Modulation Bandwidth Control of Light Modulator and its Application

光调制器的调制带宽控制及其应用

• 批准号: 10650048
• 负责人: MORIMOTO Akihiro
• 金额: $ 2.11万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650048/
• 关键词: Light Modulator; Ultrafast; Domain Inversion; Bandwidth; LiTaO3; Phase Modulation; Sideband Generation; Femtosecond; 電気光学変調; 疑似速度整合; LiTaO_3; 非周期; 変調帯域; テラヘルツ

Periodic domain inversion of electrooptic crystals makes quasi-velocity-matching possible between light and microwave velocities in collinear microwave light modulator and provides large phase modulation index enough for generating femtosecond light pulses. In this research, we investigated the control of modulation bandwidth and band-shape by changing domain inversion pattern on the electrooptic phase modulator from simple periodic rectangles. We found some useful patterns of domain inversion that are suitable for wideband flat microwave modulation and an efficient modulator for specific two microwave frequencies by theoretical calculation. Domain inversion of electrooptic crystals was investigated for precise domain control. Charge control was quite important, so we employed current monitoring system for automatic domain control. We investigated novel domain pattern for ultrafast light control. We developed a diffractive optical modutator at a microwave frequency of which operation is similar to AOM. A guided wave modulator developed with domain inversion was suitable for ultrafast light pulse generation. All devices were optical sideband generators at microwave frequencies and the spectral control with dispersive devices makes ultrafast light pulse control possible.

电流晶体的周期域反转使得在线微波光调制器中的光和微波速度之间成为可能的准速度匹配，并提供足够的大相位调制指数，足以生成飞秒光脉冲。在这项研究中，我们通过简单周期性矩形的电磁相调制器上的域反转模式来调查调制带宽和带形的控制。我们发现了一些有用的域反转模式，这些模式适用于宽带平面微波调制和通过理论计算，适用于特定两个微波频率的有效调制器。研究了电晶体的域反转，以进行精确的域控制。电荷控制非常重要，因此我们采用了当前的监视系统来自动域控制。我们研究了超快光控制的新型域模式。我们以微波频率开发了一种衍射光学调节器，其操作与AOM相似。用域反转开发的引导波调节器适用于超快的光脉冲产生。所有设备都是微波频率处的光学边带发生器，带有色散设备的光谱控制使超快光脉冲控制成为可能。

项目成果

D.-S. Kim: "Ultrashort Optical Pulse Shaping by Electrooptic Synthesizer"IEICE Trans. Electron.. E81-C,2. 260-263 (1998)

D.-S。

A.Maruko: "Ultrafast Electrooptic Traveling Phase Grating with Periodic Domain Inversion" 1999 CRL Int'l Symp.on Optical Commun.and Sensing,Tokyo. C-7 (1999)

A.Maruko：“具有周期域反转的超快电光行相光栅”1999 CRL Intl Symp.on Optical Commun.and Sensing，东京。

T.Kobayashi and A.Morimoto: "Femtosecond Technology eds.T.Yajima, et al."Springer-Verlag. 1999.

T.Kobayashi 和 A.Morimoto：“飞秒技术 eds.T.Yajima 等人”Springer-Verlag。

森本朗裕: "レーザー工学,中井 編,第3章"オーム社. 250 (1999)

Akihiro Morimoto：“激光工程，Nakai 编辑，第 3 章”Ohmsha (1999)。

森本朗裕: "電気光学位相格子とその応用"輻射科学研究会資料. RS99-9. 1-16 (1999)

Akihiro Morimoto：“电光相位光栅及其应用”辐射科学研究组材料 RS99-9 (1999)。