JPH01200235A - Nonlinear optical element - Google Patents
Nonlinear optical elementInfo
- Publication number
- JPH01200235A JPH01200235A JP2547288A JP2547288A JPH01200235A JP H01200235 A JPH01200235 A JP H01200235A JP 2547288 A JP2547288 A JP 2547288A JP 2547288 A JP2547288 A JP 2547288A JP H01200235 A JPH01200235 A JP H01200235A
- Authority
- JP
- Japan
- Prior art keywords
- mnba
- nonlinear optical
- crystal
- waveguide
- obtd
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 56
- 239000013078 crystal Substances 0.000 claims abstract description 51
- 238000003776 cleavage reaction Methods 0.000 claims abstract description 7
- 230000007017 scission Effects 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- YEKPNMQQSPHKBP-UHFFFAOYSA-N 2-methyl-6-nitrobenzoic anhydride Chemical compound CC1=CC=CC([N+]([O-])=O)=C1C(=O)OC(=O)C1=C(C)C=CC=C1[N+]([O-])=O YEKPNMQQSPHKBP-UHFFFAOYSA-N 0.000 abstract description 29
- 238000000034 method Methods 0.000 abstract description 18
- 239000011521 glass Substances 0.000 abstract description 10
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 abstract description 9
- 238000002425 crystallisation Methods 0.000 abstract description 6
- 230000008025 crystallization Effects 0.000 abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000843 powder Substances 0.000 abstract description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000011368 organic material Substances 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000010884 ion-beam technique Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000005297 pyrex Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- XTTIQGSLJBWVIV-UHFFFAOYSA-N 2-methyl-4-nitroaniline Chemical compound CC1=CC([N+]([O-])=O)=CC=C1N XTTIQGSLJBWVIV-UHFFFAOYSA-N 0.000 description 1
- 239000004819 Drying adhesive Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- HVVNJUAVDAZWCB-YFKPBYRVSA-N [(2s)-pyrrolidin-2-yl]methanol Chemical compound OC[C@@H]1CCCN1 HVVNJUAVDAZWCB-YFKPBYRVSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011549 crystallization solution Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- NHHJPLIBPNEMHJ-UHFFFAOYSA-N n-(5-amino-2-methoxyphenyl)acetamide Chemical compound COC1=CC=C(N)C=C1NC(C)=O NHHJPLIBPNEMHJ-UHFFFAOYSA-N 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/361—Organic materials
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は非線形光学素子、詳しくは、非線形光学材料と
して４′−二トロペンジリデンアニリン−３−アセトア
ミノ−４−メトキシアニリン（以下ＭＮＢＡと略す）を
用いた導波路形の非線形光学素子に関するものである。Detailed Description of the Invention [Industrial Application Field] The present invention relates to a nonlinear optical element, and more particularly, to a nonlinear optical material that uses 4'-nitropenzylideneaniline-3-acetamino-4-methoxyaniline (hereinafter abbreviated as MNBA). ) is related to a waveguide-type nonlinear optical element using.
［従来の技術］
非線形光学効果を応用した素子として、第２高調波発生
（以下ＳＨＧと略す）によってレーザ光の波長を１７２
に変換するＳＨＧ素子や、パラメトリック発振によって
レーザ光の波長を連続的に変換するパラメトリック発振
器、などの波長変換素子、電気光学効果を用いた光スィ
ッチや光変調素子、光双安定素子などが提案されてきた
。[Prior art] As an element that applies nonlinear optical effects, the wavelength of laser light is increased to 172 by second harmonic generation (hereinafter abbreviated as SHG).
Wavelength conversion devices such as SHG devices that convert laser light into wavelengths, parametric oscillators that continuously convert the wavelength of laser light through parametric oscillation, optical switches and optical modulation devices that use electro-optic effects, and optical bistable devices have been proposed. It's here.
