JP5267878B2 - Polarization adjuster - Google Patents

Polarization adjuster Download PDF

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JP5267878B2
JP5267878B2 JP2009208007A JP2009208007A JP5267878B2 JP 5267878 B2 JP5267878 B2 JP 5267878B2 JP 2009208007 A JP2009208007 A JP 2009208007A JP 2009208007 A JP2009208007 A JP 2009208007A JP 5267878 B2 JP5267878 B2 JP 5267878B2
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optical system
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beam splitter
polarization
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JP2011059310A (en
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泰幸 鈴木
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Yokogawa Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a polarization adjusting device which does not require a mechanism for making optical element rotate. <P>SOLUTION: A first optical system for separating an input light into two optical paths and then combining both of them is provided. The first optical system includes a half-wave plate, inserted to only one of the two optical paths in the first optical system and an adjustment part for adjusting an optical path length difference between the two optical paths in the first optical system. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、偏光の方向を調整する偏光調整器に関する。   The present invention relates to a polarization adjuster that adjusts the direction of polarization.

偏光依存損失を測定する場合、任意の偏光方向を生成するか、特定の条件を満たす４状態の偏光を生成する必要がある。基本的な偏光調整の方法として、λ／４板およびλ／２板の２種類の波長板を組み合わせる方法がある。この方法では、それぞれの波長板などを回転させることで偏光方向を制御することができる。   When measuring polarization dependent loss, it is necessary to generate an arbitrary polarization direction or to generate four-state polarized light that satisfies a specific condition. As a basic polarization adjustment method, there is a method of combining two types of wave plates, a λ / 4 plate and a λ / 2 plate. In this method, the polarization direction can be controlled by rotating each wave plate or the like.

特開平５−０８０２８９号公報JP-A-5-080289

しかし、光学素子を回転させるための回転機構には寿命があり、また機械的なトラブルを発生させるおそれもある。また、空中を光が通過する構成をとるため、ゴミや汚れに対する対策も必要となる。   However, the rotation mechanism for rotating the optical element has a lifetime and may cause a mechanical trouble. In addition, since light passes through the air, it is necessary to take measures against dust and dirt.

本発明の目的は、光学素子を回転させる機構を必要としない偏光調整器を提供することにある。   An object of the present invention is to provide a polarization adjuster that does not require a mechanism for rotating an optical element.

本発明の偏光調整器は、偏光の方向を調整する偏光調整器において、入力光を無偏光ビームスプリッタにより２つの光路に分離した後、両者を無偏光ビームスプリッタにより合成する第１の光学系を備え、前記第１の光学系は、前記第１の光学系における前記２つの光路の一方にのみ挿入された１／２波長板と、前記第１の光学系における前記２つの光路の光路長差を調整する調整部と、を具備し、前記入力光は円偏光であることを特徴とする。
この偏光調整器によれば、第１の光学系における２つの光路の光路長差の調整により偏光方向を制御するので、光学素子を回転させる機構を用いることなく、偏光方向を調整できる。
Polarization regulator of the present invention, the polarization adjuster for adjusting the direction of polarization, after separation into two optical paths by the input light non-polarizing beam splitter, a first optical system for synthesizing the non-polarizing beam splitter both The first optical system includes a half-wave plate inserted into only one of the two optical paths in the first optical system, and an optical path length difference between the two optical paths in the first optical system. And an adjustment unit for adjusting the input light, wherein the input light is circularly polarized light .
According to this polarization adjuster, since the polarization direction is controlled by adjusting the optical path length difference between the two optical paths in the first optical system, the polarization direction can be adjusted without using a mechanism for rotating the optical element.

直線偏光を無偏光ビームスプリッタにより２つの光路に分離した後、両者を無偏光ビームスプリッタにより合成する第２の光学系を備え、前記第２の光学系は、前記第２の光学系における前記２つの光路の一方にのみ挿入されて偏光方向を９０度回転させる１／２波長板と、前記第２の光学系における前記２つの光路の光路長差を調整する調整部と、を具備し、前記第２の光学系において得られた光を前記第１の光学系への前記入力光としてもよい。
After separation into two optical paths by a linearly polarized light non-polarizing beam splitter, a second optical system for combining the non-polarization beam splitter both, the second optical system, said in the second optical system 2 A half-wave plate that is inserted only in one of the two optical paths and rotates the polarization direction by 90 degrees, and an adjustment unit that adjusts an optical path length difference between the two optical paths in the second optical system, and The light obtained in the second optical system may be used as the input light to the first optical system.

