CN103457146B - Determine titanium gem crystal crystallographic axis towards method - Google Patents
Determine titanium gem crystal crystallographic axis towards method Download PDFInfo
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- CN103457146B CN103457146B CN201310398753.8A CN201310398753A CN103457146B CN 103457146 B CN103457146 B CN 103457146B CN 201310398753 A CN201310398753 A CN 201310398753A CN 103457146 B CN103457146 B CN 103457146B
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Abstract
Determine titanium gem crystal crystallographic axis towards a method, the device adopted comprises 800nm laser seed source, aperture, titanium gem crystal, titanium gem crystal frame, Rochon prism.The method first utilizes aperture to carry out limit bundle to the seed laser of 800nm, the titanium gem crystal of laser beam through being fixed on titanium gem crystal frame, then through the Rochon prism calibrate, rotation titanium gem crystal, according to the feature of Rochon prism emergent light determine the crystallographic axis of Ti∶Sapphire laser towards.The present invention not only can accurately determine titanium gem crystal crystallographic axis towards, and ensure that the polarization direction of seed light be strictly parallel to Ti∶Sapphire laser crystallographic axis towards.The present invention have easy to adjust, precision is high, simply efficient, practical feature.
Description
Technical field
The present invention relates to laser amplification technique, particularly a kind of multi-pass amplifier determination titanium gem crystal crystallographic axis based on titanium gem crystal towards method.
Background technology
Ultrashort and ultrahigh laser is important tool and the research means of current Physical Experiment research.The ultrashort and ultrahigh laser of function admirable is necessary condition and the guarantee of carrying out Strong-field physics experimental study, for high power density physics, laser plasma physics, the research field such as plasma accelerator and x-ray laser provides stable, reliable laboratory facilities and technology platform.This technology has obtained development by leaps and bounds since middle 1980s, and each scientific and technological power of the world comprising China establishes the ultra-short pulse laser device that large-scale high power claps watt (PW) magnitude in succession.In femtosecond magnitude ultrafast laser system, the chirped pulse amplification (CPA) based on Ti∶Sapphire laser (Ti:Sapphire) crystal is main technology path; Therefore, the generation of performance to ultrashort superpower pulse of Ti∶Sapphire laser plays vital effect.
Titanium gem crystal is a single shaft nonlinear crystal, the absorption of Ti∶Sapphire laser to pump light and the amplification to seed light all with crystallographic axis towards there being much relations.If the polarization direction of pump light is not parallel to the crystalline axis direction of titanium gem crystal, the absorption efficiency of Ti∶Sapphire laser to pump light can be affected.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 Ti∶Sapphire laser to seed light, and the spectral modulation of seed light can be brought due to the birefringence efficiency of Ti∶Sapphire laser.The spectrum of seed light directly affects the compression of laser pulse, therefore can have influence on the compressibility of pulse with the seed light of spectrum adjusting.Therefore, in high energy PW laser system, require that pump light is consistent with the polarization direction of seed light and be strictly parallel to the crystalline axis direction of titanium gem crystal.
At present, determine that titanium gem crystal crystallographic axis comprises towards main method:
(1) adopt the pumping source of high repetition frequency, test Ti∶Sapphire laser is to the absorption of pump light.The laser sent by pumping source is incident to titanium gem crystal surface, after titanium gem crystal, measure remaining pump energy with energy meter.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) adopting very accurate grating spectrograph, when observing the modulation laser spectroscopy by Ti∶Sapphire laser having regularity, starting to rotate titanium gem crystal, until stop operating when modulation disappears, fix titanium gem crystal.But the method needs laser Multiple through then out, and titanium gem crystal just obvious modulation phenomenon can occur, and need very accurate grating spectrograph, therefore the method complex steps, and very high to requirement on devices.
Summary of the invention
The object of the invention is to overcome and above-mentionedly existingly determine the shortcoming of titanium gem crystal crystallographic axis towards method; There is provided a kind of determine titanium gem crystal crystallographic axis towards method, the method is simple to operate, scientific and effective, precision are high and practical.