非線形光学効果の大きさは、非線形光学材料の非線形光
学定数の大きさだけでなく、レーザ光のパワー密度が高
いほど大きくなるので、従来がら、これらの素子を導波
路形にしてレーザ光を狭い領域に閉じこめてパワー密度
を高めることが試みられてきた。さらに、バルクな結晶
中では位相不整合であるため、効率良く非線形光学効果
を発現できないような材料でも、導波路構造にすれば位
相整合可能になることも良く知られており（伊東ら、電
子通信学会論文誌、’ ８７／２、ＶＯｌ 、 Ｊ７０
−Ｃ，２２４頁）、導波路形の非線形光学素子の実現が
広く模索されている。このような試みの結果として、Ｌ
ｉＮｂＯ３の平板中に導波路を形成してＳＨＧ索子とし
た例が良く知られている（特開昭６０−５７８２５号公
報、同６０−１１２０２号公報など〉。The size of the nonlinear optical effect depends not only on the size of the nonlinear optical constant of the nonlinear optical material, but also as the power density of the laser beam increases. Attempts have been made to increase the power density by confining it within a region. Furthermore, it is well known that even materials that cannot efficiently produce nonlinear optical effects due to phase mismatching in bulk crystals can be made phase-matched by creating a waveguide structure (Ito et al., Journal of the Communication Society, '87/2, VOl, J70
-C, p. 224), the realization of waveguide-type nonlinear optical elements is being widely sought. As a result of such attempts, L
It is well known that a waveguide is formed in a flat plate of iNbO3 to form an SHG cable (JP-A-60-57825, JP-A-60-11202, etc.).
一方、非線形光学効果が大きな材料として、２−メチル
−４−ニトロアニリン、Ｎ−（４−ニトロフェニル）−
（Ｌ）−プロリノール、などの有機材料が良く知られて
おり、これらの有機材料を用いた導波井形非線形光学素
子の実現も試みられている（Ｄ、 Ｊ、 Ｗｉｌｌｉａ
ｍｓ編； ｒＮＯｎｌｉｎｅａｒＯｐｔｉｃａｌ Ｐ
ｒｏｐｅｒｔｉｅｓ ｏｆ Ｏｒｇａｎｉｃ ａｎｄ
ＰｏｌｙｍｅｒｉｃＭａｔｅｒｉａｌｓ Ｊ （ＡＣ
３ｓｙｍｐｏｓｉｕｍ ５ｉｒｉｅｓ Ｎｏ、２３３
））。On the other hand, 2-methyl-4-nitroaniline, N-(4-nitrophenyl)-
Organic materials such as (L)-prolinol are well known, and attempts have been made to realize waveguide-shaped nonlinear optical elements using these organic materials (D, J, William
ms edition; rNOnlinear Optical P
properties of organic and
Polymeric Materials J (AC
3symposium 5iries No, 233
)).
また、非線形光学効果を有する結晶を導波路層として用
いる導波路形の非線形光学素子の構成として、第４図に
示すように（第４図中、２は透明平板、１１は非線形光
学材料の導波路層を示す。）非線形光学材料そのものが
導波路層として機能する方式（特開昭６０−５７８２５
号公報、同６０−１１２０２３号公報など）と、第５図
に示すように（第５図中、１２は装荷層、７は導波路層
を示す。）、非線形光学効果を有していない通常の導波
路の上にトップ層として非線形光学材料が装荷され、通
常の導波路を導波してきた光が一旦非線形光学材料（装
荷層）に移って導波した後再び通常の導波路に戻るとい
う構成（Ｈ，ＩｔＯｈ、ら： Ａｐｐｌｉｅｄ ０ｐｔ
ｉｃｓ、 ＶＯｌ、２５．１４９１頁（１９８Ｂ） ）
の２つの方式が良く知られている。In addition, as a configuration of a waveguide-type nonlinear optical element using a crystal having a nonlinear optical effect as a waveguide layer, as shown in FIG. ) A method in which the nonlinear optical material itself functions as a waveguide layer (Japanese Patent Laid-Open No. 60-57825
As shown in FIG. 5 (in FIG. 5, 12 is a loaded layer and 7 is a waveguide layer), there are ordinary A nonlinear optical material is loaded as a top layer on top of the waveguide, and the light that has been guided through the normal waveguide is transferred to the nonlinear optical material (loaded layer) and guided, and then returns to the normal waveguide. Configuration (H, ItOh, et al: Applied 0pt
ics, VOl, 25.1491 pages (198B))
Two methods are well known.
