JP3214129B2 - Nonlinear optical element - Google Patents
Nonlinear optical elementInfo
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- JP3214129B2 JP3214129B2 JP03327893A JP3327893A JP3214129B2 JP 3214129 B2 JP3214129 B2 JP 3214129B2 JP 03327893 A JP03327893 A JP 03327893A JP 3327893 A JP3327893 A JP 3327893A JP 3214129 B2 JP3214129 B2 JP 3214129B2
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- JP
- Japan
- Prior art keywords
- light
- optical
- nonlinear optical
- reference light
- nonlinear
- Prior art date
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、オプトエレクトロニク
ス、光情報処理、光通信等の分野において用いられる非
線形光学素子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonlinear optical element used in fields such as optoelectronics, optical information processing, and optical communication.
【０００２】[0002]
【従来の技術およびその問題点】非線形光学材料は、レ
ーザー光の強電界下、二次以上の非線形応答を示す材料
であって、周波数変換、発振、スイッチング等の光信号
処理において重要な素材である。特に、三次非線形光学
材料は、光が有する高速性、並列性という優れた特性を
十分に発揮させた次世代の光通信、情報処理における基
幹素材として注目されている。この三次非線形光学材料
を用いた非線形光学素子は、光の照射に対して屈折率が
変化することを利用しようとするものであり、例えば、
光カーシャッターが知られている。光カーシャッターは
非線形光学材料に強い制御光を照射して、非線形光学材
料を透過する参照光の偏光状態を変化させることによ
り、光−光スイッチング、光−光制御を行うものであ
る。2. Description of the Related Art A nonlinear optical material is a material that exhibits a second-order or higher nonlinear response under a strong electric field of laser light, and is an important material in optical signal processing such as frequency conversion, oscillation, and switching. is there. In particular, tertiary nonlinear optical materials are attracting attention as key materials in next-generation optical communication and information processing that fully exhibit the excellent characteristics of light, such as high speed and parallelism. The nonlinear optical element using the third-order nonlinear optical material is to utilize the fact that the refractive index changes with light irradiation, for example,
Optical car shutters are known. The optical Kerr shutter performs light-light switching and light-light control by irradiating the nonlinear optical material with strong control light and changing the polarization state of the reference light transmitted through the nonlinear optical material.
【０００３】図１に従来の光カーシャッターの一例の概
略図を示す。１１は非線形光学材料であり、ＣＳ2を光
学セルに入れたものである。１４は方位を垂直方向に設
定した偏光子であり、波長λ1 の参照光１２は偏光子１
４により垂直方向に偏光する。したがって、制御光１３
が入射されていない時、参照光は、方位を水平方向に設
定した検光子１５により遮断される。一方、波長λ2 の
制御光１３を方位が４５゜傾いた偏光子１６により偏光
面が４５゜傾いた直線偏光として、非線形光学材料１１
に入射させると、制御光は強い光であるため非線形光学
材料１１に非線形屈折率変化を引き起こす。この時、制
御光の偏光面は参照光の偏光面に対して傾いているた
め、参照光は楕円偏光となる。そのため、参照光に水平
成分が生じ、これが検光子１５を透過する。このよう
に、従来、光−光スイッチングを実現するには、例えば
参照光に対して偏光面を傾けるといった工夫を制御光の
偏光に加えたり、さらに検光子も参照光の偏光子と直交
させる必要があるため、様々な方位の偏光子を準備しな
くてはならず、このために素子の構成が複雑になるとい
う問題があった。FIG. 1 is a schematic view showing an example of a conventional optical car shutter. Reference numeral 11 denotes a nonlinear optical material in which CS 2 is put in an optical cell. Reference numeral 14 denotes a polarizer whose azimuth is set in the vertical direction, and the reference light 12 having the wavelength λ 1 is the polarizer 1
4. Polarize in the vertical direction. Therefore, the control light 13
Is not incident, the reference light is blocked by the analyzer 15 whose azimuth is set in the horizontal direction. On the other hand, the control light 13 having the wavelength λ 2 is converted into linearly polarized light whose polarization plane is inclined by 45 ° by the polarizer 16 whose orientation is inclined by 45 °.
