, to obtain the phase shift of π, the polarization direction is revolved and is turn 90 degrees, and such two polarized components will be changed mutually, all can output to outside the chamber, obtain linearly polarized light output from outgoing mirror 1.
Adopted a kind of pressure type electro-optical Q-switch that moves back in the utility model device.Pockels box 2 in two branch roads is added the high-voltage signal that synchronous peak value is λ/8 voltages, during pressurization, two Pockels box 2 round trips of linearly polarized light in each branch road produce the phase shift of λ/2 altogether, the polarization direction is revolved and is turn 90 degrees, thereby when getting back to polarizer 4 once more, to or reflect outside the chamber by transmission, can not form vibration; When not pressurizeing, Pockels box 2 does not produce phase shift, does not change polarization state when light returns polarizer 4, is polarized sheet 4 reflections or transmission and returns in the chamber, forms vibration, output laser.
Claims (1)
1, a kind of thermal depolarization compensation resonant cavity of high-power electric light Q-switch solid laser, comprise by outgoing mirror (1), the laserresonator that laser medium (5) and completely reflecting mirror (6) constitute, it is characterized in that on the optical axis of described laserresonator, be provided with a λ/4 wave plates (3) successively from described laser medium (5) to outgoing mirror (1), one polarizer (4), reach first electro-optical Q-switch that one 90 degree quartz polarization revolving fragment (8) is therebetween formed by two Pockels boxes (2), this polarizer (4) becomes Brewster's angle with described optical axis, described first electro-optical Q-switch and outgoing mirror (1) constitute first polarization branch, becoming the other direction of Brewster's angle also to be provided with second electro-optical Q-switch of forming by two Pockels boxes (2) and one 90 degree quartz polarization revolving fragment (8) therebetween with described polarizer (4), this second electro-optical Q-switch and another completely reflecting mirror (6) constitute second polarization branch, and the described λ/fast and slow axis of 4 wave plates (3) and the horizontal polarization direction of light or vertical polarization are all at 45.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200620040979 CN2891408Y (en) | 2006-04-12 | 2006-04-12 | Thermal induced depolarization compensated resonant cavity of high power electric dimming Q solid laser |
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| CN 200620040979 CN2891408Y (en) | 2006-04-12 | 2006-04-12 | Thermal induced depolarization compensated resonant cavity of high power electric dimming Q solid laser |
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| CN2891408Y true CN2891408Y (en) | 2007-04-18 |
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| CN 200620040979 Expired - Fee Related CN2891408Y (en) | 2006-04-12 | 2006-04-12 | Thermal induced depolarization compensated resonant cavity of high power electric dimming Q solid laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762495A (en) * | 2014-01-29 | 2014-04-30 | 张立国 | Method for increasing laser thermal response speed and multi-terminal pump solid state laser |
| CN106451054A (en) * | 2016-11-29 | 2017-02-22 | 中国工程物理研究院激光聚变研究中心 | Thermal depolarization complete compensation device in multi-pass laser amplifier and use method of device |
-
2006
- 2006-04-12 CN CN 200620040979 patent/CN2891408Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762495A (en) * | 2014-01-29 | 2014-04-30 | 张立国 | Method for increasing laser thermal response speed and multi-terminal pump solid state laser |
| CN103762495B (en) * | 2014-01-29 | 2016-08-17 | 张立国 | Improve method and the multiterminal light-pumped solid state laser of LASER HEAT response speed |
| CN106451054A (en) * | 2016-11-29 | 2017-02-22 | 中国工程物理研究院激光聚变研究中心 | Thermal depolarization complete compensation device in multi-pass laser amplifier and use method of device |
| CN106451054B (en) * | 2016-11-29 | 2023-07-21 | 中国工程物理研究院激光聚变研究中心 | Thermal depolarization complete compensation device of multi-pass laser amplifier and application method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070418 |