Technical solution of the present invention is as follows:
Determine titanium gem crystal crystallographic axis towards a method, the device adopted comprises 800nm laser seed source, aperture, titanium gem crystal undetermined, titanium gem crystal frame and Rochon prism, and its feature is that the method comprises the following steps:
1. in the laser optical path of described 800nm laser seed source generation, place described aperture, the polarization state direction in described 800nm laser seed source is known;
2. Rochon prism is placed in the laser optical path after described aperture, make described laser beam by the center of described Rochon prism, Rochon prism described in rotation, 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, and make described laser beam by the center of described titanium gem crystal in the light path after described aperture;
4. described Rochon prism is placed in the laser optical path after described titanium gem crystal, make described laser beam by the center of described Rochon prism, titanium gem crystal described in rotation, 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; Then titanium gem crystal crystallographic axis towards the polarization direction being parallel to described 800nm laser seed source.
Principle of the present invention is:
Ti∶Sapphire laser is the nonlinear crystal of a single shaft.When the laser polarization state of incidence is not parallel to titanium gem crystal crystalline axis direction, will laser by time produce birefringence effect, thus 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 inconsistent time there will be obvious birefringence, the laser of outgoing can be divided into two bundle laser, and the direction of propagation is contrary.Because the precision of Rochon prism is very high, even if very little change appears in the laser polarization state of incidence, Rochon prism also can be easy to detect.Therefore, we can, first by the laser calibration Rochon prism of known polarization state, make the determined polarization state of Rochon prism consistent with inciding the laser polarization state before Ti∶Sapphire laser.Then allow laser by titanium gem crystal, if laser polarization is not parallel to Ti∶Sapphire laser crystalline axis direction, then the polarization state of the laser of outgoing can change, and now can detect the change of polarization through Rochon prism.Then rotate titanium gem crystal, when the crystalline axis direction of Ti∶Sapphire laser is parallel to incident laser polarization, the laser spot through Rochon prism outgoing is unique, and the direction of propagation does not change.Now the crystallographic axis of Ti∶Sapphire laser is towards the polarization direction being parallel to incident laser.
With compared with first method, the present invention has following outstanding feature:
1, the method only needs a Rochon prism, very simply.
2, use the Rochon prism after calibration as detection means, precision is high, can reach 10
-5;
3, the method not only can determine the crystallographic axis of titanium gem crystal towards, can also ensure that the polarization state of incident laser is strictly parallel to the crystalline axis direction of titanium gem crystal, the effective amplification of titanium gem crystal to incident laser can be ensured, avoid spectral modulation.
4, the method is portable strong, is not only applicable to titanium gem crystal, and is applicable to other nonlinear crystal.
Accompanying drawing explanation
Fig. 1 be the present invention utilize Rochon prism to determine titanium gem crystal crystallographic axis towards simple and easy index path.
Embodiment
Please first consult Fig. 1, Fig. 1 be determination titanium gem crystal crystallographic axis of the present invention towards the index path of method, determination titanium gem crystal crystallographic axis of the present invention 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. in the laser optical path of described 800nm laser seed source 1 generation, place aperture 2, make laser beam center through described aperture 2, to carry out limit bundle to described laser beam;
2. Rochon prism 5 is placed in the laser optical path after described aperture 2, make described laser beam by the center of described Rochon prism 5, Rochon prism 5 described in rotation, 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. after described aperture 2, place titanium gem crystal 3, 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. described Rochon prism 5 is placed in the laser optical path after described titanium gem crystal 3, make described laser beam by the center of described Rochon prism 5, titanium gem crystal 3 described in rotation, 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; Then titanium gem crystal crystallographic axis towards the polarization direction being parallel to described 800nm laser seed source.
Claims (1)
1. one kind determine 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), to carry out limit bundle to described laser, the polarization state direction in described 800nm laser seed source (1) is known;
2. Rochon prism (5) is placed in the laser optical path after described aperture (2), make described laser beam by the center of described Rochon prism (5), Rochon prism (5) described in rotation, 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. the titanium gem crystal (3) be arranged on described titanium gem crystal frame (4) is placed in the light path after described aperture (2), and makes described laser beam by the center of described titanium gem crystal (3);
4. described Rochon prism (5) is placed in the laser optical path after described titanium gem crystal (3), make described laser beam by the center of described Rochon prism (5), titanium gem crystal (3) described in rotation, 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); Then titanium gem crystal crystallographic axis towards the polarization direction being parallel to described 800nm laser seed source (1).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| 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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