直線偏光を無偏光ビームスプリッタにより２つの光路に分離した後、両者を無偏光ビームスプリッタにより合成する第３の光学系を備え、前記第３の光学系は、前記第３の光学系における前記２つの光路の両者にそれぞれ挿入され、光学軸方向が互いに４５度相違する２つの１／２波長板と、前記第３の光学系における前記２つの光路の光路長差を調整する調整部と、を具備し、前記第３の光学系において得られた円偏光を前記第１の光学系への前記入力光としてもよい。


After separation into two optical paths by a linearly polarized light non-polarizing beam splitter, a third optical system for synthesizing the non-polarizing beam splitter both, said third optical system, said in the third optical system 2 Two half-wave plates that are respectively inserted into both optical paths and whose optical axis directions are different from each other by 45 degrees, and an adjustment unit that adjusts an optical path length difference between the two optical paths in the third optical system, The circularly polarized light obtained in the third optical system may be used as the input light to the first optical system.


本発明の偏光調整器によれば、第１の光学系における２つの光路の光路長差の調整により偏光方向を制御するので、光学素子を回転させる機構を用いることなく、偏光方向を調整できる。   According to the polarization adjuster of the present invention, since the polarization direction is controlled by adjusting the optical path length difference between the two optical paths in the first optical system, the polarization direction can be adjusted without using a mechanism for rotating the optical element.

実施例１の偏光調整器の光学系の構成を示す図。FIG. 3 is a diagram illustrating a configuration of an optical system of the polarization adjuster according to the first embodiment. 合波の様子をポアンカレ球状での動きとして示す図。The figure which shows the mode of a wave as a movement in Poincare sphere. 実施例２の偏光調整器の光学系の構成を示す図。FIG. 6 is a diagram illustrating a configuration of an optical system of a polarization adjuster according to a second embodiment. 実施例３の偏光調整器の光学系の構成を示す図。FIG. 5 is a diagram illustrating a configuration of an optical system of a polarization adjuster according to a third embodiment. 実施例４の偏光調整器の光学系の構成を示す図The figure which shows the structure of the optical system of the polarization controller of Example 4.

次に、本発明による偏光調整器の実施形態について説明する。   Next, an embodiment of the polarization adjuster according to the present invention will be described.

以下、図１〜図２を参照して実施例１の偏光調整器について説明する。   Hereinafter, the polarization controller of the first embodiment will be described with reference to FIGS.

図１は実施例１の偏光調整器の光学系の構成を示す図である。   FIG. 1 is a diagram illustrating a configuration of an optical system of the polarization adjuster according to the first embodiment.

図１に示すように、直線偏光は分岐比が１：１の無偏光ビームスプリッタ１１により２分岐される。無偏光ビームスプリッタ１１を透過した光は位相調整板１２、ミラー１３、λ／２板１４を経由して分岐比が１：１の無偏光ビームスプリッタ１７に至る。一方、無偏光ビームスプリッタ１１で反射された光は位相調整板１５、ミラー１６を経由して無偏光ビームスプリッタ１７に至る。このように、分岐された直線偏光は異なる光路を経由して無偏光ビームスプリッタ１７に至り、合波、分岐される。なお、これらの２つの光路長は充分等しいものとされる。   As shown in FIG. 1, linearly polarized light is branched into two by a non-polarizing beam splitter 11 having a branching ratio of 1: 1. The light transmitted through the non-polarizing beam splitter 11 reaches the non-polarizing beam splitter 17 having a branching ratio of 1: 1 through the phase adjusting plate 12, the mirror 13, and the λ / 2 plate 14. On the other hand, the light reflected by the non-polarizing beam splitter 11 reaches the non-polarizing beam splitter 17 via the phase adjusting plate 15 and the mirror 16. In this way, the branched linearly polarized light reaches the non-polarizing beam splitter 17 via different optical paths, and is multiplexed and branched. Note that these two optical path lengths are sufficiently equal.

