CN105372798B - Big energy reflecting light attenuator - Google Patents
Big energy reflecting light attenuator Download PDFInfo
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- CN105372798B CN105372798B CN201510898112.8A CN201510898112A CN105372798B CN 105372798 B CN105372798 B CN 105372798B CN 201510898112 A CN201510898112 A CN 201510898112A CN 105372798 B CN105372798 B CN 105372798B
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- wedge
- dustbin
- big energy
- reflection mirror
- pulse
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0668—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror having non-imaging properties
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
A kind of big energy reflecting light attenuator, is mainly made up of high reflective mirror, wedge, white tiles, translation stage, extender lens, dustbin.The present invention, which has, to be made simply, the characteristics of easy to operate, the incident laser pulse of the big energy repetition rate for the tens of joules of magnitudes that can effectively decay, the attenuation coefficient difference of the pulse of different wave length is little, attenuation process will not introduce material dispersion, wavefront distortion will not be introduced to pulse, the influence compressed and focused on to succeeding impulse can be reduced.
Description
Technical field
The invention belongs to optical attenuation, more particularly to a kind of big energy reflecting light attenuator.
Background technology
Optical attenuator is a kind of important optics, it can according to the demand of user by the energy of optical signal according to pre-
Phase is decayed, and is frequently utilized for absorbing, is reflected or transmitted optical power surplus, so as to carry out the assessment of intensity laser system,
Research, adjustment and correction etc..Recently as the rapid development of laser technology, numerous laboratories are developed or carried in succession in the world
The big energy ultra-short intense laser system of various repetition rates is gone out, where such as the Apollo 10PW systems in Europe, Shanghai ray machine
The PW systems built, 200TW systems of Shanghai Communications University etc., big system brings many problems while appearance, such as how to survey
Measure pulse width, focal beam spot of such big energy ultra-short intense laser system etc., the general pulsewidth of laser pulse of such system
It is narrower, energy is larger, to attenuator introduce wavefront distortion it is more sensitive the features such as, attenuator face type quality can influence hot spot
Focus on, the material dispersion of attenuator can influence the compression of pulse width, therefore how to design and a set of support big energy-incident
Pulse, small wavefront distortion introduce, the optical attenuator of not additional materials dispersion measures as big energy ultra-intense laser systematic parameter
Key.
Optical attenuator in patent 101441332A (precision laser attenuator), it is by be arranged in same optical axis two
Faraday polarization apparatus composition between parallel polarizer and the two polarizers, it can continuous high-precision control laser energy
The decay of amount.But the introducing of the system Faraday polarization apparatus, suitable material dispersion can be added to incident pulse, this will cause
Superpower ultrashort pulse can not be compressed after being attenuated, and in addition for the laser pulse of big energy, this system needs larger caliber
Polarization apparatus, it is expensive.
The linear polarizer composition that the companies such as Amplitude are placed in parallel with a half-wave retardation piece and two is tunable
Attenuator, decay incident light that can also be relatively accurate, but general incident pulse extinction ratio is limited, the light of two kinds of different polarizations
After the attenuator, easily cause the modulation of pulse, influence the measurement of follow-up pulsewidth, this attenuator is used for big energy of decaying in addition
, it is necessary to be water-cooled half-wave plate when measuring laser pulse, portability is extremely restricted.Its wave plate used is mostly for spy in addition
Standing wave length, there is significant selectivity to wavelength, even if using achromatic half-wave plate, and for specific thang-kng ripple
Section.
The neutral density attenuator that the companies such as Thorlabs provide, it is optically thin by being plated in glass or quartz surfaces
Film is decayed to incident light, and this kind of attenuator is simply to use portable, but its threshold value, than relatively low, general magnitude is 10mJ/
Cm^2, high power laser pulse are easy to puncture its film layer.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of big energy reflecting light attenuator, the light decay
Subtract device can effectively decay tens of joules of magnitudes big energy repetition rate incident laser pulse, for the wavelength of incident light
Selectivity is weaker, and the pulse of different wave length is little by the optical attenuator attenuation differences, will not additionally draw in attenuation process in addition
Enter material dispersion, wavefront distortion will not be introduced to pulse.