［発明が解決しようとする課題］
しかしながら、かかる従来の技術においては、次のよう
な欠点があった。[Problems to be Solved by the Invention] However, such conventional technology has the following drawbacks.
■ 有機材料は非線形光学効果が無機材料に比べて桁ち
がいに大きいものが多く見出だされているのにもかかわ
らず、導波路化するために必要な大きなサイズの結晶が
得にくい。■ Despite the fact that many organic materials have been found to have an order of magnitude greater nonlinear optical effect than inorganic materials, it is difficult to obtain the large-sized crystals needed to form waveguides.
■ 第４図、第５図に示すいずれの方式においても、非
線形光学結晶が接する面は波長以下の精度で平滑でない
と、散乱による導波損失が大きくなって効率の良い非線
形光学効果を発現できない。■ In both of the systems shown in Figures 4 and 5, if the surface in contact with the nonlinear optical crystal is not smooth with an accuracy below the wavelength, the waveguide loss due to scattering will increase and an efficient nonlinear optical effect cannot be achieved. .
しかし、一般に有機結晶には脆いものが多く、研磨など
の加工が困難であるという問題点があった。However, there is a problem in that many organic crystals are generally brittle and processing such as polishing is difficult.
さらに、導波路として満足できる非線形結晶膜を得ても
、最大の非線形光学効果を有効に利用するためには結晶
の方位を選ばなければならない。言いかえれば、結晶が
持っている非線形光学効果を有効にひきだすことができ
るように結晶面を選んで加工しなければならないが、こ
のような結晶面制御が困難である（ Ｓ、Ｔｏｍａｒｕ
、ら；０ｐｔｉｃｓ Ｃｏｍｍｕｎｉｃａｔｉｏｎ、ｖ
ｏｌ、 ５０．１５１頁、（１９８４） ）。Furthermore, even if a nonlinear crystal film that is satisfactory as a waveguide is obtained, the orientation of the crystal must be selected in order to effectively utilize the maximum nonlinear optical effect. In other words, the crystal plane must be selected and processed in such a way that the nonlinear optical effect of the crystal can be effectively brought out, but such crystal plane control is difficult (S, Tomaru
, et al;0ptics Communication, v
ol, p. 50.151, (1984)).
本発明の課題は、非線形光学効果が大きく、結晶化が容
易で、かつ加工性にすぐれた有機材料を用い、特にその
材料の非線形光学効果を最大に発現させるように加工し
た導波路形の非線形光学素子を提供することである。The object of the present invention is to create a waveguide-shaped nonlinear waveguide that uses an organic material that has a large nonlinear optical effect, is easy to crystallize, and has excellent processability, and is particularly processed to maximize the nonlinear optical effect of the material. An object of the present invention is to provide an optical element.
［課題を解決するための手段］
上記目的を達成するために、本発明は、下記の構成か為
なる。[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration.
「非線形光学効果を有する結晶層と、該結晶層に接し、
かつ該結晶層よりも屈折率が低い透明基板層とを有する
導波井形非線形光学素子において、非線形光学効果を有
する結晶層が、（■）式で表される４′−二トロペンジ
リデンアニリン−３−アセトアミノ−４−メトキシアニ
リンのへき開面を有する結晶であることを特徴とする導
波井形非線形光学素子。"A crystal layer having a nonlinear optical effect, in contact with the crystal layer,
and a transparent substrate layer having a refractive index lower than that of the crystal layer, in which the crystal layer having a nonlinear optical effect is composed of 4'-nitropenzylideneaniline- expressed by the formula (■). A waveguide-shaped nonlinear optical element characterized by being a crystal having a cleavage plane of 3-acetamino-4-methoxyaniline.
」
すなわち、本発明は、非線形光学素子として八１ＮＢＡ
を用い、かつ、そのへき開面を利用することを特徴とす
る導波路形の非線形光学素子を提案している。” That is, the present invention uses 81NBA as a nonlinear optical element.