λ／２板１４の光学軸は入力光の偏光方向（水平方向）と４５度ずれて配置されているため、λ／２板１４において偏光方向は９０度回転される。このため、位相調整板１２または位相調整板１５により位相を調整し、同位相または反転位相で合波すると、無偏光ビームスプリッタ１７以降の光線は直線偏光となる。また、±９０度の位相差で合波すると無偏光ビームスプリッタ１７以降の光線は円偏光となる。   Since the optical axis of the λ / 2 plate 14 is disposed 45 degrees away from the polarization direction (horizontal direction) of the input light, the polarization direction of the λ / 2 plate 14 is rotated by 90 degrees. For this reason, when the phase is adjusted by the phase adjusting plate 12 or the phase adjusting plate 15 and multiplexed at the same phase or inverted phase, the light beams after the non-polarizing beam splitter 17 become linearly polarized light. Further, when combined with a phase difference of ± 90 degrees, the light beams after the non-polarizing beam splitter 17 become circularly polarized light.

無偏光ビームスプリッタ１７で合波、分岐された一方の光は、位相調整板２１、ミラー２２を経由して無偏光ビームスプリッタ２６に至る。無偏光ビームスプリッタ１７で合波、分岐された他方の光は、位相調整板２３、ミラー２４、λ／２板２５を経由して無偏光ビームスプリッタ２６に至る。両者は無偏光ビームスプリッタ２６で合波、分岐され、２つの出力光（出力Ｉおよび出力II）を生成する。   One light combined and branched by the non-polarizing beam splitter 17 reaches the non-polarizing beam splitter 26 via the phase adjusting plate 21 and the mirror 22. The other light combined and branched by the non-polarizing beam splitter 17 reaches the non-polarizing beam splitter 26 via the phase adjusting plate 23, the mirror 24, and the λ / 2 plate 25. Both are combined and branched by the non-polarizing beam splitter 26 to generate two output lights (output I and output II).

無偏光ビームスプリッタ１７での合波により直線偏光を生成する場合、λ／２板２５の光学軸は偏光方向と一致しているか直交しているため、偏光の変化はないものとして同一方向の直線偏光を無偏光ビームスプリッタ２６で合波する。このとき、位相調整板２１または位相調整板２３を調整して両者の位相差を９０度とすることで、出力光を円偏光とすることができる。   When linearly polarized light is generated by combining at the non-polarizing beam splitter 17, the optical axis of the λ / 2 plate 25 coincides with or is orthogonal to the polarization direction. The polarized light is multiplexed by the non-polarizing beam splitter 26. At this time, by adjusting the phase adjusting plate 21 or the phase adjusting plate 23 so that the phase difference between the two is 90 degrees, the output light can be circularly polarized light.

一方、無偏光ビームスプリッタ１７での合波により円偏光を生成する場合、λ／２板２５で円偏光の方向が反転する。このため、方向の異なる円偏光を無偏光ビームスプリッタ２６で合波することにより、直線偏光の出力光を得る。合波する際の位相差を位相調整板２１または位相調整板２３により調整することで、直線偏光の偏光方向を変えることができる。   On the other hand, when circularly polarized light is generated by multiplexing at the non-polarizing beam splitter 17, the direction of circularly polarized light is reversed by the λ / 2 plate 25. For this reason, circularly polarized light having different directions is multiplexed by the non-polarizing beam splitter 26 to obtain linearly polarized output light. The polarization direction of linearly polarized light can be changed by adjusting the phase difference at the time of multiplexing with the phase adjustment plate 21 or the phase adjustment plate 23.

図２は無偏光ビームスプリッタ２６での合波の様子をポアンカレ球状での動きとして示す図である。図２において矢印Ａは円偏光を生成する場合を示している。この場合、位相調整により上下の両極（円偏光）を含む経線を周回することになる。また、図２において矢印Ｂは直線偏光を生成する場合を示しており、位相調整により赤道を周回することになる。   FIG. 2 is a diagram showing a state of multiplexing at the non-polarizing beam splitter 26 as a Poincare spherical movement. In FIG. 2, an arrow A indicates a case where circularly polarized light is generated. In this case, the meridian including both upper and lower poles (circularly polarized light) is circulated by phase adjustment. Further, in FIG. 2, an arrow B indicates a case where linearly polarized light is generated, and it goes around the equator by phase adjustment.

