JPH05181013A - Polarized light conversion device - Google Patents
Polarized light conversion deviceInfo
- Publication number
- JPH05181013A JPH05181013A JP35848791A JP35848791A JPH05181013A JP H05181013 A JPH05181013 A JP H05181013A JP 35848791 A JP35848791 A JP 35848791A JP 35848791 A JP35848791 A JP 35848791A JP H05181013 A JPH05181013 A JP H05181013A
- Authority
- JP
- Japan
- Prior art keywords
- polarized light
- refractive index
- substrate
- light
- circularly polarized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Polarising Elements (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】偏光を使う各種の測定で直線偏光
を円偏光に変換したい場合がある。またレーザ出射光は
偏光になっていて測定上不都合な場合もあり、これを円
偏光にしたい場合がある。本発明はこのような場合に用
いられる偏光円偏光変換装置に関する。[Industrial application] There are cases where it is desired to convert linearly polarized light into circularly polarized light in various measurements using polarized light. In addition, the laser emission light is polarized, which may be inconvenient in measurement, and it may be desired to make it circularly polarized. The present invention relates to a polarization circular polarization conversion device used in such a case.
【0002】[0002]
【従来の技術】上述したような場合、従来は水晶製透過
型1/4波長板を用いてもとの偏光を円偏光に変換して
いる。しかし水晶製透過型1/4波長板は高価なもので
あるから、このような偏光変換装置も高価なものであっ
た。2. Description of the Related Art In the above-described case, conventionally, a transmission type quarter-wave plate made of quartz is used to convert original polarized light into circularly polarized light. However, since the crystal transmission type quarter-wave plate is expensive, such a polarization conversion device is also expensive.
【0003】[0003]
【発明が解決しようとする課題】本発明は高価な水晶製
透過型1/4波長板を用いないで直線偏光を円偏光に変
換する手段を提供しようとするものである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a means for converting linearly polarized light into circularly polarized light without using an expensive transmission type quarter wave plate made of quartz.
【0004】[0004]
【課題を解決するための手段】鏡面基板上に基板に対し
て適当な屈折率を有する物質の適当厚さの層を形成した
反射面に直線偏光を斜め入射させるようにした。A linearly polarized light is obliquely incident on a reflecting surface formed by forming a layer of a material having an appropriate refractive index on the mirror-like substrate and having an appropriate refractive index with respect to the substrate.
【0005】[0005]
【作用】基板面に薄層を形成し、基板に光を入射させる
と、薄層の表面と薄層と基板との境界面からの反射光が
相互干渉することにより、基板面に入射させた直線偏光
は一般に楕円偏光となる。そこで特定の波長の光を特定
の入射角で基板面に入射させると反射光は円偏光とな
り、目的が達成される。When a thin layer is formed on the surface of the substrate and light is incident on the substrate, the light reflected from the surface of the thin layer and the reflected light from the boundary surface between the thin layer and the substrate interfere with each other, so that the light is incident on the substrate surface. Linearly polarized light is generally elliptically polarized light. Therefore, when light of a specific wavelength is incident on the surface of the substrate at a specific incident angle, the reflected light becomes circularly polarized light, and the purpose is achieved.
【0006】[0006]
【実施例】図2に本発明の一実施例を示す。この実施例
はYAG(イットリウム・砒素・ガリウム)レーザより
出射される直線偏光を円偏光に変換する装置で、二つの
レーザから放射される二つのレーザビームを交互に円偏
光にして同一光路上に乗せるようにした光学系である。
x軸上で1,2は夫々上記したレーザでx軸に沿ってレ
ーザビームを出射している。これらのレーザビームは鏡
面3,4によりxz平面(垂直面)内で斜め上方に反射
され、z軸で会合するようにしてある。この会合点に反
射板5,6が交互に出入され、反射板5によってレーザ
1から出射した光がy軸方向に反射され、反射板5を反
射板6と交換するとレーザ2から出射した光がy軸方向
に反射されて、二つのレーザ1,2から出射した光が交
互に同一光路上に乗せられる。この光学系で、鏡3,4
は普通の鏡であり、5,6が直線偏光を円偏光に変換す
る機能を有する反射板である。FIG. 2 shows an embodiment of the present invention. This embodiment is a device for converting linearly polarized light emitted from a YAG (yttrium, arsenic, gallium) laser into circularly polarized light. Two laser beams emitted from two lasers are alternately circularly polarized and placed on the same optical path. It is an optical system that can be mounted.
