JP3269168B2 - Amplitude and phase modulator - Google Patents

Amplitude and phase modulator

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Publication number
JP3269168B2
JP3269168B2 JP07242493A JP7242493A JP3269168B2 JP 3269168 B2 JP3269168 B2 JP 3269168B2 JP 07242493 A JP07242493 A JP 07242493A JP 7242493 A JP7242493 A JP 7242493A JP 3269168 B2 JP3269168 B2 JP 3269168B2
Authority
JP
Japan
Prior art keywords
liquid crystal
phase
amplitude
light
modulator
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.)
Expired - Fee Related
Application number
JP07242493A
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Japanese (ja)
Other versions
JPH06289353A (en
Inventor
弘綱 三浦
淳 尼子
富雄 曽根原
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Seiko Epson Corp
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Seiko Epson Corp
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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は光の振幅を変調する液晶
空間光変調器および光の振幅と位相を独立に変調する振
幅位相変調器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal spatial light modulator for modulating light amplitude and an amplitude / phase modulator for independently modulating light amplitude and phase.

【0002】[0002]

【従来の技術】従来の液晶空間光変調器は光の振幅を変
調する際、光の位相も変化させるものであった。
2. Description of the Related Art A conventional liquid crystal spatial light modulator changes the phase of light when modulating the amplitude of light.

【0003】[0003]

【発明が解決しようとする課題】しかし、従来の液晶空
間光変調器はこれを波面制御や光シャッターに応用しよ
うとしても位相歪のためにうまく利用できないという問
題があった。また従来の液晶空間光変調器を用いた従来
の振幅位相変調器は振幅と位相を完全には光の振幅と位
相を独立に変調できないという問題があった。本発明
は、このような問題点を解決するものであって、その目
的は、簡便な手段により高性能な振幅位相変調器を提供
するところにある。
However, there is a problem that the conventional liquid crystal spatial light modulator cannot be used well due to phase distortion even if it is applied to wavefront control or optical shutter. Further, the conventional amplitude and phase modulator using the conventional liquid crystal spatial light modulator has a problem that the amplitude and the phase cannot be completely modulated independently of the light. The present invention has been made to solve such a problem, and an object of the present invention is to provide a high-performance amplitude / phase modulator by simple means.

【0004】[0004]

【課題を解決するための手段】本発明の振幅位相変調器
は、光の振幅及び位相を変調する振幅位相変調器におい
て、ホモジニアス配向した液晶を含み、且つ電界制御複
屈折モードである位相変調手段、ねじれ配向した液晶
と、前記液晶に揃って配向した2色性色素と、を含む振
幅変調手段、及び前記振幅変調手段の光入射側に設けら
れた偏光板を具備し、前記偏光板の透過軸と、前記位相
変調手段の液晶のダイレクタ方向と、が平行であり、前
記位相変調手段の液晶のダイレクタ方向と、前記振幅変
調手段の光入射側に位置する液晶のダイレクタ方向と、
が直交することを特徴とする。
SUMMARY OF THE INVENTION An amplitude-phase modulator according to the present invention is an amplitude-phase modulator for modulating the amplitude and phase of light.
Containing a homogeneously aligned liquid crystal and
Phase modulation means in refraction mode, twisted liquid crystal
And a dichroic dye aligned with the liquid crystal.
A width modulation unit, and a light modulation unit provided on the light incident side of the amplitude modulation unit.
The polarizing plate, the transmission axis of the polarizing plate, the phase
The director direction of the liquid crystal of the modulating means is parallel and
The liquid crystal director direction of the phase modulation means and the amplitude change
Director direction of the liquid crystal positioned on the light incident side of the adjusting means,
Are orthogonal to each other.

【0005】[0005]

【実施例】以下、本発明の参考例としての液晶空間光変
調器の詳細を示す。参考例) 図1に本発明の液晶空間光変調器の構成を示す。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal spatial light modulator as a reference example of the present invention will be described.
The details of the controller are shown. ( Reference Example ) FIG. 1 shows a configuration of a liquid crystal spatial light modulator of the present invention.

【0006】TNモードの液晶空間光変調器の液晶層1
05に2色性色素107を加えた。この液晶に添加され
た色素は液晶ダイレクタ106に沿って配向する。
Liquid crystal layer 1 of TN mode liquid crystal spatial light modulator
05 was added with dichroic dye 107. The dye added to the liquid crystal is aligned along the liquid crystal director 106.