このように、上記実施形態では、位相板により光路長差を調整することにより偏光方向を制御しているので、光学素子を回転させる機構を用いることなく、偏光方向を調整できる。このため、装置の信頼性向上、小型化、軽量化を図ることができる。   Thus, in the above embodiment, the polarization direction is controlled by adjusting the optical path length difference with the phase plate, so that the polarization direction can be adjusted without using a mechanism for rotating the optical element. For this reason, the reliability of the apparatus can be improved, the size can be reduced, and the weight can be reduced.

なお、上記の波長板には通常、水晶などの複屈折材料が用いられる。また、位相調整板の材質として、熱光学効果を利用する場合にはＳｉなどが、電気光学効果を利用する場合にはＬＮなどが、それぞれ使用される。   Note that a birefringent material such as quartz is usually used for the wave plate. As the material of the phase adjusting plate, Si or the like is used when the thermo-optic effect is used, and LN or the like is used when the electro-optic effect is used.

以下、図３を参照して実施例２の偏光調整器について説明する。   Hereinafter, the polarization controller of the second embodiment will be described with reference to FIG.

図３は実施例２の偏光調整器の光学系の構成を示す図である。   FIG. 3 is a diagram illustrating the configuration of the optical system of the polarization adjuster according to the second embodiment.

図３に示すように、本実施例の偏光調整器は、無偏光ビームスプリッタ３１、位相調整板３２、リフレクタ３３、位相調整板３４、リフレクタ３５、λ／４板３６、位相調整板３７、リフレクタ３８、λ／４板３９、位相調整板４０、およびリフレクタ４１を備える。入力光はリフレクタ３３、リフレクタ３７を順次経由する光路と、リフレクタ３８、リフレクタ３１を順次経由する光路とに分岐される。   As shown in FIG. 3, the polarization adjuster of this embodiment includes a non-polarizing beam splitter 31, a phase adjustment plate 32, a reflector 33, a phase adjustment plate 34, a reflector 35, a λ / 4 plate 36, a phase adjustment plate 37, and a reflector. 38, a λ / 4 plate 39, a phase adjusting plate 40, and a reflector 41. The input light is branched into an optical path that sequentially passes through the reflector 33 and the reflector 37 and an optical path that sequentially passes through the reflector 38 and the reflector 31.

本実施例の偏光調整器は、実施例１の偏光調整器をマッハツェンダ型からマイケルソン型に変形したものであり、偏光方向を制御する方法は同じである。波長板および位相調整板を往復光路でそれぞれ２回ずつ通過させるため、実施例１におけるλ／２板はλ／４板に置換されている。また、位相調整板での調整量（光路長変化量）は２倍となる。   The polarization adjuster of the present example is a modification of the polarization adjuster of Example 1 from the Mach-Zehnder type to the Michelson type, and the method for controlling the polarization direction is the same. In order to pass the wave plate and the phase adjusting plate twice each in the reciprocating optical path, the λ / 2 plate in the first embodiment is replaced with a λ / 4 plate. Further, the adjustment amount (optical path length change amount) at the phase adjustment plate is doubled.

以下、図４を参照して実施例３の偏光調整器について説明する。   Hereinafter, the polarization adjuster of the third embodiment will be described with reference to FIG.

図４は実施例３の偏光調整器の光学系の構成を示す図である。   FIG. 4 is a diagram illustrating the configuration of the optical system of the polarization adjuster of the third embodiment.