When the control light is incident on the nonlinear optical material 11, the control light is intense light and causes a nonlinear refractive index change in the nonlinear optical material 11. At this time, since the polarization plane of the control light is inclined with respect to the polarization plane of the reference light, the reference light becomes elliptically polarized light. For this reason, a horizontal component is generated in the reference light, and this passes through the analyzer 15. As described above, conventionally, in order to realize light-light switching, it is necessary to add a contrivance such as inclining the polarization plane with respect to the reference light to the polarization of the control light, and furthermore, make the analyzer orthogonal to the polarizer of the reference light. Therefore, it is necessary to prepare polarizers having various orientations, which causes a problem that the configuration of the element becomes complicated.
【０００４】[0004]
【問題点を解決するための手段】本発明の目的は、前記
問題点を解決し、旋光性物質の旋光分散特性を利用する
ことにより、三次非線形光学効果による屈折率変化を感
度良く取り出すことができる新規な非線形光学素子を提
供することである。本発明は、参照光の偏光状態を参照
光の波長と異なる波長の光で制御する非線形光学素子で
あって、非線形光学材料が三次非線形性と旋光分散特性
を有し、同一偏光面で入射した波長の異なる参照光と制
御光が、非線形光学材料の持つ旋光分散により、参照光
と制御光の偏光面間に角度を生じることにより、三次非
線形光学効果による屈折率変化を、参照光の偏光変化と
して取り出すことを特徴とする非線形光学素子に関す
る。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to take out the change in the refractive index due to the third-order nonlinear optical effect with high sensitivity by utilizing the optical rotation dispersion characteristic of the optical rotation substance. It is to provide a novel nonlinear optical element that can be used. The present invention is a nonlinear optical element that controls the polarization state of the reference light with light having a wavelength different from the wavelength of the reference light, wherein the nonlinear optical material has third-order nonlinearity and optical rotation dispersion characteristics, and is incident on the same polarization plane. The reference light and the control light having different wavelengths generate an angle between the polarization planes of the reference light and the control light due to the optical rotation dispersion of the nonlinear optical material. And a non-linear optical element.
【０００５】本発明の非線形光学材料の形態としては、
旋光分散性能を有する物質及び三次非線形性を有する物
質をポリマー中にドープしたものや、旋光分散性能を有
する物質を三次非線形性を有するポリマー中にドープし
たもの、逆に、三次非線形性を有する物質を旋光分散性
能を有するポリマー中にドープしたものが挙げられる。
あるいは、旋光分散性能を有する物質と三次非線形性を
有する物質の会合体でもよい。また、本発明の非線形光
学材料の他の形態としては、１つの物質が旋光分散性能
と三次非線形性を併せ持つものが挙げられ、例えば、ポ
リマーの側鎖に旋光分散性能を有する物質及び三次非線
形性を有する物質を導入したものや、旋光分散性能を有
するポリマーの側鎖に三次非線形性を有する物質を導入
したもの、逆に、三次非線形性を有するポリマーの側鎖
に旋光分散性能を有する物質を導入したものが挙げられ
る。もちろん、三次非線形性を有する物質自体が旋光分
散性能をもつものでもよく、この場合の三次非線形性と
旋光分散性能の起源は同一でも別々に存在してもよい。
さらに、本発明の非線形光学材料の他の形態としては、
旋光分散性能を有する物質を含有する層と三次非線形性
を有する物質を含有する層を交互に複数層積層したもの
でもよい。[0005] The form of the nonlinear optical material of the present invention includes:
A substance having optical rotation dispersion performance and a substance having third-order nonlinearity doped in a polymer, a substance having optical rotation dispersion performance doped into a polymer having third-order nonlinearity, and conversely, a substance having third-order nonlinearity In a polymer having optical rotation dispersion performance.
Alternatively, it may be an aggregate of a substance having optical rotation dispersion performance and a substance having third-order nonlinearity. Further, as another form of the nonlinear optical material of the present invention, there is a material in which one substance has both optical rotation dispersion performance and tertiary nonlinearity. Or a substance having a tertiary nonlinearity in the side chain of a polymer having optical rotation dispersing ability, and conversely, a substance having an optical rotation dispersing property in the side chain of a polymer having tertiary nonlinearity. The ones introduced are listed. Of course, the substance having the third-order nonlinearity may itself have optical rotation dispersion performance, and in this case, the origin of the third-order nonlinearity and the optical rotation dispersion performance may be the same or different.