【0007】入射側の偏光板103の透過軸110をT
Nモードの液晶空間光変調器の入射側の配向方向と直交
させた。
The transmission axis 110 of the polarizing plate 103 on the incident side is set to T
The direction was perpendicular to the alignment direction on the incident side of the N-mode liquid crystal spatial light modulator.

【0008】本実施例では出射側の偏光板109は入射
偏光板と透過軸が平行になるように配置した。
In this embodiment, the exit-side polarizing plate 109 is arranged so that the transmission axis is parallel to the incident polarizing plate.

【0009】従来のTNモードの液晶空間光変調器では
印加電圧を変えると透過率だけでなく光の位相も変化さ
せる。これを説明する。
In a conventional TN mode liquid crystal spatial light modulator, changing the applied voltage changes not only the transmittance but also the phase of light. This will be described.

【0010】電圧印加時には図2のように液晶ダイレク
タ204が入射光の偏光方向202に対して垂直になる
ので、どのような偏光も常屈折率のみを感じ、出射光の
位相は一定である。
When a voltage is applied, the liquid crystal director 204 is perpendicular to the polarization direction 202 of the incident light as shown in FIG. 2, so that any polarized light has only the ordinary refractive index and the phase of the emitted light is constant.

【0011】ところが電圧無印加時にはどのような偏光
に対しても電圧印加時に比べて位相がずれる。
However, when no voltage is applied, the phase of any polarized light is shifted as compared with when a voltage is applied.

【0012】図3に従来のTNモードの液晶空間光変調
器で位相変化が起こる原理を示す。偏光板を透過した光
302は図3(a)のようにTNモードの液晶空間光変
調器の入射面の液晶ダイレクタ301に垂直な方向に偏
光している。すなわちこの光は常光である。
FIG. 3 shows the principle that a phase change occurs in a conventional TN mode liquid crystal spatial light modulator. The light 302 transmitted through the polarizing plate is polarized in a direction perpendicular to the liquid crystal director 301 on the incident surface of the TN mode liquid crystal spatial light modulator as shown in FIG. That is, this light is ordinary light.

【0013】ところがTNセルでは液晶がねじれて配向
されているのでこの光302に対して液晶ダイレクタが
傾いていく。このため図3(b)のように、常光成分3
04の他に異常光成分305があらわれる。この異常光
は常光に対して位相がずれている。
However, in the TN cell, the liquid crystal is twisted and oriented, so that the liquid crystal director tilts with respect to the light 302. Therefore, as shown in FIG.
04, an extraordinary light component 305 appears. This extraordinary light is out of phase with the ordinary light.

【0014】更に光が進むと更に液晶ダイレクタが傾
き、図3(c)のように、常光成分304からは常光成
分307と異常光成分308、図3(d)のように、異
常光成分305からは常光成分309と異常光成分31
0があらわれる。
As the light further travels, the liquid crystal director tilts further, and as shown in FIG. 3C, the ordinary light component 307 and the extraordinary light component 308 are converted from the ordinary light component 304, and as shown in FIG. From the ordinary light component 309 and the extraordinary light component 31
0 appears.

【0015】もともと異常光成分305は常光成分30
4と位相がずれていたので、常光成分307と309も
位相がずれている。
The extraordinary light component 305 is originally the ordinary light component 30
4, the ordinary light components 307 and 309 are also out of phase.

【0016】このようにして次々に位相のずれた光が重
なってくるので、出射光の位相は常屈折率のみを感じた
場合に比べてずれている。
As described above, since the lights whose phases are shifted one after another overlap, the phase of the emitted light is shifted as compared with the case where only the ordinary refractive index is felt.

【0017】以上は常光を入射した場合であるが、はじ
めから異常光の成分を含んでいれば位相が変化するのは
上の説明からも明らかであろう。
The above description is for the case where ordinary light is incident. It will be apparent from the above description that the phase changes if an extraordinary light component is included from the beginning.

【0018】従来のTNセルではこの位相変化は8分の
1波長から波長程度の大きさになる。
In a conventional TN cell, this phase change becomes as large as 1/8 wavelength to about wavelength.

【0019】一方、本発明の液晶空間光変調器では、印
加電圧を変えても光の位相を変化させない。
On the other hand, in the liquid crystal spatial light modulator of the present invention, the phase of light does not change even when the applied voltage is changed.

