CN104251673B - Crystal prism formula beam divergence angle inductor - Google Patents
Crystal prism formula beam divergence angle inductor Download PDFInfo
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- CN104251673B CN104251673B CN201310279887.8A CN201310279887A CN104251673B CN 104251673 B CN104251673 B CN 104251673B CN 201310279887 A CN201310279887 A CN 201310279887A CN 104251673 B CN104251673 B CN 104251673B
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Abstract
The present invention relates to a kind of calcite crystal lens type beam divergence angle inductor, belongs to beam divergence angle measuring device, meets the angle of divergence detection of heavy caliber light beam or small divergence light beam, it includes right-angle prism structure and prism arrangement mode.The optical axis of the right-angle prism 1,3,4 is perpendicular to rectangular edge, it is parallel with incident end face, the vertical rectangular edge of optical axis of right-angle prism 2, it is vertical with outgoing end face, the structure angle α of right-angle prism 1,2 takes 35 °~40 ° value ranges, and the structure angle β of right-angle prism 3,4 takes 38.5 °~39 ° value ranges；Right-angle prism 1,2 optical veneerings form the analyzing interference system of intermediate air gap, adjust the two systems into optimal delustring state into divided beam system, right-angle prism 3,4, and the relative bearing fixed between them is unidirectional using effective.Invention is to device end surface shape no standard, device applicable wavelengths scope 300nm~3500nm, is adapted to measurement angle scope 10 " to 3 °, extinction ratio >=1 × 10‑5, optic damage threshold value 10W/cm2。
Description
Technical field：
The present invention relates to a kind of beam divergence Characteristics Detection device, more particularly to a kind of beam divergence angle of calcite crystal
Convert measurement device.
Background technology：
Beam divergence angle is a very important technology parameter in optical system, and it decides that light energy has much journeys
Degree reaches sets target.In order to effectively play laser activity, increase operating distance, it is necessary to accordingly control the angle of divergence of laser beam,
This relates to the coherent detection problem of the angle of divergence.Angle of divergence detection generally use focal spot method, diaphragm method, pin hole scanning method, threshold
It is worth intensity method, focal plane CCD methods etc., general principle is completed indirectly by the measurement to spot size, and the boundary of spot profile is known
Other method is to influence a key factor of measuring accuracy；Polarization interference method, bbo crystal frequency multiplication method, wedge can also be used to cut
The methods such as interferometric method, the optical grating Moire fringe measurement angle of divergence is cut, basic ideas are to join the angle of divergence of light beam first with certain means
Amount is converted into the parameter of another more convenient detection, avoids depending on equipment precision and experiment condition unduly, but at present can enter
The ideal component of this conversion of row is deficient.
The content of the invention：
The present invention is a kind of beam divergence angle conversion devices based on conoscopic interference principle, and it make use of cross-polarized light state
Lower Iceland spar uniaxial crystal extinction performance is sensitive to incident angle of light and Iceland spar polarizer High Extinction Ratio principle designs.It
The divergence angle measurement under heavy caliber light beam can not only be met, need to only intercept the part corrugated in light beam can just work, Er Qieneng
Enough that the different magnitude of angle of divergence is detected by the interference of transmitted light, angle sensing range is big, and low-angle is sensitive, and it can
General measure means are coordinated to be rapidly completed the measurement of beam divergence angle.
Technical scheme is as follows：The present invention is made using single shaft Iceland spar, it is characterized in that：Device is by four ice cube continents
Stone crystal right-angle prism is formed, as illustrated, being represented respectively by symbol 1,2,3,4, the optical axis direction of crystal is represented with double-head arrow.
The wherein optical axis direction of right-angle prism 1 is and parallel with incident end face perpendicular to rectangular edge；The optical axis direction of right-angle prism 2 hangs down
Straight rectangular edge, and it is vertical with outgoing end face, the structure angle α (inclined-plane and thang-kng end face angle) of right-angle prism 1 and prism 2 takes
It is worth between 35 °~40 °；The optical axis direction of right-angle prism 3 and right-angle prism 4 is respectively perpendicular to respective rectangular edge, and with leading to
Light end face is parallel, and the structure angle β spans of right-angle prism 3 and right-angle prism 4 are 38.5 °~39 °.Light beam normal incidence right-angled edge
Mirror 1, the light entered after right-angle prism 1 are divided into two-beam, but this two-beam and not separated, and simply spread speed has difference.