Further, as another embodiment of the nonlinear optical material of the present invention,
A layer in which a plurality of layers containing a substance having optical rotation dispersion performance and a layer containing a substance having third-order nonlinearity are alternately laminated.
【０００６】旋光分散性能を有する物質としては、物質
自体が旋光分散性能を有するキラル化合物や、結晶化に
より旋光分散性能を示す物質、あるいは、外部の電場、
磁場、あるいは基板のラビング等により旋光分散性能を
示す物質などが挙げられる。例えば、アミノ酸、ポリペ
プチド、酒石酸、ヘリセン、水晶、コレステリック液
晶、ネマチック液晶等が挙げられる。また、三次非線形
性を有する物質としては、大きな非局在化π電子系を有
するものが挙げられ、例えば、ＤＡＮＳＥ（４−ジメチ
ルアミノ−４’−ニトロスチルベン）、テトラキス
（２，４−キシリル）ブタトリエン、９，１０−ビス
（３，３−ジフェニル−３−ヒドロキシプロピニル）ア
ントラセン、２−（４−ニトロフェニル）−４，５−ジ
フェニルイミダゾール、２−（４−ニトロフェニル）−
４，５−ビス（４−メトキシフェニル）イミダゾール、
テトラチオテトラセン、３，６−ビス（４，５−ジフェ
ニル−２Ｈ−イミダゾール−２−イリデン）−１，４−
シクロヘキサジエン、２−（チオピラン−４−イリデ
ン）−１，３−ジチオール、１，１，６，６−テトラフ
ェニル−ヘキサ−１，５−ジエン−３イン、３，３’−
ジエチルオキサカルボシアニン、３，３’−ジエチルオ
キサジカルボシアニンが挙げられ、また励起子の効果に
よるＣｕＣｌ、ＣｄＳｅ、ＺｎＳｅ等が挙げられる。As the substance having optical rotation dispersion performance, a chiral compound which itself has optical rotation dispersion performance, a substance exhibiting optical rotation dispersion performance by crystallization, an external electric field,
Substances that exhibit optical rotation dispersion performance by a magnetic field, rubbing of a substrate, or the like can be used. Examples include amino acids, polypeptides, tartaric acid, helicene, quartz, cholesteric liquid crystals, nematic liquid crystals, and the like. Examples of the substance having a third-order nonlinearity include a substance having a large delocalized π-electron system, such as DANSE (4-dimethylamino-4′-nitrostilbene) and tetrakis (2,4-xylyl). Butatriene, 9,10-bis (3,3-diphenyl-3-hydroxypropynyl) anthracene, 2- (4-nitrophenyl) -4,5-diphenylimidazole, 2- (4-nitrophenyl)-
4,5-bis (4-methoxyphenyl) imidazole,
Tetrathiotetracene, 3,6-bis (4,5-diphenyl-2H-imidazole-2-ylidene) -1,4-
Cyclohexadiene, 2- (thiopyran-4-ylidene) -1,3-dithiol, 1,1,6,6-tetraphenyl-hexa-1,5-diene-3-yne, 3,3′-
Examples thereof include diethyloxacarbocyanine and 3,3′-diethyloxadicarbocyanine, and examples thereof include CuCl, CdSe, and ZnSe due to the effect of excitons.
【０００７】本発明においては、非線形光学素子に入射
する参照光の偏光状態を参照光の波長と異なる波長の光
で制御する。即ち、同一偏光面で入射した波長の異なる
参照光と制御光は、非線形材料の持つ旋光分散により、
材料内部で参照光と制御光の偏光面間に角度を生じるの
で、制御光によって参照光の偏光変化を引き起こすこと
ができる。したがって、簡単な偏光子の構成で光−光制
御素子を得ることができる。さらに、参照光に対する旋
光角が９０°＋ｎ×１８０°（ｎは整数）となるように
光路長や濃度を設定することにより、全て同一方位の偏
光子だけで、光−光スイッチング素子を構成することが
できる。In the present invention, the polarization state of the reference light incident on the nonlinear optical element is controlled with light having a wavelength different from the wavelength of the reference light. That is, the reference light and the control light having different wavelengths incident on the same polarization plane, due to the optical rotation dispersion of the nonlinear material,
Since an angle is generated between the polarization planes of the reference light and the control light inside the material, the control light can cause a change in the polarization of the reference light. Therefore, a light-light control element can be obtained with a simple polarizer configuration. Furthermore, by setting the optical path length and the concentration such that the optical rotation angle with respect to the reference light is 90 ° + n × 180 ° (n is an integer), the light-light switching element is constituted only by polarizers having the same direction. be able to.