We have proposed a waveguide-type nonlinear optical element that uses the cleavage plane of the waveguide.
本発明にかかわるＭＮＢＡ結晶は、結晶解析の結果から
、単斜晶系（空間群ＣＣ）に属すことがわかった。また
、分子の配向から、非線形光学効果は、ａ軸およびａ軸
を含む面内で、ａ軸から約３０度傾いた方向で最大にな
ることがわかった。The MNBA crystal according to the present invention was found to belong to the monoclinic system (space group CC) from the results of crystal analysis. Furthermore, it was found from the orientation of molecules that the nonlinear optical effect is maximum in the a-axis and a direction tilted by about 30 degrees from the a-axis within a plane including the a-axis.
ＭＮＢＡ結晶を、乳鉢ですりつぶし、ふるいを通して粒
径が１５〜１５０μｍの範囲で分類したのち、非線形光
学効果の性能の測定法として良く知られている「粉末法
Ｊ （Ｓ、 Ｋ、 ＫＵｒｔＺら、ＪＯＩＪｒｎａｌ
ｏｆ Ａｐｐｌｉｅｄ Ｐｈｙｓｉｃｓ、 ｖｏｌ、
３９，３７９８． （１９６８）） ニ従って、ＹＡＧ
レーザ光を用いてＳ ｉ（Ｇ光強度を測定し、一般に標
準試料として用いられているウレアと比較したところ、
第３図に示すような結果を得な。第３図中、９はウレア
の測定曲線、１０はＭＮＢＡの測定曲線を示す。この結
果から、ＭＮＢＡが非常に大きな非線形光学効果を示す
ものの、バルクな結晶では位相不整合であることがわか
った。MNBA crystals were ground in a mortar, passed through a sieve, and classified into particles with a particle size in the range of 15 to 150 μm.
of Applied Physics, vol.
39,3798. (1968)) Therefore, YAG
When the Si(G light intensity was measured using a laser beam and compared with urea, which is generally used as a standard sample),
Obtain the results shown in Figure 3. In FIG. 3, reference numeral 9 indicates a measurement curve for urea, and reference numeral 10 indicates a measurement curve for MNBA. From this result, it was found that although MNBA exhibits a very large nonlinear optical effect, there is a phase mismatch in the bulk crystal.
ＭＮＢＡ結晶は、溶液からの結晶化法、融液からの結晶
化法など、よく知られている結晶化法によって大きな結
晶が容易に得られる。しかし、結晶化溶液の種類などの
結晶化条件を変えると、結晶方位によって成長速度が異
なり、得られる結晶の形状が異なってくる。しかも、従
来の結晶加工法によって切断研磨しても、結晶が脆いた
めに導波路化するための面出しが困難であった。Large crystals of MNBA can be easily obtained by well-known crystallization methods such as crystallization from a solution and crystallization from a melt. However, if the crystallization conditions such as the type of crystallization solution are changed, the growth rate will vary depending on the crystal orientation, and the shape of the resulting crystal will differ. Furthermore, even if the crystal is cut and polished using conventional crystal processing methods, it is difficult to surface the crystal to form a waveguide because the crystal is brittle.
しかし、結晶加工法および導波路化法を鋭意検討した結
果、以下のことを見出だしな。すなわち■結晶化条件の
違いによる結晶形状の違いに依存せずに、（１００）面
で大面積かつ平滑なへき開面が得られる。However, as a result of intensive study of crystal processing methods and waveguide formation methods, we discovered the following. That is, (1) a smooth cleavage plane with a large area can be obtained on the (100) plane without depending on differences in crystal shape due to differences in crystallization conditions.
■へき開面の平滑性を利用することにより、高度な切断
や研磨の技術を要せずに、導波路化することが可能にな
る。■By utilizing the smoothness of the cleavage plane, it becomes possible to create a waveguide without requiring sophisticated cutting or polishing techniques.