When this two-beam enters right-angle prism 2, it will deviate from former direction wherein a branch of and laterally export, and another Shu Fangxiang does not change,
The structure of right-angle prism 1,2,3,4 and combination limit lateral light can not be by whole system, and allows and direction does not occur change
The another light beam become passes through.For directional light, now system is in delustring state, no optical information output.It is if now incident
Light beam has the angle of divergence, and being broken down into direction of vibration without that Shu Guanghui that direction change occurs by right-angle prism 2 is mutually perpendicular to
Two parts, they will produce interference after being combined by right-angle prism 3,4, and interference is related to the incident light angle of divergence.If
Incident light dispersion angle is big, and round bar line occurs in interference field, and angle information, angle and fringe number can be obtained from striped quantity
Into square root relationship；If incident light dispersion angle is small (or black light), interference fringe will disappear, but become from transmitted intensity
The difference of the angle of divergence can be reflected by changing, and related angle information, right-angle prism are may determine that or detect by measuring extinction condition
1st, 2 structure angles can influence accuracy of detection, and right-angle prism 1 is the incidence end of light, and right-angle prism 4 is exit end, unidirectional to use.
Adjustment right-angle prism 1 and the optical axis of right-angle prism 2 are fixed after being mutually perpendicular to optical cement, form a beam splitting system
System；Right-angle prism 3 and right-angle prism 4 are fixed according to the optical axis mode that is parallel to each other using intermediate air gap means, form one
Analyzing interference system.Arrangement mode as illustrated, divided beam system is adjusted first with analyzing interference system in nearly directional light incidence feelings
Into optimal delustring state under condition, relative bearing composition total system between the two is then fixed.Invention does not have to device end surface shape
There is a regulation, the applicable wave-length coverage of device be 300nm~3500nm, suitable angular surveying scope 10 " to 3 °, during directional light incidence
Extinction ratio be better than 1 × 10-5, optic damage threshold value 10W/cm2(continuous).
Brief description of the drawings：
Figure is the structural representation of the present invention.
Label declaration：1 right-angle prism, 2 right-angle prisms, 3 right-angle prisms, 4 right-angle prisms, α structure angles, beta structure angle.
Embodiment：
As shown in figure, the calcite crystal of optical grade of no inclusion enclave without furuncle knurl is selected, oriented cutting and grinding polishing, is divided
Do not square up prism 1, right-angle prism 2, right-angle prism 3, right-angle prism 4, the optical axis and angular error of each prism are controlled 1 '
Interior, wherein the structure angle of right-angle prism 1 and right-angle prism 2 is set as 38 °, and the structure angle of right-angle prism 3 and right-angle prism 4 is
39°.Right-angle prism 1 and right-angle prism 2 compose beam splitting system using resinene, adjust after glued and put down between its front and rear light pass surface
Row degree, BEAM SQUINT angle is set to be less than 3 '；Right-angle prism 3 forms analyzing interference with right-angle prism 4 using air-gap gluing technique
System, air-gap thickness control need keeping parallelism in 20um or so, the main cross section of two prisms, the depth of parallelism between light pass surface before and after adjustment
BEAM SQUINT angle is set to be less than 3 '.This beam splitting system and analyzing interference system are placed in a coaxial optical path, as illustrated rib
Mutual alignment is arranged in mirror inclined-plane orientation, and right-angle prism 1 is the incidence end of light, and rotation adjustment analyzing interference system causes the light intensity passed through
It is then both fixed to form integral devices for optimal delustring state.Right-angle prism end face its favourable performance of plating antireflective film improves.