本実施例の偏光調整器では、任意の偏光方向の直線偏光を分岐比が１：１の無偏光ビームスプリッタ５１により２分岐する。無偏光ビームスプリッタ５１を透過した光は位相調整板５２、ミラー５３、λ／２板５４を経由して分岐比が１：１の無偏光ビームスプリッタ５８に至る。一方、無偏光ビームスプリッタ１１で反射された光は位相調整板５５、ミラー５６、λ／２板５７を経由して無偏光ビームスプリッタ５８に至る。このように、分岐された直線偏光は異なる光路を経由して無偏光ビームスプリッタ５８に至り、合波、分岐される。なお、これらの２つの光路長は充分等しいものとされる。   In the polarization adjuster of the present embodiment, linearly polarized light in an arbitrary polarization direction is branched into two by a non-polarizing beam splitter 51 having a branching ratio of 1: 1. The light transmitted through the non-polarizing beam splitter 51 reaches the non-polarizing beam splitter 58 having a branching ratio of 1: 1 through the phase adjusting plate 52, the mirror 53, and the λ / 2 plate 54. On the other hand, the light reflected by the non-polarizing beam splitter 11 reaches the non-polarizing beam splitter 58 via the phase adjusting plate 55, the mirror 56, and the λ / 2 plate 57. In this way, the branched linearly polarized light reaches the non-polarizing beam splitter 58 via different optical paths, and is multiplexed and branched. Note that these two optical path lengths are sufficiently equal.

ここで、λ／２板５４の光学軸とλ／２板５７の光学軸は、互いに４５度ずれているので、λ／２板５４およびλ／２板５７をそれぞれ通過した直線偏光の偏光方向は、常に互いに直交したものとなる。このため、位相調整板５２または位相調整板５５により位相を調整し、±９０度の位相差で合波すると無偏光ビームスプリッタ５８以降の光線は円偏光となる。   Here, since the optical axis of the λ / 2 plate 54 and the optical axis of the λ / 2 plate 57 are deviated from each other by 45 degrees, the polarization direction of the linearly polarized light that has passed through the λ / 2 plate 54 and the λ / 2 plate 57, respectively. Are always orthogonal to each other. Therefore, when the phase is adjusted by the phase adjustment plate 52 or the phase adjustment plate 55 and combined with a phase difference of ± 90 degrees, the light beams after the non-polarizing beam splitter 58 become circularly polarized light.

無偏光ビームスプリッタ５８で分岐された一方の円偏光は、位相調整板６１、ミラー６２を経由して無偏光ビームスプリッタ６６に至る。無偏光ビームスプリッタ５８で分岐された他方の円偏光は、位相調整板６３、ミラー６４、λ／２板６５を経由して無偏光ビームスプリッタ６６に至る。両者は無偏光ビームスプリッタ６６で合波、分岐され、２つの出力光（出力Ｉおよび出力II）を生成する。   One circularly polarized light branched by the non-polarizing beam splitter 58 reaches the non-polarizing beam splitter 66 via the phase adjusting plate 61 and the mirror 62. The other circularly polarized light branched by the non-polarizing beam splitter 58 reaches the non-polarizing beam splitter 66 via the phase adjusting plate 63, the mirror 64, and the λ / 2 plate 65. Both are combined and branched by a non-polarizing beam splitter 66 to generate two output lights (output I and output II).

この場合、λ／２板６５で円偏光の偏光方向が反転する。このため、方向の異なる円偏光を無偏光ビームスプリッタ６６で合波することにより、直線偏光の出力光を得る。合波する際の位相差を位相調整板６１または位相調整板６３により調整することで、直線偏光の偏光方向を変えることができる。   In this case, the polarization direction of circularly polarized light is reversed by the λ / 2 plate 65. For this reason, the circularly polarized light having different directions is multiplexed by the non-polarizing beam splitter 66 to obtain linearly polarized output light. The polarization direction of the linearly polarized light can be changed by adjusting the phase difference at the time of multiplexing with the phase adjustment plate 61 or the phase adjustment plate 63.

以下、図５を参照して実施例４の偏光調整器について説明する。   Hereinafter, the polarization adjuster of the fourth embodiment will be described with reference to FIG.

図５は実施例４の偏光調整器の光学系の構成を示す図である。   FIG. 5 is a diagram illustrating the configuration of the optical system of the polarization adjuster of the fourth embodiment.