■（１００）面を導波路界面に選んで、この面に垂直な
偏光（ＴＭ波）を導波させれば、非線形光学効果が最大
になる方向から約３０度傾いた成分の効果、つまり最大
値の約８７％の効果をひき出すことができる。■ If the (100) plane is selected as the waveguide interface and polarized light (TM wave) perpendicular to this plane is guided, the effect of the component tilted approximately 30 degrees from the direction where the nonlinear optical effect is maximum, that is, the maximum It is possible to extract an effect of about 87% of the value.
本発明の非線形光学素子を実現するためには、（１）Ｍ
ＮＢＡ結晶を、それよりも屈折率が低い透明平板上に密
着させ、ＭＮＢＡを導波路層として用いる方法（第４図
に対応する）、あるいは、（２）ともに非線形光学特性
を持たない屈折率の異なる２層の透明材料より構成され
る導波路を作製してのち、ＭＮＢＡ結晶のへき開面を該
導波路上に密着させる方法（第５図に対応する）のいず
れの方法も可能である。（１）の方法による場合、Ｍ
Ｎ Ｂ Ａよりも屈折率が低い透明平板としては、ソー
ダガラス、パイレックスガラスなどの低屈折率ガ゛ラス
や、ポリカーホ゛ネーＩ・、ポリメチルメタクリレート
などの透明プラスチックが好ましいが、屈折率がＭＮＢ
Ａよりも低ければこれらに限定されるものではない。ま
た、Ｍ Ｎ Ｂ Ａを透明平板に密着させる方法として
は、イソプロピルアルコール、ローブチルアルコールな
どのようにＭＮＢＡに対してわずかに溶解性がある高級
アルコールを用いて密着面を湿潤させなのちＭＮＢＡと
透明平板とを圧着させる方法が好ましいが、速乾性の接
着剤を用いることなども可能である。（２）の方法で非
線形光学素子を作製する場合は、ともに非線形光学特性
を持なない屈折率の異なる２層の透明材料より構成され
る導波路をあらかじめ作製しておく必要がある。このよ
うな導波路の作製方法としては、ガラス板上に該ガラス
板よりも屈折率が高いポリマやそのようなポリマを母体
とする混合組成物をコーティングする方法、ガラス板上
に該ガラス板よりも屈折率が高いガラス材をスパッタリ
ングによって蒸着する方法、などのほが多くの作製方法
が知られていて、どの方法によって作製したものでも本
発明に適用できる。しかし、好ましくは、透明性や膜質
の点からポリマやガラスを導波路とする方法が良い。ま
た、ＭＮＢＡ結晶をこれらの導波路に密着させる方法と
しては、（１）の方法で述べたと同様の方法で実施する
ことが可能である。 本発明で得られる導波井形素子は
、ＳＨＧ素子、パラメトリック発振器などの波長変換素
子、電気光学効果を用いた光スィッチや光変調素子、あ
るいは光双安定素子などの非線形光学素子として用いる
ことが可能である。In order to realize the nonlinear optical element of the present invention, (1) M
A method in which an NBA crystal is closely attached to a transparent flat plate with a lower refractive index and MNBA is used as a waveguide layer (corresponding to Fig. 4), or (2) a method with a refractive index that does not have nonlinear optical properties. Any method (corresponding to FIG. 5) is possible, in which a waveguide composed of two different layers of transparent materials is fabricated, and then the cleavage plane of the MNBA crystal is brought into close contact with the waveguide (corresponding to FIG. 5). In the case of method (1), M
As a transparent flat plate with a refractive index lower than NBA, low refractive index glasses such as soda glass and Pyrex glass, and transparent plastics such as polycarbonate I and polymethyl methacrylate are preferable.
