CN103457146A - Method for determining orientation of crystal axis of titanium sapphire crystal - Google Patents
Method for determining orientation of crystal axis of titanium sapphire crystal Download PDFInfo
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- CN103457146A CN103457146A CN2013103987538A CN201310398753A CN103457146A CN 103457146 A CN103457146 A CN 103457146A CN 2013103987538 A CN2013103987538 A CN 2013103987538A CN 201310398753 A CN201310398753 A CN 201310398753A CN 103457146 A CN103457146 A CN 103457146A
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Abstract
The invention provides a method for determining orientation of a crystal axis of a titanium sapphire crystal. The method relates to devices of an 800nm laser seed source, a small-hole diaphragm, the titanium sapphire crystal, a titanium sapphire crystal frame and a Rochon prism. The method includes the steps that firstly, the small-hole diaphragm is utilized to limit beams of 800nm seed lasers, the laser beams pass through the titanium sapphire crystal fixed on the titanium sapphire crystal frame and pass through the calibrated Rochon prism, the titanium sapphire crystal is rotated, and then the orientation of the crystal axis of a titanium sapphire is determined according to the characteristic of emergent light of the Rochon prism. According to the method, orientation of the crystal axis of the titanium sapphire crystal can be accurately determined, and the polarization direction of seed light is strictly parallel to the orientation of the crystal axis of the titanium sapphire. The method is convenient to adjust, high in accuracy, simple, efficient, and high in practicability.
Description
Technical field
The present invention relates to laser amplification technique, particularly a kind of multi-pass amplifier based on titanium gem crystal determine the titanium gem crystal crystallographic axis towards method.
Background technology
Ultrashort ultra-intense laser is important tool and the research means of current Physical Experiment research.The ultrashort ultra-intense laser of function admirable is necessary condition and the guarantee of carrying out high field Physical Experiment research, for high power density physics, laser plasma physics, that the research fields such as plasma accelerator and x-ray laser provide is stable, laboratory facilities and technology platform reliably.This technology has obtained development by leaps and bounds since middle 1980s, comprises that each scientific and technological power of the world of China has set up the ultra-short pulse laser device that large-scale high power is clapped watt (PW) magnitude in succession.In femtosecond magnitude ultrafast laser system, it is main technology path that the chirped pulse based on titanium jewel (Ti:Sapphire) crystal amplifies (CPA); Therefore, the performance of titanium jewel plays vital effect to the generation of ultrashort superpower pulse.
Titanium gem crystal is a single shaft nonlinear crystal, the titanium jewel to the absorption of pump light and to the amplification of seed light all with crystallographic axis towards much relations are arranged.If the polarization direction of pump light is not parallel to the crystalline axis direction of titanium gem crystal, can affect the absorption efficiency of titanium jewel to pump light.Meanwhile, if the polarization direction of seed light is not parallel to the crystalline axis direction of titanium gem crystal, not only can affect the amplification efficiency of titanium jewel to seed light, and can bring due to the birefringence efficiency of titanium jewel the spectral modulation of seed light.The spectrum of seed light directly affects the compression of laser pulse, therefore with the seed light of spectrum adjusting, can have influence on the compressibility of pulse.Therefore, in high energy PW laser system, require the polarization direction of pump light and seed light consistent and strictly be parallel to the crystalline axis direction of titanium gem crystal.
At present, determine that the titanium gem crystal crystallographic axis comprises towards main method:
(1) adopt the pumping source of high repetition frequency, the absorption of test titanium jewel to pump light.The laser that pumping source is sent is incident to the titanium gem crystal surface, after titanium gem crystal, with energy meter, measures remaining pump energy.Rotate titanium gem crystal, stop operating when remaining pump energy is the most weak, fix titanium gem crystal.Because the energy of pumping source has fluctuation, therefore, the method precision is very low, and the device needed is more.
(2) adopt very accurate grating spectrograph, while on the laser spectroscopy of observing by the titanium jewel, having regular modulation, start to rotate titanium gem crystal, stop operating until modulate while disappearing, fix titanium gem crystal.But the method needs the laser Multiple through then out, obvious modulation phenomenon just can occur in titanium gem crystal, and needs very accurate grating spectrograph, so the method complex steps, and very high to requirement on devices.