図５に示すように、本実施例の偏光調整器は、無偏光ビームスプリッタ７１、λ／４板７２、位相調整板７３、リフレクタ７４、位相調整板７５、リフレクタ７６、λ／４板７７、位相調整板７８、リフレクタ７９、λ／４板８０、位相調整板８１、およびリフレクタ８２を備える。入力光はリフレクタ７４、リフレクタ７６を順次経由する光路と、リフレクタ７９、リフレクタ８２を順次経由する光路とに分岐される。   As shown in FIG. 5, the polarization adjuster of this embodiment includes a non-polarizing beam splitter 71, a λ / 4 plate 72, a phase adjustment plate 73, a reflector 74, a phase adjustment plate 75, a reflector 76, a λ / 4 plate 77, A phase adjustment plate 78, a reflector 79, a λ / 4 plate 80, a phase adjustment plate 81, and a reflector 82 are provided. The input light is branched into an optical path that sequentially passes through the reflector 74 and the reflector 76, and an optical path that sequentially passes through the reflector 79 and the reflector 82.

本実施例の偏光調整器は、実施例３の偏光調整器をマッハツェンダ型からマイケルソン型に変形したものであり、偏光方向を制御する方法は同じである。波長板および位相調整板を往復光路でそれぞれ２回ずつ通過させるため、実施例１におけるλ／２板はλ／４板に置換されている。また、位相調整板での調整量（光路長変化量）は２倍となる。   The polarization adjuster of the present example is a modification of the polarization adjuster of Example 3 from the Mach-Zehnder type to the Michelson type, and the method for controlling the polarization direction is the same. In order to pass the wave plate and the phase adjusting plate twice each in the reciprocating optical path, the λ / 2 plate in the first embodiment is replaced with a λ / 4 plate. Further, the adjustment amount (optical path length change amount) at the phase adjustment plate is doubled.

以上説明したように、本発明の偏光調整器によれば、２つの光路の光路長差の調整により偏光方向を制御するので、光学素子を回転させる機構を用いることなく、偏光方向を調整できる。このため、装置の信頼性向上、小型化、軽量化を図ることができる。   As described above, according to the polarization adjuster of the present invention, since the polarization direction is controlled by adjusting the optical path length difference between the two optical paths, the polarization direction can be adjusted without using a mechanism for rotating the optical element. For this reason, the reliability of the apparatus can be improved, the size can be reduced, and the weight can be reduced.

なお、上記各実施例では、分岐された両方の光路にそれぞれ位相調整板を挿入しているが、一方の光路のみに位相調整板を挿入してもよい。   In each of the above embodiments, the phase adjustment plate is inserted into both branched optical paths, but the phase adjustment plate may be inserted into only one of the optical paths.

本発明の適用範囲は上記実施形態に限定されることはない。本発明は、偏光の方向を調整する偏光調整器に対し、広く適用することができる。   The scope of application of the present invention is not limited to the above embodiment. The present invention can be widely applied to a polarization adjuster that adjusts the direction of polarization.

１２ 位相調整板（調整部）
１４ λ／２板（１／２波長板）
１５ 位相調整板（調整部）
２１ 位相調整板（調整部）
２３ 位相調整板（調整部）
２５ λ／２板（１／２波長板）
３２ 位相調整板（調整部）
３４ 位相調整板（調整部）
３６ λ／４板（１／２波長板）
３７ 位相調整板（調整部）
２５ λ／２板（１／２波長板）
３９ λ／４板（１／２波長板）
４０ 位相調整板（調整部）
５２ 位相調整板（調整部）
５４ λ／２板（１／２波長板）
５５ 位相調整板（調整部）
５７ λ／２板（１／２波長板）
６１ 位相調整板（調整部）
６３ 位相調整板（調整部）
６５ λ／２板（１／２波長板）
７２ λ／４板（１／２波長板）
７３ 位相調整板（調整部）
７５ 位相調整板（調整部）
７７ λ／４板（１／２波長板）
７８ 位相調整板（調整部）
８０ λ／４板（１／２波長板）
８１ 位相調整板（調整部） 12 Phase adjustment plate (adjustment unit)
14 λ / 2 plate (1/2 wavelength plate)
15 Phase adjustment plate (adjustment part)
21 Phase adjustment plate (adjustment unit)
23 Phase adjustment plate (Adjustment unit)
25 λ / 2 plate (1/2 wavelength plate)
32 Phase adjustment plate (Adjustment unit)
34 Phase adjustment plate (adjustment part)
36 λ / 4 plate (1/2 wavelength plate)
37 Phase adjustment plate (Adjustment unit)
25 λ / 2 plate (1/2 wavelength plate)
39 λ / 4 plate (1/2 wavelength plate)
40 Phase adjustment plate (Adjustment unit)
52 Phase adjustment plate (adjustment unit)
54 λ / 2 plate (1/2 wavelength plate)
55 Phase adjustment plate (adjustment unit)
57 λ / 2 plate (1/2 wavelength plate)
61 Phase adjustment plate (adjustment unit)
63 Phase adjustment plate (adjustment part)
65 λ / 2 plate (1/2 wavelength plate)
72 λ / 4 plate (1/2 wavelength plate)
73 Phase adjustment plate (adjustment part)
75 Phase adjustment plate (adjustment unit)
77 λ / 4 plate (1/2 wavelength plate)
78 Phase adjustment plate (Adjustment unit)
80 λ / 4 plate (1/2 wavelength plate)
81 Phase adjustment plate (adjustment unit)