As long as it is lower than A, it is not limited to these. In addition, as a method for adhering MNBA to a transparent flat plate, the adhesion surface is moistened using a higher alcohol that is slightly soluble in MNBA, such as isopropyl alcohol or lobethyl alcohol, and then the MNBA and MNBA are bonded together. It is preferable to press the transparent flat plate, but it is also possible to use a quick-drying adhesive. When manufacturing a nonlinear optical element using the method (2), it is necessary to prepare in advance a waveguide made of two layers of transparent materials with different refractive indexes, both of which do not have nonlinear optical properties. Methods for producing such waveguides include coating a glass plate with a polymer having a higher refractive index than the glass plate or a mixed composition using such a polymer as a matrix; Many manufacturing methods are known, such as a method of vapor depositing a glass material with a high refractive index by sputtering, and any method of manufacturing can be applied to the present invention. However, from the viewpoint of transparency and film quality, it is preferable to use polymer or glass as the waveguide. Further, as a method for bringing the MNBA crystal into close contact with these waveguides, it is possible to carry out the same method as described in method (1). The waveguide rectangular element obtained by the present invention can be used as a nonlinear optical element such as an SHG element, a wavelength conversion element such as a parametric oscillator, an optical switch or optical modulation element using the electro-optic effect, or an optical bistable element. It is.
［実施例］
次に、本発明を実施例によってさらに具体的に説明する
が、本発明は、これらの実施例に限定されるものではな
い。[Examples] Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples.
実施例１
ＭＮＢＡ粉末５ｇを４００ ｍ ｌのアセトン中で熱時
溶解し、放置して室温まで冷却した後、２５℃の温度に
保ちながらアセトンをゆっくりと蒸発させた。こうして
１ケ月間静置したところ、すべてのアセトンが蒸発し、
最大Ｉ ＣｍＸ ５ｍｍｘ ６００μｍのＭＮＢＡ結晶
が得られた。偏光顕微跳上で観測したところ、この結晶
は単結晶であることかわかった。また、Ｘ線結晶解析に
よって、最大の面が（１００）面であることがわかった
。次に、この結晶を（１００）面でへき開し、良好な平
滑面を有する厚さ４００μｍの平板を得た。Example 1 5 g of MNBA powder was dissolved hot in 400 ml of acetone, allowed to cool to room temperature, and then the acetone was slowly evaporated while maintaining the temperature at 25°C. After leaving it for a month, all the acetone evaporated.
MNBA crystals with maximum I CmX 5 mm x 600 μm were obtained. Observation using a polarized light microscope revealed that this crystal was a single crystal. Furthermore, X-ray crystal analysis revealed that the largest plane was the (100) plane. Next, this crystal was cleaved along the (100) plane to obtain a flat plate with a thickness of 400 μm and a good smooth surface.
次いで、ポリカーボネート板上にインプロピルアルコー
ルを数滴たらして先のＭＮＢＡ板を圧着した。これを５
０°Ｃで３時間乾燥させて良好に密着された試料を得た
。さらに、ワイヤーソーて切断して、面サイズ３ｍｍＸ
５ｍｍにしたのち、ＭＮＢＡを（１００）面でへき開し
て膜厚を薄くした。Next, several drops of inpropyl alcohol were poured onto the polycarbonate plate, and the previous MNBA plate was crimped onto the polycarbonate plate. This is 5
A well-adhered sample was obtained by drying at 0°C for 3 hours. Furthermore, cut it with a wire saw to a surface size of 3mm
After reducing the thickness to 5 mm, the MNBA was cleaved along the (100) plane to reduce the film thickness.
そして、密着させたＭＮＢＡをさらにへき開して膜厚を
約５０μｍにした後、アルゴンプラズマを用いたイオン
ビームエツチングによってＭＮＢＡ結晶の膜厚が５μｍ
である第４図の形の導波井形素子を得た。結晶の平滑性
はイオンビームエツチングの前後で変化はなかった。After further cleaving the closely adhered MNBA to a film thickness of approximately 50 μm, ion beam etching using argon plasma was performed to reduce the film thickness of the MNBA crystal to 5 μm.
A waveguide rectangular element having the shape shown in FIG. 4 was obtained. The smoothness of the crystal did not change before and after ion beam etching.