Summary of the invention
The object of the invention is to overcome the above-mentioned existing shortcoming of titanium gem crystal crystallographic axis towards method of determining; Provide a kind of definite titanium gem crystal crystallographic axis towards method, the method is simple to operate, scientific and effective, precision is high and practical.
Technical solution of the present invention is as follows:
A kind of definite titanium gem crystal crystallographic axis towards method, the device adopted comprises 800nm laser seed source, aperture, titanium gem crystal undetermined, titanium gem crystal frame and Rochon prism, its characteristics are that the method comprises the following steps:
1. place described aperture in the laser optical path produced in described 800nm laser seed source, the polarization state direction in described 800nm laser seed source is known;
2. place Rochon prism in the laser optical path after described aperture, make described laser beam by the center of described Rochon prism, rotate described Rochon prism, and after described Rochon prism, utilize blank sheet of paper to observe laser spot, when laser spot is unique and the direction of propagation does not change, fixing described Rochon prism no longer rotates; Then described Rochon prism is removed from light path;
3. described titanium gem crystal is arranged on described titanium gem crystal frame, places described titanium gem crystal in the light path after described aperture, and makes described laser beam by the center of described titanium gem crystal;
4. place described Rochon prism in the laser optical path after described titanium gem crystal, make described laser beam by the center of described Rochon prism, rotate described titanium gem crystal, after described Rochon prism, utilize blank sheet of paper to observe laser spot, when laser spot is unique and the direction of propagation does not change, fix described titanium gem crystal; The crystallographic axis of titanium gem crystal towards the polarization direction that is parallel to described 800nm laser seed source.
Principle of the present invention is:
The titanium jewel is the nonlinear crystal of a single shaft.When the laser polarization state of incident is not parallel to the titanium gem crystal crystalline axis direction, will laser by the time produce birefringence effect, thereby change the polarization state of incident laser.Rochon prism is a kind of high accuracy analyzing device, and precision can reach 10
-5, when the polarization state of incident laser and the determined polarization state of Rochon prism there will be obvious birefringence, emitting laser can be divided into two bundle laser when inconsistent, and the direction of propagation is contrary.Because the precision of Rochon prism is very high, even very little variation appears in the laser polarization state of incident, Rochon prism also can be easy to detect.Therefore, we can first pass through the laser calibration Rochon prism of known polarization state, and the laser polarization state before making the determined polarization state of Rochon prism and inciding the titanium jewel is consistent.Then allow laser pass through titanium gem crystal, if laser polarization is not parallel to titanium jewel crystalline axis direction, the polarization state of emitting laser can change, and now through Rochon prism, can detect the variation of polarization.Then rotate titanium gem crystal, when the crystalline axis direction of titanium jewel is parallel to the laser polarization of incident, unique through Rochon prism emitting laser luminous point, and the direction of propagation does not change.Now the crystallographic axis of titanium jewel is towards the polarization direction that is parallel to incident laser.
With method formerly, compare, the present invention has following outstanding feature:
1, the method only needs a Rochon prism, very simple.
2, the Rochon prism after the use calibration is as detection means, and precision is high, can reach 10
-5;
3, the crystallographic axis that the method not only can be determined titanium gem crystal towards, can also guarantee that the polarization state of incident laser strictly is parallel to the crystalline axis direction of titanium gem crystal, can guarantee the effective amplification of titanium gem crystal to incident laser, avoid spectral modulation.
4, the method is portable strong, not only is applicable to titanium gem crystal, and is applicable to other nonlinear crystal.
The accompanying drawing explanation
Fig. 1 be the present invention utilize Rochon prism determine the titanium gem crystal crystallographic axis towards simple and easy index path.
