CN203688076U - Interferometer in velocity interferometer system for any reflector - Google Patents
Interferometer in velocity interferometer system for any reflector Download PDFInfo
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- CN203688076U CN203688076U CN201320849741.8U CN201320849741U CN203688076U CN 203688076 U CN203688076 U CN 203688076U CN 201320849741 U CN201320849741 U CN 201320849741U CN 203688076 U CN203688076 U CN 203688076U
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- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims abstract description 59
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- 230000035939 shock Effects 0.000 claims description 26
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- 238000012360 testing method Methods 0.000 description 6
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- 238000007493 shaping process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
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- 238000009529 body temperature measurement Methods 0.000 description 1
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- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 description 1
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- 229910052627 muscovite Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Abstract
The utility model relates to an interferometer in a velocity interferometer system for any reflector (VISAR), comprising a geometric ratio beam splitter, a first reflector, a beam combiner, a second reflector and a first time delay etalon. Doppler frequency shift pilot light forms reflected light and transmitted light through the geometric ratio beam splitter; the first reflector and the beam combiner are successively arranged on the optical path of the reflected light; the first time delay etalon, the second reflector and the beam combiner are successively arranged on the optical path of the transmitted light; the transmitted light enters the beam combiner successively through the first time delay etalon, the second reflector and the first time delay etalon. The interferometer also comprises a second time delay etalon; the reflected light enters the beam combiner successively through the second time delay etalon, the first reflector and the second time delay etalon. The utility model provides a VISAR interferometer with controllable delay time.
Description
Technical field
The utility model belongs to optical field, relate to a kind of shock velocity measuring system, relate in particular to a kind of at inertial confinement fusion (Inertial Confinement Fusion, be abbreviated as ICF) interferometer in the shock velocity measuring system (Velocity Interferometer System for Any Refector, is abbreviated as VISAR) of research field.
Background technology
Inertial confinement fusion is the artificial controllable nuclear fusion of one generally adopting at present, it utilizes superlaser as drive source (directly or indirectly driving), tens restraint even hundreds of bundle superlaser compresses the fuel in pellet constantly according to certain sequential, make it the temperature and the pressure that reach high, until realize fusion reaction.Inertial confinement fusion all has very great Research Significance on civilian and military, and it will explore a kind of clean nuclear power source for the mankind, and achievement in research also can be used to development without the nuclear weapon of radiocontamination and development high energy laser weapon etc.Therefore, this research field has been subject to the great attention of each nuclear power of the world, has set up a series of laser driving apparatus.
At present main laser driving apparatus has in the world: the Nova(10 bundle laser of the U.S.), Beamlet(1 restraints laser), Omega(60 restraints laser), NIF(192 restraints laser) etc.; Muscovite Iskra-6(128 bundle laser) etc.; The Gekko XII (12 bundle laser) of Japan etc.; The Phebus(2 bundle laser of France), LMJ(240 restraints laser) etc.; God Light-the II (8 bundle laser) of China, Shenguang-Ⅲ prototype (8 bundle laser), Shenguang-Ⅲ main frame (48 bundle laser) etc.; The Vulcan(8 bundle laser of Britain) etc.
Along with deepening continuously of ICF research, it is found that the very harshness of condition that realizes high-gain fusion, thereby be forced to the increasing laser driving apparatus of the scale of setting up, constantly promote driving force.Correlative study shows, if can carry out isentropic compression to fuel, realizes the required driving-energy minimum of fusion; If can not realize isentropic compression, realizing the required driving-energy of fusion can significantly promote.In order to realize isentropic compression, driving laser is divided into four groups chronologically, form the increasing driving-energy of a succession of intensity fuel substep is carried out to preheating, pre-ignition, precompression, compression, whole process continued to only have tens nanoseconds (10
-9s).Within the time period of this microcosmic, hundreds of Shu Jiguang must accurately arrive pellet according to predetermined sequential, once entanglement appears in their sequential, will cause practicing shooting unsuccessfully.Therefore, put into operation the initial stage at laser driver, it is extremely important, a requisite debugging job that the sequential of laser pulse is carried out to shaping.
Along with the foundation of domestic large laser drive unit, fuel is similar to isentropic compression and realizes fusion and become possibility, be badly in need of driving pulse to carry out shaping.Xian Inst. of Optics and Precision Mechanics, Chinese Academy of Sciences has developed two covers " imaging-type shock velocity interferometer measuration system " (VISAR) in 2008 and 2010, be respectively used to SG-Ⅲ prototype and Shenguang-Ⅲ host apparatus.Initiation time, convergence time, impact wave propagation velocity etc. that this equipment can arrive the shock wave that target spot produces to driving pulse measure, and effect that can check pulse shaping according to measurement result, instructs pulse optimization shaping.In addition, this equipment also can be used for the tests such as " extreme state of matter equation research ", " material behavior research under shock wave ", " shock wave radiometric temperature measurement ", has become one of most important testing apparatus in laser fusion target range.