この導波井形素子（・二尖頭出力］、ｋＷのパルス状Ｙ
ＡＧレーザ光を酸化チタンのプリズムによって導波路内
に結合して導波させたところ、第１図のようにチェレン
コフ位相整合によって発生したＳＭＣ光を観測した。第
１図中、１はＭＮＢＡの導波路層、３はプリズム、４は
ＹＡＧレーザ光、５はＳ ＨＧ光を示す。最大のＳＨＧ
変換効率は７×１０−２％だった。This waveguide well-shaped element (bi-peak output), kW pulse-shaped Y
When AG laser light was coupled into a waveguide using a titanium oxide prism and guided, SMC light generated by Cerenkov phase matching was observed as shown in FIG. In FIG. 1, 1 is an MNBA waveguide layer, 3 is a prism, 4 is a YAG laser beam, and 5 is an SHG light. largest SHG
Conversion efficiency was 7x10-2%.
実施例２
ポリメチルメタクリレ−＋−（６０重量部）、ペンシル
メタクリレート（２５重量部）、メチルメタクリレート
（１４重量部）、ヘンシルジメチルケタールく１−重量
部）を塩化メチレン中で溶解した溶液を、デイツプ法に
よってパイレックスカラス板上に塗布しテーパ状の膜厚
勾配を有する塗膜を得た。さらに、この塗膜を乾燥させ
たのち、真空下で超高圧水銀燈で３分間露光して、非線
形光学特性を持たない膜厚１．３μｍの光重合組成膜を
有するガラス板を得た。Example 2 A solution of polymethyl methacrylate (60 parts by weight), pencil methacrylate (25 parts by weight), methyl methacrylate (14 parts by weight), and 1 part by weight of hensyl dimethyl ketal in methylene chloride. was applied onto a Pyrex glass plate by the dip method to obtain a coating film with a tapered thickness gradient. Furthermore, after drying this coating film, it was exposed for 3 minutes with an ultra-high pressure mercury lamp under vacuum to obtain a glass plate having a photopolymerized composition film having a thickness of 1.3 μm and having no nonlinear optical properties.
次に、実施例１と同様の方法で得たＭＮ１３Ａを＜１０
０）面でへき開し、厚さ約２００μｍとしタモのを、そ
のへき開面にイソプロピルアルコールを数滴たらして湿
潤させてのち、先に述べた光重合組成膜にはりつけて乾
燥し、第５図の形の導波路素子を得た。Next, MN13A obtained in the same manner as in Example 1 was
After moistening the ash with a few drops of isopropyl alcohol on the cleaved surface to a thickness of about 200 μm, it was attached to the photopolymerizable composition film mentioned above and dried, as shown in Figure 5. A waveguide element of the form was obtained.
この導波井形素子に尖頭出力１ｋＷのパルス状ＹＡＧレ
ーザ光を酸化チタンのプリズムによって結合し、第２図
に示したように導波路素子をレーザ光の入射方向に対し
て垂直方向（導波路のテーパ方向）に移動してレーザ光
が見る導波路膜ＪＱを連続的に変化させて位相整合を試
みたところ、最も良好な位置でＳ ＨＧ変換効率が６Ｘ
ＩＯ−３％のＳＭＣ光を観測した。第２図中、６は、Ｍ
ＮＢＡ装荷膜、８は導波路のテーパ方向を示す。A pulsed YAG laser beam with a peak output of 1 kW is coupled to this waveguide element using a titanium oxide prism, and the waveguide element is connected in a direction perpendicular to the incident direction of the laser beam (waveguide When we attempted phase matching by moving the waveguide film JQ seen by the laser beam in the tapered direction), we found that the SHG conversion efficiency was 6X at the best position.
SMC light of IO-3% was observed. In Figure 2, 6 is M
NBA loaded film, 8 indicates the taper direction of the waveguide.
［発明の効果］
本発明によれば、ＭＮＩ３Ａが有している大きな非線形
光学効果を最大限ひきだすように結晶の方位を選び、か
つ、特殊な加工技術を要せずに良好な導波路素子を作製
することができる。[Effects of the Invention] According to the present invention, the orientation of the crystal is selected to maximize the large nonlinear optical effect that MNI3A has, and a good waveguide element can be manufactured without requiring special processing technology. It can be made.