【０００８】[0008]
【実施例】以下に、実施例を示して本発明を具体的に説
明する。 実施例１ 図２は、本発明の非線形光学素子を用いた光−光スイッ
チング装置の概略図である。２１は非線形光学材料であ
り、ポリ−Ｌ−グルタミン酸とＤＡＮＳＥをジクロロエ
タンに溶解し、キャスト後、溶媒を除去して得られたフ
ィルムである。２４及び２５は方位を垂直方向に設定し
た偏光子であり、２４は偏光子として、２５は検光子と
して働く。非線形光学材料２１は、波長λ1 の参照光２
２を偏光子２４により垂直方向の直線偏光として透過さ
せると、偏光面が９０°回転するように光路長を設定し
ている。したがって、制御光が入射されていない時、偏
光面が９０°回転して水平方向となった参照光は、方位
が垂直方向の検光子２５により遮断される。The present invention will be specifically described below with reference to examples. Embodiment 1 FIG. 2 is a schematic diagram of an optical-optical switching device using the nonlinear optical element of the present invention. Reference numeral 21 denotes a non-linear optical material, which is a film obtained by dissolving poly-L-glutamic acid and DANSE in dichloroethane, casting, and then removing the solvent. Reference numerals 24 and 25 denote polarizers whose azimuths are set in the vertical direction. 24 functions as a polarizer, and 25 functions as an analyzer. The nonlinear optical material 21 includes a reference light 2 having a wavelength λ 1 .
The optical path length is set so that the polarization plane is rotated by 90 ° when 2 is transmitted by the polarizer 24 as linearly polarized light in the vertical direction. Therefore, when the control light is not incident, the reference light whose polarization plane has been rotated by 90 ° and is in the horizontal direction is blocked by the analyzer 25 whose azimuth is in the vertical direction.
【０００９】一方、波長λ2 の制御光２３を偏光子２４
により垂直方向の直線偏光として、非線形光学材料２１
に入射させると、制御光は強い光であるため非線形光学
材料２１に非線形光学効果を引き起こす。この時、制御
光と参照光は波長が異なるため、旋光分散により偏光面
の回転角度が異なっている。即ち、参照光の偏光面が制
御光の偏光面に対して傾いた状態で、非線形光学効果が
誘起されるので、その結果、参照光は楕円偏光となる。
そのため、参照光に垂直成分が生じ、これが検光子２５
を透過する。以上のように、本発明によれば、参照光と
制御光が同一の偏光面であっても、参照光と制御光の波
長を変えて非線形光学材料に入射させることにより、旋
光分散性能と三次非線形性を利用して光−光スイッチン
グ装置を実現できる。 実施例２ 非線形光学材料として（＋）−ヘキサヘリセンの４％Ｃ
Ｓ2溶液を用い、図２と同様の装置において、４４０ｎ
ｍの参照光と５３５ｎｍの制御光を同一偏光面で入射さ
せ、制御光の強度と検出光の強度の関係を調べた。その
結果は図３に示すように、制御光の強度の２乗に比例し
た検出光が得られ、カーシャッターが動作していること
が確認された。On the other hand, the control light 23 having the wavelength λ 2 is
As linearly polarized light in the vertical direction, the nonlinear optical material 21
When the light is incident on the nonlinear optical material 21, the nonlinear optical effect is caused in the nonlinear optical material 21 because the control light is strong light. At this time, since the control light and the reference light have different wavelengths, the rotation angles of the polarization planes are different due to optical rotation dispersion. That is, the nonlinear optical effect is induced in a state where the polarization plane of the reference light is inclined with respect to the polarization plane of the control light. As a result, the reference light becomes elliptically polarized light.
Therefore, a vertical component is generated in the reference light, which is
Through. As described above, according to the present invention, even when the reference light and the control light have the same polarization plane, the optical rotation dispersion performance and the tertiary An optical-optical switching device can be realized using nonlinearity. Example 2 4% C of (+)-hexahelicene as a nonlinear optical material
Using an S 2 solution, in the same device as in FIG.