【0020】まず、電圧印加時には図4のように液晶ダ
イレクタ404が入射光の偏光方向に対して垂直になる
ので、入射光は常屈折率のみを感じる。このとき2色性
色素407も液晶と一緒に配向するが、位相変化も与え
ないし、光を吸収することもない。
First, when a voltage is applied, the liquid crystal director 404 is perpendicular to the polarization direction of the incident light as shown in FIG. 4, so that the incident light feels only the ordinary refractive index. At this time, the dichroic dye 407 also aligns with the liquid crystal, but does not change the phase and does not absorb light.

【0021】電圧無印加時には、液晶を透過して現れた
異常光は直ちに2色性色素によって吸収される。このた
め従来のTNモードの液晶空間光変調器のように常光に
位相のずれた成分が重なるというようなことがなく、出
射光は常屈折率のみを感じた場合(電圧印加時)と同じ
位相で出射される。
When no voltage is applied, the extraordinary light that appears through the liquid crystal is immediately absorbed by the dichroic dye. Therefore, unlike the conventional TN mode liquid crystal spatial light modulator, the component having a phase shift does not overlap with the ordinary light, and the emitted light has the same phase as that in the case where only the ordinary refractive index is felt (when voltage is applied). Is emitted.

【0022】すなわち本参考例のTNモードの液晶空間
光変調器では位相変化を伴わずに光の振幅のみを変化さ
せることができる。
That is, in the TN mode liquid crystal spatial light modulator of the present embodiment , only the amplitude of light can be changed without a phase change.

【0023】本参考例では、偏光板の配置は平行ニコル
(電圧無印加時に消光状態となるノーマリーブラック)
であり、染料の吸収によってコントラスト比も向上す
る。直交ニコルの場合でも入射側の偏光板が本発明の配
置であれば光の位相は変化しない。
In this embodiment , the polarizing plate is arranged in a parallel Nicol state (normally black, which is in an extinction state when no voltage is applied).
The contrast ratio is also improved by the absorption of the dye. Even in the case of orthogonal Nicols, the phase of light does not change if the incident side polarizing plate is arranged according to the present invention.

【0024】なお、本参考例では2色性色素として三井
東圧染料(株)製のS−344を使用した。
In the present embodiment , S-344 manufactured by Mitsui Toatsu Dye Co., Ltd. was used as the dichroic dye.

【0025】本参考例のTNモードの液晶空間光変調器
をローマン(Lohmann)型やリー(Lee)型の
ような振幅ホログラムの記録に利用すれば位相歪のない
良好な再生像が得られる。
If the TN mode liquid crystal spatial light modulator of this embodiment is used for recording an amplitude hologram such as a Lohmann type or a Lee type, a good reproduced image without phase distortion can be obtained.

【0026】また、本参考例のTNモードの液晶空間光
変調器を用いると波面を乱さない液晶シャッターが実現
する。これは各種情報処理や画像処理に応用できる。 (実施例) 図5に実施例に係る振幅位相変調器の構成を示す。
When the TN mode liquid crystal spatial light modulator of this embodiment is used, a liquid crystal shutter which does not disturb the wavefront is realized. This can be applied to various information processing and image processing. Shows the structure of (Example) amplitude and phase modulator according to the embodiment in FIG.

【0027】本発明の振幅位相変調器は実施例1のTN
モードの液晶空間光変調器503とホモジニアス配向型
ECB(電界制御複屈折)モードの液晶空間光変調器5
02を画素を揃えてはりあわせたものである。
The amplitude and phase modulator according to the present invention employs the TN
Mode liquid crystal spatial light modulator 503 and homogeneous alignment type ECB (electric field controlled birefringence) mode liquid crystal spatial light modulator 5
02 is obtained by aligning the pixels.

【0028】ECBモードの液晶空間光変調器は理想的
には光の振幅を変化させることなく位相を変調できる。
しかし実際には図6に示すような透過率変化をおこす場
合がある。
An ECB mode liquid crystal spatial light modulator can ideally modulate the phase without changing the amplitude of light.
However, the transmittance may actually change as shown in FIG.

【0029】本実施例の振幅位相変調器はこのようなE
CBモードの液晶空間光変調器を用いても光の振幅と位
相を独立に変調することを可能にするものである。
The amplitude and phase modulator of the present embodiment has such an E
Even if a CB mode liquid crystal spatial light modulator is used, the amplitude and phase of light can be independently modulated.