The technical solution adopted in the present invention is：
A kind of big energy reflecting light attenuator, feature be its composition include the first high reflection mirror, translation stage, wedge,
First dustbin, white tiles, the second dustbin and the second high reflection mirror, the first described high reflection mirror, wedge, the first dustbin,
White tiles, the second dustbin and the second high reflection mirror are placed on described translation stage；The face shape in the front-reflection face of described wedge
PV<λ/10, RMS<λ/50, the back reflection face of wedge is common burnishing surface, and the angle of wedge of wedge is more than 0.1 radian；Described white tiles
Front-reflection face face shape PV<λ/10, RMS<λ/50, another side feather plucking；
It is the first high reflection mirror, wedge, white tiles and the second high reflection mirror successively along input path direction, in described wedge
It is the first described dustbin to transmit light direction, and the reflection light direction on the rear surface of described wedge is the second described rubbish
Bucket.
Extender lens is placed between described wedge and the first dustbin.
Compared with prior art, beneficial effects of the present invention are as follows：
The main attenuation units of big energy reflecting light attenuator of the invention are white tiles and wedge, and 10cm magnitudes is white at present
Piece and wedge manufacture craft comparative maturity, can be used in big system, intensity laser pulse are decayed, in addition in vain
Piece and wedge are weaker to the wavelength selectivity of incident pulse, and attenuating of the laser pulse through the attenuator of different-waveband is poor
Different less on the other hand to pulse using reflection mode decay, the dispersion of introducing can ignore the attenuator, due to all anti-
The face type for penetrating face is all controlled within 1/10th wavelength, so the wavefront distortion that the attenuator introduces can be ignored.
In a word, the incident laser pulse of the big energy repetition rate of the tens of joules of magnitudes of the invention that can effectively decay,
The attenuation coefficient difference of the pulse of different wave length is little, and attenuation process will not introduce material dispersion, will not introduce wavefront to pulse
Distortion, the influence compressed and focused on to succeeding impulse can be reduced.
Brief description of the drawings
Fig. 1 is the index path of the big energy reflecting light attenuator of the present invention；
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As seen from Figure 1, the big energy reflecting light attenuator of the present invention, composition include the first high reflection mirror 1, translation stage 2, wedge
Plate 3, the first dustbin 4, white tiles 5, the second dustbin 6 and the second high reflection mirror 7, the first described high reflection mirror 1, wedge 3,
One dustbin 4, white tiles 5, the second dustbin 6 and the second high reflection mirror 7 are placed on described translation stage 2, along input path direction
It is the first high reflection mirror 1, wedge 3, the high reflection mirror 7 of white tiles 5 and second successively, is institute in the transmission light direction of described wedge 3
The first dustbin 5 stated, the reflection light direction on the rear surface of described wedge 3 are the second described dustbins 6.Here is one
The major parameter of individual embodiment：
The PV of the face shape in the front-reflection face of described wedge<λ/10, RMS<λ/50, the back reflection face of wedge is common polishing
Face, the angle of wedge of wedge are more than 0.1 radian.
The PV of the face shape in the front-reflection face of described white tiles<λ/10, RMS<λ/50, another side feather plucking.
The laser parameter of the present embodiment is as follows：
Incident light is 8J, diameter 32mm, full width at half maximum bandwidth 70nm, pulsewidth 1.4ns, centre wavelength 800nm, repeatedly frequency
Rate is 5Hz laser pulse.When just commonly using its target practice, compressed after incident pulse is expanded, but working as needs to measure its arteries and veins
, it is necessary to will could be measured after energy attenuation to 10mJ magnitudes during the indexs such as width, wavefront, spectrum.
As shown in figure 1, when attenuator works onto, translation stage 2 is shifted to the position of lower section mark.The incident light of collimation passes through
Main optical path is imported into again after attenuator decay.Through the attenuator decay after laser pulse and decay before, wavefront with
And spectrum change can be ignored, by follow-up compressor compresses, the most narrow spaces of the compression of support are 27fs or so, about
For 1.1 to 1.2 times of Fourier transformation extreme pulse widths.
