High Frequency (>lOGHz) Bragg-Diffraction-Type Electro-optic Deflectors Using Slant Periodic Domain Inversion.

使用倾斜周期域反转的高频（>10GHz）布拉格衍射型电光偏转器。

• 批准号: 14350187
• 负责人: KOBAYASHI Tetsuro
• 金额: $ 9.22万
• 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: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350187/
• 关键词: Ultrafast Control of Light; Light Deflector; Higher than 10GHz; Optical Frequency Shifter; Domain Inversion; Electrooptic Crystal; Bragg Diffraction; Raman-Nath Diffraction

The purpose of this study is to develop an optical high frequency (>10 GHz) shifter by improving the diffraction type of the traveling phase grating device, which was invented and has been studied by us, from the Raman-Nath type to the Bragg type. The qualitative improvement on our device operation has been achieved based on the narrow-width slant periodic domain inversion technique to an electrooptic (EO) crystal. The target devices will be useful for an optical microwave interface, optical WDM communication, and scientific and industrial measurements.The new frequency shifter is similar to an acoustooptic (AO) frequency shifter. However, it is possible to operate in the higher frequency range (>10GHz), where conventional AO device never operates.We designed and fabricated new frequency shifter by applying 20μm domain inversion technique to LiTaO_3 electro-optic crystal. The operation of the Bragg diffraction type frequency shifter with 16GHz frequency shift arid 82% conversion efficiency was experimentally confirmed for the first time. This result is to be published on IEEE Photonics Technology Letters.In addition, we proposed anew kind of ultrafast electrooptic deflector and flat-optical frequency comb generator utilizing transversal variation of the widths of reversed areas in periodic domain inversion. Both of new devices were designed and fabricated. It was confirmed experimentally that the new deflector has subpicosecond (<1ps) deflection speed and 32 resolvable spots and new comb generator can generate the widest flat sidebands (0.8THz -3 dB bandwidth) as an external phase modulation method.

本研究的目的是通过改进我们发明和研究的行相光栅器件的衍射类型，从拉曼-纳特型到布拉格型，开发一种光学高频（> - 10ghz）移频器。基于窄宽斜周期畴反转技术的电光晶体，实现了器件操作的质的改进。目标器件将用于光微波接口、光波分复用通信以及科学和工业测量。这种新型移频器类似于声光（AO）移频器。然而，它可以在更高的频率范围内工作（bbb10ghz），而传统的AO设备永远不会在这个频率范围内工作。将20μm畴反演技术应用于LiTaO_3电光晶体，设计制作了新型移频器。实验首次证实了移频16GHz、转换效率82%的Bragg衍射型移频器的工作原理。这一结果将发表在《IEEE光子技术快报》上。此外，我们还提出了一种利用周期域反演中反转区域宽度横向变化的超快电光偏转器和平面光频梳发生器。设计并制造了这两种新装置。实验证实，新型偏转器具有亚皮秒（<1ps）的偏转速度和32个可分辨的光斑，作为一种外部相位调制方法，新型梳状发生器可以产生最宽的平边带（带宽为0.8THz -3 dB）。

项目成果

Kyoji Shibuya, Shintaro Hisatake, Tetsuro Kobayashi: "10-GHz-order high-efficiency electrooptic frequency shifter using slant periodic domain inversion"IEEE Photonics Technology Letters. (to be published). (2004)

Kyoji Shibuya、Shintaro Hisatake、Tetsuro Kobayashi：“使用倾斜周期域反转的 10 GHz 阶高效电光移频器”IEEE 光子技术快报。

F.Kusunoki, H.Kawabata, T.Hiroshima, J.Takahara, T.Kobayashi, T.Sumida, S.Yanagida: "Suppression of total radiant flux by three-dimensional photonic crystal coatings"Electronics Letters. 39-7. 622-624 (2003)

F.Kusunoki、H.Kawabata、T.Hiroshima、J.Takahara、T.Kobayashi、T.Sumida、S.Yanagida：“三维光子晶体涂层对总辐射通量的抑制”电子快报。

高原淳一, 川畑弘, 長谷川靖哉, 長山智男, 小西毅, 細川陽一郎, 兼松泰男, 小林哲郎: "光子ブロックって何?"OPTRONICS. NO.254. 150-156 (2003)

Junichi Takahara、Hiromu Kawabata、Yasuya Hasekawa、Tomoo Nagayama、Tsuyoshi Konishi、Yoichiro Hosokawa、Yasuo Kanematsu、Tetsuro Kobayashi：“什么是光子块？”150-156（2003）。

高原淳一, 小林哲郎 (分担執筆): "金属導波路inナノ光工学ハンドブック"朝倉書店. 537-548 (2002)

Junichi Takahara、Tetsuro Kobayashi（撰稿人）：“纳米光学工程手册中的金属波导”Asakura Shoten 537-548（2002）。

F.Kusunoki, S.Fukumoto, J.Takahara T.Kobayashi: "Resonantly enhanced blackbody radiation from a periodic array of microcavities"QELS 2003, QWA25, June 2003, Baltimore, Maryland, USA..

F.Kusunoki、S.Fukumoto、J.Takahara T.Kobayashi：“来自周期性微腔阵列的共振增强黑体辐射”QELS 2003，QWA25，2003 年 6 月，美国马里兰州巴尔的摩。