【0030】図7に本実施例の振幅位相変調器の液晶ダ
イレクタと偏光板の配置を示す。本実施例の振幅位相変
調器はECBモードの液晶空間光変調器を光の入射側に
配置する。入射側の偏光板703は透過軸710がEC
Bモードの液晶空間光変調器の液晶ダイレクタ704に
平行になるようにする。入射光はECBモードの液晶空
間光変調器によって位相変調をうける。このとき偏光状
態は変化しない。従って、TNモードの液晶空間光変調
器に入射するときも直線偏光のままである。
FIG. 7 shows the arrangement of the liquid crystal director and the polarizing plate of the amplitude and phase modulator of the present embodiment . In the amplitude and phase modulator according to the present embodiment, an ECB mode liquid crystal spatial light modulator is arranged on the light incident side. The transmission axis 710 of the polarizing plate 703 on the incident side is EC
The liquid crystal is set to be parallel to the liquid crystal director 704 of the B mode liquid crystal spatial light modulator. The incident light undergoes phase modulation by an ECB mode liquid crystal spatial light modulator. At this time, the polarization state does not change. Therefore, even when the light enters the TN mode liquid crystal spatial light modulator, it remains linearly polarized.

【0031】TNモードの液晶空間光変調器の入射側の
液晶ダイレクタ106はこの偏光方向(すなわちECB
モードの液晶空間光変調器のダイレクタの方向)に直交
するようにしてある。このため参考例の場合と同様に、
入射光は位相変調を受けることなく振幅変調される。
The liquid crystal director 106 on the incident side of the TN mode liquid crystal spatial light modulator has this polarization direction (that is, ECB).
Mode (the direction of the director of the liquid crystal spatial light modulator). Therefore, as in the case of the reference example ,
The incident light is amplitude-modulated without undergoing phase modulation.

【0032】光の振幅と位相を独立に変調するために
は、振幅位相変調器に入力するデータを修正する。
In order to independently modulate the amplitude and phase of light, data input to the amplitude / phase modulator is modified.

【0033】液晶空間光変調器の駆動装置はあらかじめ
求めておいたECBモードの液晶空間光変調器の透過率
変化と位相変化を記憶している。
The driving device of the liquid crystal spatial light modulator stores a change in transmittance and a change in phase of the liquid crystal spatial light modulator in the ECB mode which have been obtained in advance.

【0034】この駆動装置は位相データを受け取ると、
記憶内容をもとに、透過率の補正量を求め、この透過率
に対応する駆動信号をTNモードの液晶空間光変調器に
入力する。
When the driving device receives the phase data,
A correction amount of the transmittance is obtained based on the stored contents, and a drive signal corresponding to the transmittance is input to a TN mode liquid crystal spatial light modulator.

【0035】これによって与えられた振幅・位相データ
どおりの正確な変調ができた。このため本実施例の振幅
位相変調器を3次元像再生に応用すると、ノイズの少な
い良好な再生像が得られた。またこの振幅位相変調器を
各種情報処理や画像処理、波面計測、波面補正などのあ
らゆる分野に応用できるようになった。
As a result, accurate modulation was performed according to the given amplitude / phase data. Therefore, when the amplitude and phase modulator of the present embodiment was applied to three-dimensional image reproduction, a good reproduced image with less noise was obtained. Further, the amplitude and phase modulator can be applied to various fields such as various information processing, image processing, wavefront measurement, and wavefront correction.

【0036】なお、本実施例では一体型の振幅位相変調
器について述べたが、この他にもアフォーカル光学系で
TNモードの液晶空間光変調器とECBモードの液晶空
間光変調器を接続するような構成も可能である。
In this embodiment, the integrated amplitude / phase modulator has been described. In addition, a TN mode liquid crystal spatial light modulator and an ECB mode liquid crystal spatial light modulator are connected by an afocal optical system. Such a configuration is also possible.

【0037】本実施例の振幅位相変調器は透過率変化を
起こすECBモードの液晶空間光変調器を用いても光の
振幅と位相を独立に変調することを可能にするため、素
子設計の自由度が向上する。
The amplitude and phase modulator of this embodiment can freely modulate the amplitude and phase of light even if an ECB mode liquid crystal spatial light modulator that causes a change in transmittance is used. The degree improves.

【0038】以上本発明の実施例について述べてきた
が、本発明はこのほかにも、広く表示装置などに応用が
可能である。
Although the embodiments of the present invention have been described above, the present invention can be widely applied to other display devices and the like.