On the x-axis, reference numerals 1 and 2 denote the above-mentioned lasers, respectively, which emit laser beams along the x-axis. These laser beams are reflected obliquely upward in the xz plane (vertical plane) by the mirror surfaces 3 and 4 so as to meet at the z axis. Reflecting plates 5 and 6 are alternately put in and out of this meeting point, the light emitted from the laser 1 is reflected in the y-axis direction by the reflecting plate 5, and when the reflecting plate 5 is replaced with the reflecting plate 6, the light emitted from the laser 2 is generated. Light emitted from the two lasers 1 and 2 reflected in the y-axis direction is alternately placed on the same optical path. With this optical system, mirrors 3, 4
Are ordinary mirrors, and 5 and 6 are reflectors having a function of converting linearly polarized light into circularly polarized light.
【0007】図1は図2に示した光学系の鏡3,5を経
てy軸方向に送られるレーザ1の出射光の光路を示す。
反射板5でレーザビームは45°の角度で入射し、45
°の角度で反射される。このような入射光を円偏光とし
て反射するために反射板5の表面には2重に薄層が形成
してある。この薄層の仕様を図3に示す。YAGレーザ
が出射する光は波長1064nmと532nmの2種で
ある。図3Aは波長1064nm用であり、図3Bは波
長532nm用である。反射板5(反射板6も同じ)の
基板51はSiでその仕様波長に対する屈折率をno,
第1層F52の屈折率をn2,第2層53の屈折率をn
2とすると、 no>n1>n2 の関係となるようにしてある。このため第1層にはSi
Nを用い第2層にはMgF2 を用いた。これらの屈折率
および層厚さは図3A,Bに記入してある。FIG. 1 shows the optical path of the emitted light of the laser 1 sent in the y-axis direction via the mirrors 3 and 5 of the optical system shown in FIG.
The laser beam is incident on the reflector 5 at an angle of 45 °,
It is reflected at an angle of °. In order to reflect such incident light as circularly polarized light, a double thin layer is formed on the surface of the reflection plate 5. The specifications of this thin layer are shown in FIG. The light emitted by the YAG laser is of two types having wavelengths of 1064 nm and 532 nm. FIG. 3A is for a wavelength of 1064 nm, and FIG. 3B is for a wavelength of 532 nm. The substrate 51 of the reflector 5 (same for the reflector 6) is made of Si and has a refractive index of no for the specified wavelength,
The refractive index of the first layer F52 is n2, the refractive index of the second layer 53 is n
If it is 2, the relation of no>n1> n2 is satisfied. Therefore, the first layer contains Si
N was used and MgF 2 was used for the second layer. These refractive indices and layer thicknesses are listed in Figures 3A and 3B.
【0008】[0008]
【発明の効果】本発明によれば高価な水晶製透過型1/
4波長板を用いないで表面薄膜を形成した反射素子で直
線偏光を円偏光に変換できる。EFFECTS OF THE INVENTION According to the present invention, an expensive crystal transmission type 1 /
It is possible to convert linearly polarized light into circularly polarized light with a reflecting element having a surface thin film formed without using a four-wave plate.
【図1】本発明の光学的構成を示す図FIG. 1 is a diagram showing an optical configuration of the present invention.
【図2】本発明の一実施例の斜視図FIG. 2 is a perspective view of an embodiment of the present invention.
【図3】上記実施例における反射板5,6の表面膜の構
成図FIG. 3 is a configuration diagram of a surface film of the reflection plates 5 and 6 in the above embodiment.
1,2 YAGレーザ 3,4 鏡 5,6 表面膜をコートした反射板 51,53 第1,第2の薄層 1, 2 YAG laser 3, 4 Mirror 5, 6 Reflective plate coated with surface film 51, 53 First and second thin layers
Claims (1)
を利用して、上記反射板に直線偏光を斜め入射させ、反
射光が円偏光となるようにしたことを特徴とする偏光変
換装置。1. A polarization conversion device characterized in that linearly polarized light is obliquely incident on the reflection plate so that reflected light becomes circularly polarized light by utilizing the polarization characteristics of the reflection plate having a thin layer formed on a substrate. apparatus.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP35848791A JPH05181013A (en) | 1991-12-28 | 1991-12-28 | Polarized light conversion device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP35848791A JPH05181013A (en) | 1991-12-28 | 1991-12-28 | Polarized light conversion device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05181013A true JPH05181013A (en) | 1993-07-23 |
Family
ID=18459573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP35848791A Pending JPH05181013A (en) | 1991-12-28 | 1991-12-28 | Polarized light conversion device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05181013A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1083563A (en) * | 1996-07-30 | 1998-03-31 | Samsung Electron Co Ltd | Optical pickup device |
-
1991
- 1991-12-28 JP JP35848791A patent/JPH05181013A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1083563A (en) * | 1996-07-30 | 1998-03-31 | Samsung Electron Co Ltd | Optical pickup device |
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