The theoretical foundation of shock velocity measuring system (VISAR) is the doppler shift effect of light, and two different signal mixing of frequency will produce Beat Signal.In the time measuring Doppler shift amount, be not directly to measure light frequency, because light frequency is too high, recording unit cannot respond so high frequency.Velocity measuring system record be the frequency of two Beat Signals that Doppler shift optical mixing does not in the same time produce.In the time that sample velocities changes especially soon, the frequency of Beat Signal also may exceed the Hz-KHz of detection system, but can, by reducing time delay, reduce two difference between Doppler shift light in theory, thereby the frequency that reduces Beat Signal, makes it not exceed Hz-KHz.In theory, velocity measuring system does not have the high speed upper limit.
But, in Practical Project, time delay by placing an etalon Etalon(optical parallel in light path) realize, because light is longer by the required time of the air of same thickness than it by the crystal of same thickness, with respect to the light path that does not have etalon to postpone, it is poor that two light paths have the regular hour.When time delay very in short-term, it is very thin that the thickness of etalon will become.And interferometer measuration system is very high to two of etalon surperficial surface figure accuracies requirements, if its very thin thickness, its surface is easy to occur deformation, in engineering, cannot make very thin thickness and the very high etalon of surface figure accuracy.
Utility model content
In order to solve the technical matters of the upper limit that tests the speed of the shock velocity measuring system (VISAR) existing in background technology, the utility model provides the interferometer in the shock velocity measuring system that can control a kind of time delay.
Technical solution of the present utility model is: the utility model provides the interferometer in a kind of shock velocity measuring system, comprises that geometric beam-splitting mirror, the first catoptron, light combination mirror, the second catoptron and the very first time postpone etalon; Doppler shifted signal light forms reflected light and transmitted light after geometric beam-splitting mirror; Described the first catoptron and light combination mirror are successively set in the light path at reflected light place; The described very first time postpones etalon, the second catoptron and light combination mirror and is successively set in the light path at transmitted light place; Described transmitted light postpones etalon, the second catoptron and very first time delay etalon through the very first time successively and is incident to light combination mirror; Its special character is: the interferometer in described shock velocity measuring system also comprises the second time delay etalon; Described reflected light is incident to light combination mirror through the second time delay etalon, the first catoptron and the second time delay etalon successively.
The thickness that the above-mentioned very first time postpones etalon and the second time delay etalon is different.
The above-mentioned very first time postpones etalon and the second time delay etalon is all optical parallels.
The utility model has the advantages that:
The utility model provides the interferometer in a kind of shock velocity measuring system, it by placing respectively an etalon in two light paths that participate in mixing, the thickness of every etalon is not etc., its difference can experimentally need to arrange and control, and can accomplish very little (even nanoscale of micron), thereby it is very little that can control to the time delay that participates in the two-way light of mixing, solve the problem of the upper limit that tests the speed of shock velocity measuring system (VISAR).The utility model can easily arrange the time delay of difference frequency signal by adjusting the thickness difference of two etalons, mean that the thickness difference of two etalons can do very littlely, and can reach very little magnitude the time delay of two light paths.If operation wavelength is 532nm, the thickness difference of two etalons is 1 micron, and etalon adopts fused silica glass to make, and is about 5.17 × 10 time delay
-15second, this cannot realize by the thickness realization little time delay like this that reduces etalon in system in the past.
Accompanying drawing explanation
Fig. 1 is the interferometer component structural representation in shock velocity measuring system in prior art;
Fig. 2 is the structural representation that contains the delay interferometer of single etalon in prior art;
Fig. 3 is the structural representation of the interferometer in shock velocity measuring system provided by the utility model;
Wherein:
1-geometric beam-splitting mirror; 2-the first catoptron; 3-light combination mirror; 4-the second catoptron; The 5-very first time postpones etalon; 6-the second time delay etalon.
Embodiment
Shock velocity measuring system is the optical measuring system of a set of very accurate, complicated structure, and the structure of its interferometer component as shown in Figure 1.After doppler shifted signal light enters interferometer, first by geometric beam-splitting mirror BS1(geometric beam-splitting mirror 1) be divided into two bundles: reflecting part is through mirror M 1(the first catoptron 2) arrival light combination mirror BS2(light combination mirror 3 after reflection); Transmissive portion is through mirror M 2(the second catoptron 4) arrival light combination mirror BS2(light combination mirror 3 after reflection).Through BS2(light combination mirror 3) afterwards, two-beam overlaps and conllinear again.In Fig. 1, not free delay the between two-beam, can not produce Beat Signal.