Claims (3)

偏光の方向を調整する偏光調整器において、
入力光を無偏光ビームスプリッタにより２つの光路に分離した後、両者を無偏光ビームスプリッタにより合成する第１の光学系を備え、
前記第１の光学系は、
前記第１の光学系における前記２つの光路の一方にのみ挿入された１／２波長板と、
前記第１の光学系における前記２つの光路の光路長差を調整する調整部と、
を具備し、
前記入力光は円偏光であることを特徴とする偏光調整器。 In a polarization adjuster that adjusts the direction of polarization,
After separation into two optical paths by the input light non-polarizing beam splitter comprises a first optical system for synthesizing the non-polarizing beam splitter both,
The first optical system includes:
A half-wave plate inserted into only one of the two optical paths in the first optical system;
An adjusting unit for adjusting a difference in optical path length between the two optical paths in the first optical system;
Equipped with,
The polarization adjuster, wherein the input light is circularly polarized light . 直線偏光を無偏光ビームスプリッタにより２つの光路に分離した後、両者を無偏光ビームスプリッタにより合成する第２の光学系を備え、
前記第２の光学系は、
前記第２の光学系における前記２つの光路の一方にのみ挿入されて偏光方向を９０度回転させる１／２波長板と、
前記第２の光学系における前記２つの光路の光路長差を調整する調整部と、
を具備し、
前記第２の光学系において得られた光を前記第１の光学系への前記入力光とすることを特徴とする請求項１に記載の偏光調整器。 After separation into two optical paths by a linearly polarized light non-polarizing beam splitter, a second optical system for combining the non-polarization beam splitter both,
The second optical system includes:
A half-wave plate that is inserted into only one of the two optical paths in the second optical system and rotates the polarization direction by 90 degrees;
An adjustment unit for adjusting an optical path length difference between the two optical paths in the second optical system;
Comprising
The polarization adjuster according to claim 1, wherein the light obtained in the second optical system is used as the input light to the first optical system. 直線偏光を無偏光ビームスプリッタにより２つの光路に分離した後、両者を無偏光ビームスプリッタにより合成する第３の光学系を備え、
前記第３の光学系は、
前記第３の光学系における前記２つの光路の両者にそれぞれ挿入され、光学軸方向が互いに４５度相違する２つの１／２波長板と、
前記第３の光学系における前記２つの光路の光路長差を調整する調整部と、
を具備し、
前記第３の光学系において得られた円偏光を前記第１の光学系への前記入力光とすることを特徴とする請求項１に記載の偏光調整器。 After separation into two optical paths by a linearly polarized light non-polarizing beam splitter, a third optical system for synthesizing the non-polarizing beam splitter both,
The third optical system includes:
Two half-wave plates inserted respectively in both of the two optical paths in the third optical system and having optical axis directions different from each other by 45 degrees;
An adjustment unit for adjusting an optical path length difference between the two optical paths in the third optical system;
Comprising
The polarization controller according to claim 1, wherein the circularly polarized light obtained in the third optical system is used as the input light to the first optical system.
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