STUDY ON ULTRAFAST UNIDIRECTIONAL ELECTROOPTIC DEFLECTOR AND ITS APPLICATION

超快单向光电偏转器研究及其应用

基本信息

批准号：
07555017
负责人：
KOBAYASHI Tetsuro
金额：
$ 4.93万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

The purpose of this study is development of ultrafast electrooptic modulators and deflectors which are applicable to generation and control of ultrashort optical pulses. For this purpose, we have developed the specially designed electrooptic modulators/deflectors which can operate with extremely large modulation indices in the 10 GHz region and can generate extremely wide optical sideband.Here, we, at first, continued the study on new kinds of electro-optic phase modulator as well as deflector utilizing quasi velocity matching (QVM) with periodic domain inversion of the electro-optic crystals. As a result, we have established stable method to generate the optical sidebands whose width is in the THz region. In addition, we proposed a new kind of electro-optic deflector with tilt periodic domain inversion of the electro-optic crystal, where the periodic structure is used for quasi-velocity matching between the driving electric signal and the traveling light wave as well as inducing the traveling phase grating with the pitch free from the electrical wave-length.Using this device, we can obtain the deflector and the frequency shifter which is similar to an acousto-optic deflector (AOD) but its driving frequency is much higher than AOD.We analyzed the operation of the new device theoretically and fabricated this kind of deflector with a LiTaO_3 EO crystal. In the preliminary experiment, we confirmed its operation at 16.25GHz.We also have applied the patent of this new deflector through the Japan Society for the Promotion of Science (JSPS).

本研究的目的是开发适用于超短光脉冲生成和控制的超快电光调制器和偏转器。为此，我们开发了专门设计的电光调制器/偏转器，它可以在10 GHz范围内以极大的调制指数工作，并且可以产生极宽的光边带。在这里，我们首先继续研究新型电光调制器/偏转器。 -光相位调制器以及偏转器，利用准速度匹配（QVM）和电光晶体的周期域反转。因此，我们建立了稳定的方法来生成宽度在太赫兹区域的光学边带。此外，我们提出了一种新型电光偏转器，具有电光晶体倾斜周期畴反转，其中周期结构用于驱动电信号和行进光波之间的准速度匹配以及诱导节距不受电波影响的行进相位光栅。利用该装置，我们可以获得类似于声光偏转器（AOD）的偏转器和移频器，但其驱动频率远高于声光偏转器。 AOD。我们从理论上分析了新器件的工作原理，并用LiTaO_3 EO晶体制作了这种偏转器。在初步实验中，我们确认了其工作频率为16.25GHz。我们还通过日本学术振兴会（JSPS）申请了这种新型偏转器的专利。