第１図は、本発明実施例１の導波井形素子およびＳＭＣ
光を示す。
第２図は、本発明実施例２の導波井形素子およびＳＭＣ
光を示す。
第３図は、ＭＮＢＡとウレアとを粉末法で測定した結果
を示す。
第４図は、導波井形非線形光学素子の構成を示す。
第５図は、導波井形非線形光学素子の構成を示す。
１：ＭＮＢＡの導波路層 ２：透明平板 ３ニブリズム
４ ： ＹＡＧレーザ光 ５：５Ｉ−ＩＧ光６：ＭＮ
ＢＡ装荷膜 ７：導波路層 ８：導波路のテーパ方向
９：ウレアの測定値曲線 １０：ＭＮＢＡの測定値曲線
１１：非線形光学材料の導波路層 １２：非線形光学
材料の装荷膜特許出願人 東 し 株 式 会 社弔
１ 図
第２ 図
！：石晶材釆彷ヂ曇 （７βｍン
第３図
ｖＳヰ図 ・）５図FIG. 1 shows a waveguide rectangular element and an SMC of Example 1 of the present invention.
Show light. FIG. 2 shows a waveguide rectangular element and an SMC according to Example 2 of the present invention.
Show light. FIG. 3 shows the results of measuring MNBA and urea using a powder method. FIG. 4 shows the configuration of a waveguide rectangular nonlinear optical element. FIG. 5 shows the configuration of a waveguide rectangular nonlinear optical element. 1: MNBA waveguide layer 2: Transparent flat plate 3 Nibrism 4: YAG laser light 5: 5I-IG light 6: MN
BA loaded film 7: Waveguide layer 8: Waveguide taper direction
9: Measured value curve of urea 10: Measured value curve of MNBA 11: Waveguide layer of nonlinear optical material 12: Loaded film of nonlinear optical material Patent applicant Toshi Co., Ltd. 1 Figure 2! : Quartz crystal material (7βm Fig. 3 vs. Fig. ・) Fig. 5
Claims (1)
し、かつ該結晶層よりも屈折率が低い透明基板層とを有
する導波路形非線形光学素子において、非線形光学効果
を有する結晶層が、（ I ）式で表される４′−ニトロ
ベンジリデンアニリン−３−アセトアミノ−４−メトキ
シアニリンのへき開面を有する結晶であることを特徴と
する導波路形非線形光学素子。 ▲数式、化学式、表等があります▼（ I ）(1) In a waveguide type nonlinear optical element having a crystal layer having a nonlinear optical effect and a transparent substrate layer in contact with the crystal layer and having a lower refractive index than the crystal layer, the crystal layer having the nonlinear optical effect is , (I) A waveguide type nonlinear optical element characterized in that it is a crystal having a cleavage plane of 4'-nitrobenzylideneaniline-3-acetamino-4-methoxyaniline represented by formula (I). ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2547288A JPH01200235A (en) | 1988-02-04 | 1988-02-04 | Nonlinear optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2547288A JPH01200235A (en) | 1988-02-04 | 1988-02-04 | Nonlinear optical element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01200235A true JPH01200235A (en) | 1989-08-11 |
Family
ID=12166981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2547288A Pending JPH01200235A (en) | 1988-02-04 | 1988-02-04 | Nonlinear optical element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01200235A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991000544A1 (en) * | 1989-06-28 | 1991-01-10 | Toray Industries, Inc. | Quadratic nonlinear optical element |
| WO1991016658A1 (en) * | 1990-04-13 | 1991-10-31 | Toray Industries, Inc. | Laminated organic nonlinear optical crystal and production thereof |
| JPH03294827A (en) * | 1990-04-13 | 1991-12-26 | Toray Ind Inc | Lamination type organic nonlinear optical crystal body and production thereof |
-
1988
- 1988-02-04 JP JP2547288A patent/JPH01200235A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991000544A1 (en) * | 1989-06-28 | 1991-01-10 | Toray Industries, Inc. | Quadratic nonlinear optical element |
| WO1991016658A1 (en) * | 1990-04-13 | 1991-10-31 | Toray Industries, Inc. | Laminated organic nonlinear optical crystal and production thereof |
| JPH03294827A (en) * | 1990-04-13 | 1991-12-26 | Toray Ind Inc | Lamination type organic nonlinear optical crystal body and production thereof |
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