Claims (2)
1. a kind of big energy reflecting light attenuator, it is characterised by that its composition includes the first high reflection mirror (1), translation stage (2), wedge
Plate (3), the first dustbin (4), white tiles (5), the second dustbin (6) and the second high reflection mirror (7), the first described high reflection mirror
(1), wedge (3), the first dustbin (4), white tiles (5), the second dustbin (6) and the second high reflection mirror (7) are placed in described put down
In moving stage (2)；The PV of the face shape in the front-reflection face of described wedge (3)<λ/10, RMS<λ/50, described wedge (3) it is rear anti-
It is common burnishing surface to penetrate face, and the angle of wedge of wedge is more than 0.1 radian；The PV of the face shape in the front-reflection face of described white tiles (5)<λ/
10, RMS<λ/50, another side feather plucking；Along input path direction be successively the first high reflection mirror (1), wedge (3), white tiles (5) and
Second high reflection mirror (7), it is described the first dustbin (5) in the transmission light direction of described wedge (3), in described wedge
(3) the reflection light direction on rear surface is described the second dustbin (6).
2. big energy reflecting light attenuator according to claim 1, it is characterised in that in described wedge (3) and
One dustbin is placed with extender lens between (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510898112.8A CN105372798B (en) | 2015-12-08 | 2015-12-08 | Big energy reflecting light attenuator |
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| CN201510898112.8A CN105372798B (en) | 2015-12-08 | 2015-12-08 | Big energy reflecting light attenuator |
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| CN105372798A CN105372798A (en) | 2016-03-02 |
| CN105372798B true CN105372798B (en) | 2018-03-20 |
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Citations (8)
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|---|---|---|---|---|
| US6278547B1 (en) * | 1998-05-06 | 2001-08-21 | Hughes Electronics Corporation | Polarization insensitive faraday attenuator |
| CN2546913Y (en) * | 2001-10-30 | 2003-04-23 | 鸿富锦精密工业（深圳）有限公司 | Double-reflection optical attenuator |
| US7034979B1 (en) * | 2001-11-09 | 2006-04-25 | Ezconn Corporation | Variable optical attenuator using crystal wedges |
| CN201725110U (en) * | 2010-08-17 | 2011-01-26 | 中国工程物理研究院激光聚变研究中心 | High-power laser attenuator |
| CN102053392A (en) * | 2010-12-16 | 2011-05-11 | 福州高意光学有限公司 | High-power laser attenuator |
| CN102591007A (en) * | 2012-03-29 | 2012-07-18 | 中国科学院上海光学精密机械研究所 | Optical attenuator with invariable continuous adjustable optical path |
| CN104655408A (en) * | 2015-01-29 | 2015-05-27 | 大族激光科技产业集团股份有限公司 | Laser power monitoring device |
| CN105044704A (en) * | 2015-07-24 | 2015-11-11 | 北京空间机电研究所 | High precision spaceborne laser transmitter performance integrated test system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0219794D0 (en) * | 2002-08-23 | 2002-10-02 | Alcatel Optronics Uk Ltd | A variable optical attenuator |
-
2015
- 2015-12-08 CN CN201510898112.8A patent/CN105372798B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6278547B1 (en) * | 1998-05-06 | 2001-08-21 | Hughes Electronics Corporation | Polarization insensitive faraday attenuator |
| CN2546913Y (en) * | 2001-10-30 | 2003-04-23 | 鸿富锦精密工业（深圳）有限公司 | Double-reflection optical attenuator |
| US7034979B1 (en) * | 2001-11-09 | 2006-04-25 | Ezconn Corporation | Variable optical attenuator using crystal wedges |
| CN201725110U (en) * | 2010-08-17 | 2011-01-26 | 中国工程物理研究院激光聚变研究中心 | High-power laser attenuator |
| CN102053392A (en) * | 2010-12-16 | 2011-05-11 | 福州高意光学有限公司 | High-power laser attenuator |
| CN102591007A (en) * | 2012-03-29 | 2012-07-18 | 中国科学院上海光学精密机械研究所 | Optical attenuator with invariable continuous adjustable optical path |
| CN104655408A (en) * | 2015-01-29 | 2015-05-27 | 大族激光科技产业集团股份有限公司 | Laser power monitoring device |
| CN105044704A (en) * | 2015-07-24 | 2015-11-11 | 北京空间机电研究所 | High precision spaceborne laser transmitter performance integrated test system |
Non-Patent Citations (2)
| Title |
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| "光衰减器系列化研究及应用";刘秋华 等;《光通信研究》;19971231(第82期);第55-58页 * |
| "反射式可调激光衰减器的研究";薛战理 等;《应用光学》;20150531;第36卷(第3期);第469-474页 * |
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| CN105372798A (en) | 2016-03-02 |
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