Study on Generation oand Control of ultrashort Optical Pulses by Electrooptic Modulation.

电光调制超短光脉冲产生与控制的研究。

• 批准号: 09450031
• 负责人: KOBAYASHI Tetsuro
• 金额: $ 5.5万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450031/
• 关键词: Ultrashort optical pulses; femtosecond; Frequency chirping; Electrooptic modulation; terahertz; Broad optical sidebands; Electrooptic deflection; Electrooptic lens; 広帯域; 電気光学偏光

This study has been pursued to develop electro-optical ultrashort optical pulse generation method with high controllability. A main results obtained are as follows ;1) Design and improvement of an electrooptic phase modulator/deflector with high-modulation index using periodic domain inversion scheme.We succeeded in development of compact size waveguide-type quasi-velocity-matching electrooptic modulator with periodic domain inversion. Highly-efficient phase modulation as compared with a bulk-type one has been experimentally confirmed.2) Proposal of a novel QVM optical phase-modulator featuring lens modulation and its application to the electrooptic chirping compression method for pedestal free femtosecond optical pulse generation.Ordinary sinusoidal phase modulation generates both types of the frequency chirping ; up-chirping and down chirping. There was, therefore, a problem that although short optical pulses are obtained from one of chirping part by chirping compression method with the group delay dispersion, other chirping part still remains as background light. Our new modulator has lens modulation function as well as phase modulation function. Since modulated light beam is focused into the different point for the case of up-chirping and down-chirping, respectively, we can easily eliminate the undesirable chirping part by a pinhole. Using this modulator we succeeded in generation of pedestal free 520fs pulses from a cw Ar laser.3) Proposal and design of novel Fabry-Perot electrooptic modulator accompanied with lens modulation for femtosecond pulse generation. (Jpn Patent pending, H10-258293, CLEG '99 to be presented).

本研究旨在发展一种高可控性的电光超短光脉冲产生方法。取得的主要成果如下：1）利用周期畴反转技术设计和改进了高调制指数电光相位调制器/偏转器，成功地研制出了紧凑型波导型周期畴反转准速度匹配电光调制器。2）提出了一种新型的基于透镜调制的QVM光相位调制器，并将其应用于电光啁啾压缩方法中，产生无基座飞秒光脉冲。因此，存在这样的问题，即，虽然通过具有群延迟色散的啁啾压缩方法从啁啾部分之一获得短光脉冲，但是其他啁啾部分仍然保留为背景光。我们的新型调制器具有透镜调制功能以及相位调制功能。由于上啁啾和下啁啾的情况下，调制光束分别聚焦到不同的点，我们可以很容易地消除不希望的啁啾部分通过一个针孔。利用该调制器，我们成功地从连续Ar激光器中产生了520 fs的无基座脉冲。3）提出并设计了一种新型的带透镜调制的法布里-珀罗电光调制器，用于产生飞秒脉冲。(Jpn专利待审，H10-258293，CLEG '99待提交）。

项目成果

高原淳一他: "金属細線による光のガイド" 光学. 27・1. 29-30 (1998)

Junichi Takahara 等：“使用细金属线的光导”光学 27・1。

小林哲郎: "アレイ型光空間変調器" 特願平9-133441号. (1997)

小林哲郎：“阵列型光空间调制器”专利申请号9-133441（1997）。

J.Takahara, S.Yamagishi, H.Taki: "A.Morimoto, T.Kobayashi, Guiding of One-Dimensional Optical Beam with Nanometer Diameter" Opt.Lett.22-7. 475-477 (1997)

J.Takahara、S.Yamagishi、H.Taki：“A.Morimoto、T.Kobayashi，纳米直径一维光束的引导”Opt.Lett.22-7。

Patent, ((1997-1998))

专利，（（1997-1998））

Tattee Khayim et al.: "A Novel Fabry-Perot Modulator Using Electrooptic Lens for Ultrashort Optical Pulse Generation" Technical Digest of International Topical Workshop on Contemporary Photonic Technologies(CPT'99). Tu1-2. 17-18 (1999)

Tattee Khayim 等人：“A Novel Fabry-Perot Modulator using Electrooptic Lens for Ultrashort Optical Pulse Generation”当代光子技术国际专题研讨会（CPT99）技术文摘。