This product main application：Applied to the visible divergence angle measurement to near-infrared light beam, especially to high-aperture beam or
The detection of small divergence angle light beam is more convenient.Not only changed by intuitively observing light intensity, can be rapid qualitative the tested light beam matter of judgement
The quality of amount, and it is aided with lens or extinction performance measuring method, the quality for detecting beam quality can be quantified.
Claims (1)
1. a kind of crystal prism formula beam divergence angle inductor, it includes prism structure and prism arrangement mode, it is characterised in that：
Whole device is made up of four Iceland spar right-angle prisms, the first right-angle prism (1), the 3rd right-angle prism (3), the 4th right-angle prism
(4) rectangular edge of the optical axis below prism, it is parallel with incident end face, the optical axis of the second right-angle prism (2) perpendicular to
Rectangular edge on the left of prism, first right-angle prism (1), the structure angle value of second right-angle prism (2) vertical with outgoing end face
35 °~40 ° of scope, the 3rd right-angle prism (3), 38.5 °~39 ° of the structure angle span of the 4th right-angle prism (4)；First is straight
Angle prism (1), the second right-angle prism (2) use neutral optical resin glue glued adhesion, the 3rd right-angle prism (3), the 4th right-angle prism
(4) glued using air-gap mode, the first right-angle prism (1) bevel direction is relative with the 3rd right-angle prism (3) bevel direction to be put
Put；First right-angle prism (1), the second right-angle prism (2), the 3rd right-angle prism (3), the 4th right-angle prism (4) are adjusted to most
It is integrally fixed after good delustring state, extinction ratio during directional light incidence is better than 1 × 10-5, the first right-angle prism (1) enters for light beam
End is penetrated, the applicable wave-length coverage of device is 300nm~3500nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310279887.8A CN104251673B (en) | 2013-06-28 | 2013-06-28 | Crystal prism formula beam divergence angle inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310279887.8A CN104251673B (en) | 2013-06-28 | 2013-06-28 | Crystal prism formula beam divergence angle inductor |
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| Publication Number | Publication Date |
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| CN104251673A CN104251673A (en) | 2014-12-31 |
| CN104251673B true CN104251673B (en) | 2018-02-02 |
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| CN201310279887.8A Expired - Fee Related CN104251673B (en) | 2013-06-28 | 2013-06-28 | Crystal prism formula beam divergence angle inductor |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950637A (en) * | 2017-05-08 | 2017-07-14 | 曲阜师范大学 | A kind of double Wollaston symmetric splitting prisms of the class of Iceland spar and glass combination |
| CN107085311A (en) * | 2017-06-06 | 2017-08-22 | 曲阜师范大学 | One kind turns to symmetric splitting ahrens prism |
| CN109425575A (en) * | 2017-09-04 | 2019-03-05 | 南京麒麟科学仪器集团有限公司 | A kind of polarimeter |
| CN110530297B (en) * | 2018-05-23 | 2020-11-03 | 中国科学院长春光学精密机械与物理研究所 | Method for judging laser beam collimation and shearing interferometer adopting same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5164822B2 (en) * | 2007-12-21 | 2013-03-21 | エーエスエムエル ホールディング エヌ．ブイ． | Beam characteristic monitor for detecting the characteristics of light beams |
| CN201489132U (en) * | 2009-06-24 | 2010-05-26 | 福州高意通讯有限公司 | crystal polarizer |
| CN102200597B (en) * | 2010-03-23 | 2012-11-14 | 宋连科 | Air gap type BBO (Barium Boron Oxide) laser polarizing prism |
-
2013
- 2013-06-28 CN CN201310279887.8A patent/CN104251673B/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
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| 洛匈棱镜反向应用特性研究;吴福全等;《光电子激光》;20021031;第13卷(第10期);正文第1-4节及图1-6 * |
| 洛匈棱镜的正反向特性;陈西园等;《光学技术》;20060331;第32卷(第2期);全文 * |
| 空气隙型格兰泰勒棱镜斜面减反射膜的设计;郝殿中等;《曲阜师范大学学报》;20091031;第35卷(第4期);正文第59页 * |
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