【0039】[0039]

【発明の効果】本発明の振幅位相変調器によれば、ホモ
ジニアス配向型であるECBモードである位相変調手段
を有し、偏光板の透過軸と、位相変調手段の液晶のダイ
レクタ方向と、が平行であるので、偏光板を透過した光
の位相変調が可能となる。そして、ねじれ配向した液晶
に揃うように配向した2色性色素を含む振幅変調手段を
有し、その位相変調手段の液晶のダイレクタ方向と振幅
変調手段の光入射側に位置する液晶のダイレクタ方向
と、が直交するので、位相変調された光の位相を再び変
調することなく振幅変調することができる。
According to the amplitude phase modulator of the present invention according to the present invention, homo
Phase modulation means of an ECB mode of a genuine orientation type
Having a transmission axis of a polarizing plate and a liquid crystal die of a phase modulating means.
The light transmitted through the polarizing plate is parallel to the
Is possible. And the liquid crystal with twist alignment
Amplitude modulating means containing dichroic dyes aligned so that
And the director direction and amplitude of the liquid crystal of the phase modulating means
The director direction of the liquid crystal located on the light incident side of the modulation means
And are orthogonal, so the phase of the phase-modulated light is changed again.
The amplitude can be modulated without tuning.

【0040】すなわち、振幅変調と位相変調とが各々独That is, each of the amplitude modulation and the phase modulation is independent.
立して行われるので、振幅を調整するときは振幅変調手When adjusting the amplitude, use the amplitude modulation method.
段を、位相を変調するときは振幅変調手段を、各々制御Controls the stages and the amplitude modulation means when modulating the phase
すればよいので、高精度な光波面制御が可能となる。As a result, highly accurate light wavefront control can be performed.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 参考例に係る液晶空間光変調器の構成を示す
斜視図である。
FIG. 1 is a perspective view illustrating a configuration of a liquid crystal spatial light modulator according to a reference example .

【図2】 従来の液晶空間光変調器の電圧印加時の様子
を示す側面図である。
FIG. 2 is a side view showing a state when a voltage is applied to a conventional liquid crystal spatial light modulator.

【図3】 従来のTNモードの液晶空間光変調器で位相
変化が起こる原理を示す図である。
FIG. 3 is a diagram showing a principle of a phase change occurring in a conventional TN mode liquid crystal spatial light modulator.

【図4】 本発明の参考例に係る液晶空間光変調器の電
圧印加時の様子を示す側面図である。
FIG. 4 is a side view showing a state when a voltage is applied to a liquid crystal spatial light modulator according to a reference example of the present invention .

【図5】 本発明の実施例に係る振幅位相変調器の構成
を示す側面図である。
FIG. 5 is a side view showing a configuration of the amplitude and phase modulator according to the embodiment of the present invention .

【図6】 本発明の実施例に係るECBモードの液晶空
間光変調器の振幅および位相変調特性を示す図である。
FIG. 6 is a diagram showing amplitude and phase modulation characteristics of an ECB mode liquid crystal spatial light modulator according to an embodiment of the present invention .

【図7】 本発明の実施例に係る振幅位相変調器の構成
を示す斜視図である。
FIG. 7 is a perspective view illustrating a configuration of an amplitude and phase modulator according to an embodiment of the present invention .

【符号の説明】[Explanation of symbols]