Embodiment
Please first consult Fig. 1, Fig. 1 be the present invention determine the titanium gem crystal crystallographic axis towards the index path of method, the present invention determine the titanium gem crystal crystallographic axis towards method, the device adopted comprises 800nm laser seed source 1, aperture 2, titanium gem crystal 3, titanium gem crystal frame 4, Rochon prism 5, and the method comprises the following steps:
1. place aperture 2 in the laser optical path produced in described 800nm laser seed source 1, make the laser beam center through described aperture 2, so that described laser beam is limit to bundle;
2. place Rochon prism 5 in the laser optical path after described aperture 2, make described laser beam by the center of described Rochon prism 5, rotate described Rochon prism 5, after described Rochon prism 5, utilize blank sheet of paper to observe laser spot, when laser spot is unique and the direction of propagation does not change, fix described Rochon prism 5; Then described Rochon prism 5 is removed.
3. at the rear placement titanium gem crystal 3 of described aperture 2, and make described laser beam by the center of described titanium gem crystal 3, described titanium gem crystal 3 is fixed on titanium gem crystal frame 4.
4. place described Rochon prism 5 in the laser optical path after described titanium gem crystal 3, make described laser beam by the center of described Rochon prism 5, rotate described titanium gem crystal 3, after described Rochon prism 5, utilize blank sheet of paper to observe laser spot, when laser spot is unique and the direction of propagation does not change, fix described titanium gem crystal 3; The crystallographic axis of titanium gem crystal towards the polarization direction that is parallel to described 800nm laser seed source.
Claims (1)
- A definite titanium gem crystal crystallographic axis towards method, the device adopted comprises 800nm laser seed source (1), aperture (2), titanium gem crystal undetermined (3), titanium gem crystal frame (4) and Rochon prism (5), it is characterized in that the method comprises the following steps:1. place described aperture (2) in the laser optical path produced in described 800nm laser seed source (1), so that described laser beam is limit to bundle, the polarization state direction in described 800nm laser seed source (1) is known;2. place Rochon prism (5) in the laser optical path after described aperture (2), make described laser beam by the center of described Rochon prism (5), rotate described Rochon prism (5), and after described Rochon prism (5), utilize blank sheet of paper to observe laser spot, when laser spot is unique and the direction of propagation does not change, fixing described Rochon prism (5) no longer rotates; Then described Rochon prism (5) is removed from light path;3. will be arranged on the light path after titanium gem crystal (3) on described titanium gem crystal frame (4) is placed in described aperture (2), and make described laser beam by the center of described titanium gem crystal (3);4. place described Rochon prism (5) in the laser optical path after described titanium gem crystal (3), make described laser beam by the center of described Rochon prism (5), rotate described titanium gem crystal (3), after described Rochon prism (5), utilize blank sheet of paper to observe laser spot, when laser spot is unique and the direction of propagation does not change, fix described titanium gem crystal (3); The crystallographic axis of titanium gem crystal towards the polarization direction that is parallel to described 800nm laser seed source (1).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366497A (en) * | 2020-11-23 | 2021-02-12 | 中国科学院上海光学精密机械研究所 | Laser pulse width compression system with preset space chirp |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63155006A (en) * | 1986-12-19 | 1988-06-28 | Fujitsu Ltd | Polarizing element |
| CN102707542A (en) * | 2012-06-04 | 2012-10-03 | 中国科学院上海光学精密机械研究所 | Method for regulating best matching state of type-II KDP (Potassium Dihydrogen Phosphate) crystal for frequency multiplication of infrared light |
| CN202948213U (en) * | 2012-12-12 | 2013-05-22 | 福州高意光学有限公司 | Polarization polarizer |
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2013
- 2013-09-05 CN CN201310398753.8A patent/CN103457146B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63155006A (en) * | 1986-12-19 | 1988-06-28 | Fujitsu Ltd | Polarizing element |
| CN102707542A (en) * | 2012-06-04 | 2012-10-03 | 中国科学院上海光学精密机械研究所 | Method for regulating best matching state of type-II KDP (Potassium Dihydrogen Phosphate) crystal for frequency multiplication of infrared light |
| CN202948213U (en) * | 2012-12-12 | 2013-05-22 | 福州高意光学有限公司 | Polarization polarizer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366497A (en) * | 2020-11-23 | 2021-02-12 | 中国科学院上海光学精密机械研究所 | Laser pulse width compression system with preset space chirp |
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