The reference light of m and the control light of 535 nm were incident on the same polarization plane, and the relationship between the intensity of the control light and the intensity of the detection light was examined. As a result, as shown in FIG. 3, detection light proportional to the square of the intensity of the control light was obtained, and it was confirmed that the car shutter was operating.
【図１】図１は、従来の光−光スイッチング装置の概略
図である。FIG. 1 is a schematic diagram of a conventional optical-optical switching device.
【図２】図２は、本発明の一実施例の光−光スイッチン
グ装置の概略図である。FIG. 2 is a schematic diagram of an optical-optical switching device according to one embodiment of the present invention.
【図３】図３は、実施例２における制御光の強度と検出
光の強度の関係を示す図である。FIG. 3 is a diagram illustrating a relationship between the intensity of control light and the intensity of detection light according to the second embodiment.
１１ 非線形光学材料 １２ 参照光 １３ 制御光 １４，１６ 偏光子 １５ 検光子 ２１ 非線形光学材料 ２２ 参照光 ２３ 制御光 ２４ 偏光子 ２５ 検光子 DESCRIPTION OF SYMBOLS 11 Nonlinear optical material 12 Reference light 13 Control light 14, 16 Polarizer 15 Analyzer 21 Nonlinear optical material 22 Reference light 23 Control light 24 Polarizer 25 Analyzer
フロントページの続き (56)参考文献 特開 平１−182832（ＪＰ，Ａ) 特開 昭63−157133（ＪＰ，Ａ) 1991年（平成３年）秋季第52回応用物 理学会学術講演会予稿集第３分冊 ｐ ｐ．1126（講演番号11ｐ−Ｔ−７）横沢 伊裕 他 (58)調査した分野(Int.Cl.7，ＤＢ名) G02F 1/35 - 1/365 ＪＩＣＳＴファイル（ＪＯＩＳ) ＷＰＩ（ＤＩＡＬＯＧ)Continuation of front page (56) References JP-A-1-182283 (JP, A) JP-A-63-157133 (JP, A) Proceedings of the 52nd Autumn Meeting of the Japan Society of Applied Physics (1991) 3rd volume p p. 1126 (lecture number 11p-T-7) Yokozawa Ihiro et al. (58) Field surveyed (Int. Cl. 7 , DB name) G02F 1/35-1/365 JICST file (JOIS) WPI (DIALOG)
Claims (1)
る波長の光で制御する非線形光学素子であって、非線形
光学材料が三次非線形性と旋光分散特性を有し、同一偏
光面で入射した波長の異なる参照光と制御光が、非線形
光学材料の持つ旋光分散により、参照光と制御光の偏光
面間に角度を生じることにより、三次非線形光学効果に
よる屈折率変化を、参照光の偏光変化として取り出すこ
とを特徴とする非線形光学素子。1. A nonlinear optical element for controlling the polarization state of a reference light with light having a wavelength different from the wavelength of the reference light, wherein the nonlinear optical material has third-order nonlinearity and optical rotation dispersion characteristics, and has the same polarization.
The reference light and control light with different wavelengths incident on the optical surface
Polarization of reference light and control light due to optical rotation dispersion of optical materials
By generating an angle between the surfaces, the third-order nonlinear optical effect
A nonlinear optical element characterized in that a change in refractive index caused by the change is extracted as a change in polarization of reference light .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03327893A JP3214129B2 (en) | 1992-03-03 | 1993-02-23 | Nonlinear optical element |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8029292 | 1992-03-03 | ||
| JP4-80292 | 1992-03-03 | ||
| JP03327893A JP3214129B2 (en) | 1992-03-03 | 1993-02-23 | Nonlinear optical element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05307202A JPH05307202A (en) | 1993-11-19 |
| JP3214129B2 true JP3214129B2 (en) | 2001-10-02 |
Family
ID=26371954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03327893A Expired - Fee Related JP3214129B2 (en) | 1992-03-03 | 1993-02-23 | Nonlinear optical element |
Country Status (1)
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| JP4328724B2 (en) | 2005-01-17 | 2009-09-09 | 富士通株式会社 | Optical waveform measuring apparatus and optical waveform measuring method |
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1993
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| １９９１年（平成３年）秋季第５２回応用物理学会学術講演会予稿集第３分冊 ｐｐ．１１２６（講演番号１１ｐ−Ｔ−７）横沢伊裕 他 |
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