101 入射側偏光板の透過軸に垂直な偏光成分 102 入射側偏光板の透過軸に平行な偏光成分 103 入射側の偏光板 104 偏光板を透過した光 105 液晶層 106 液晶ダイレクタ 107 2色性色素 108 液晶によって変調された光 109 出射側の偏光板 110 偏光板の透過軸 201 偏光板 202 入射光の偏光方向 203 電極 204 液晶ダイレクタ 205 電極 206 偏光板 301 入射面の液晶ダイレクタ 302 偏光板を透過した光 303 液晶ダイレクタ 304 常光成分 305 異常光成分 306 液晶ダイレクタ 307 常光成分 308 異常光成分 309 常光成分 310 異常光成分 401 偏光板 402 入射光の偏光方向 403 電極 404 液晶ダイレクタ 405 電極 406 偏光板 407 2色性色素 501 偏光板 502 TNモードの液晶空間光変調器 503 ECBモードの液晶空間光変調器 504 偏光板 701 入射側偏光板の透過軸に垂直な偏光成分 702 入射側偏光板の透過軸に平行な偏光成分 703 入射側の偏光板 704 液晶ダイレクタ 708 液晶によって変調された光 709 出射側の偏光板 710 偏光板の透過軸 101 Polarization component perpendicular to the transmission axis of the incident-side polarizing plate 102 Polarization component parallel to the transmission axis of the incident-side polarizing plate 103 Incident-side polarizing plate 104 Light transmitted through the polarizing plate 105 Liquid crystal layer 106 Liquid crystal director 107 Dichroic dye 108 light modulated by liquid crystal 109 outgoing side polarizer 110 transmission axis of polarizer 201 polarizer 202 polarization direction of incident light 203 electrode 204 liquid crystal director 205 electrode 206 polarizer 301 liquid crystal director 302 on incident surface transmitted through polarizer Light 303 liquid crystal director 304 ordinary light component 305 extraordinary light component 306 liquid crystal director 307 ordinary light component 308 extraordinary light component 309 ordinary light component 310 extraordinary light component 401 polarizing plate 402 polarization direction of incident light 403 electrode 404 liquid crystal director 405 electrode 406 polarizing plate 407 2 colors Sex dye 501 Polarizing plate 502 TN mode liquid crystal spatial light modulator 503 ECB mode liquid crystal spatial light modulator 504 Polarizing plate 701 Polarized component perpendicular to transmission axis of incident side polarizing plate 702 Polarized component parallel to transmission axis of incident side polarizing plate 703 Incident side polarizing plate 704 Liquid crystal director 708 Light modulated by liquid crystal 709 Outgoing side polarizing plate 710 Transmission axis of polarizing plate

フロントページの続き (56)参考文献 特開 平4−226426(JP,A) 特開 昭62−89027(JP,A) 特開 昭58−224332(JP,A) 特開 昭58−70213(JP,A) 特開 平4−204828(JP,A) 特開 平4−158332(JP,A) 特開 平4−293013(JP,A) 特開 平5−66377(JP,A) (58)調査した分野(Int.Cl.7,DB名) G02F 1/13 G02F 1/1347 G02F 1/137 Continuation of front page (56) References JP-A-4-226426 (JP, A) JP-A-62-89027 (JP, A) JP-A-58-224332 (JP, A) JP-A-58-70213 (JP, A) JP-A-4-204828 (JP, A) JP-A-4-158332 (JP, A) JP-A-4-29313 (JP, A) JP-A-5-66377 (JP, A) (58) Field surveyed (Int.Cl. 7 , DB name) G02F 1/13 G02F 1/1347 G02F 1/137

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】光の振幅及び位相を変調する振幅位相変調
器において、 ホモジニアス配向した液晶を含み、且つ電界制御複屈折
モードである位相変調手段、 ねじれ配向した液晶と、前記液晶に揃って配向した2色
性色素と、を含む振幅変調手段、及び前記振幅変調手段
の光入射側に設けられた偏光板を具備し、 前記偏光板の透過軸と、前記位相変調手段の液晶のダイ
レクタ方向と、が平行であり、 前記位相変調手段の液晶のダイレクタ方向と、前記振幅
変調手段の光入射側に位置する液晶のダイレクタ方向
と、が直交することを特徴とする振幅位相変調器。
An amplitude and phase modulation for modulating the amplitude and phase of light.
, Containing homogeneously aligned liquid crystal and electric field controlled birefringence
Mode modulating means, twisted liquid crystal, and two colors aligned with the liquid crystal
Amplitude modulating means including a sex dye, and the amplitude modulating means
And a transmission axis of the polarizing plate and a liquid crystal die of the phase modulating means.
The direction of the liquid crystal of the phase modulating means and the amplitude
The director direction of the liquid crystal located on the light incident side of the modulation means
And an orthogonal phase modulator.
JP07242493A 1993-03-30 1993-03-30 Amplitude and phase modulator Expired - Fee Related JP3269168B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP07242493A JP3269168B2 (en) 1993-03-30 1993-03-30 Amplitude and phase modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP07242493A JP3269168B2 (en) 1993-03-30 1993-03-30 Amplitude and phase modulator

Publications (2)

Publication Number Publication Date
JPH06289353A JPH06289353A (en) 1994-10-18
JP3269168B2 true JP3269168B2 (en) 2002-03-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3269168B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007028371B4 (en) * 2007-06-13 2012-05-16 Seereal Technologies S.A. Device for light modulation
US10248081B2 (en) 2017-03-10 2019-04-02 Microsoft Technology Licensing, Llc Holographic phase and amplitude spatial light modulation

Also Published As

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JPH06289353A (en) 1994-10-18

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