If the joining day in one of them light path of interferometer is postponed to etalon (very first time postpones etalon 5), and (thickness is h), and by the catoptron of a corresponding light path mobile segment distance △ Z backward, make in the situation that having etalon refraction, two light paths are at process BS2(light combination mirror 3) can again strictly overlap afterwards and conllinear, as shown in Figure 2.Postponing because two light paths have the regular hour, is time dependent if impact wave propagation velocity, and Doppler signal light is interfered through producing difference frequency after interferometer, occurs Beat Signal.
In order to improve the upper limit that tests the speed of shock velocity measuring system, must reduce the time delay between two light paths, this case has proposed the interferometer in shock velocity measuring system as shown in Figure 3 for this reason, comprises that geometric beam-splitting mirror 1, the first catoptron 2, light combination mirror 3, the second catoptron 4 and the very first time postpone etalon 5; Doppler shifted signal light forms reflected light and transmitted light after geometric beam-splitting mirror 1; The first catoptron 2 and light combination mirror 3 are successively set in the light path at reflected light place; The very first time postpones etalon 5, the second catoptron 4 and light combination mirror 3 and is successively set in the light path at transmitted light place; Transmitted light postpones etalon 5, the second catoptron 4 and very first time delay etalon 5 through the very first time successively and is incident to light combination mirror 3; Interferometer in shock velocity measuring system also comprises the second time delay etalon 6; Reflected light is incident to light combination mirror 3 through the second time delay etalon 6, the first catoptron 2 and the second time delay etalon 6 successively.
The thickness that the very first time postpones etalon 5 and the second time delay etalon 6 is different.
The utility model is placed respectively the etalon that thickness is h1 and h2 in two light paths of interferometer, and not etc., its difference can experimentally not need to arrange the two thickness.Like this, can be easily set the time delay of difference frequency signal by adjusting the thickness difference of two etalons, and current technical merit is very high (even nanoscale of micron) to the measuring accuracy of thickness, the thickness difference that this means two etalons can do very littlely, and can reach very little magnitude the time delay of two light paths.If operation wavelength is 532nm, the thickness difference of two etalons is 1 micron, and etalon adopts fused silica glass to make, and is about 5.17 × 10 time delay
-15second, this cannot realize by the thickness realization little time delay like this that reduces etalon in system in the past.
The utility model the interferometer in a kind of shock velocity measuring system is provided, it by placing respectively an etalon in two light paths that participate in mixing, the thickness of every etalon can be thicker, but the thickness difference of two etalons can be controlled, and can accomplish very little (even nanoscale of micron), thereby it is very little that can control to the time delay that participates in the two-way light of mixing, solve the problem of the upper limit that tests the speed of shock velocity measuring system (VISAR).
Claims (3)
1. the interferometer in shock velocity measuring system, comprises that geometric beam-splitting mirror, the first catoptron, light combination mirror, the second catoptron and the very first time postpone etalon; Doppler shifted signal light forms reflected light and transmitted light after geometric beam-splitting mirror; Described the first catoptron and light combination mirror are successively set in the light path at reflected light place; The described very first time postpones etalon, the second catoptron and light combination mirror and is successively set in the light path at transmitted light place; Described transmitted light postpones etalon, the second catoptron and very first time delay etalon through the very first time successively and is incident to light combination mirror; It is characterized in that: the interferometer in described shock velocity measuring system also comprises the second time delay etalon; Described reflected light is incident to light combination mirror through the second time delay etalon, the first catoptron and the second time delay etalon successively.
2. the interferometer in shock velocity measuring system according to claim 1, is characterized in that: the thickness that the described very first time postpones etalon and the second time delay etalon is different.
3. the interferometer in shock velocity measuring system according to claim 1 and 2, is characterized in that: the described very first time postpones etalon and the second time delay etalon is all optical parallels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320849741.8U CN203688076U (en) | 2013-12-19 | 2013-12-19 | Interferometer in velocity interferometer system for any reflector |
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| CN201320849741.8U CN203688076U (en) | 2013-12-19 | 2013-12-19 | Interferometer in velocity interferometer system for any reflector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712698A (en) * | 2013-12-19 | 2014-04-09 | 中国科学院西安光学精密机械研究所 | Interferometer in shock wave velocity measurement system |
| CN109341839A (en) * | 2018-10-31 | 2019-02-15 | 西南交通大学 | Equipment, detection method and the application of shock velocity in a kind of test sample |
-
2013
- 2013-12-19 CN CN201320849741.8U patent/CN203688076U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712698A (en) * | 2013-12-19 | 2014-04-09 | 中国科学院西安光学精密机械研究所 | Interferometer in shock wave velocity measurement system |
| CN109341839A (en) * | 2018-10-31 | 2019-02-15 | 西南交通大学 | Equipment, detection method and the application of shock velocity in a kind of test sample |
| CN109341839B (en) * | 2018-10-31 | 2019-12-27 | 西南交通大学 | Device for detecting shock wave velocity in sample, detection method and application |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |