Basic research on optical distributor using orthogonally polarized four wave mixing

正交偏振四波混频光分配器的基础研究

基本信息

批准号：
12650330
负责人：
MISHIMA Teruhito
金额：
$ 2.3万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650330/
关键词：
Orthogonally polarized pump FWM Photorefractive effect Optical signal distributor OPPFWM Time constant Temporal response Switching Phase conjugation 正・負キャリア位相共役光回折効率

项目摘要

The temporal response is one of basic and important properties of optical signal distributor. The response of orthogonally polarized pump four wave mixing (OPPFWM) for optical signal distributor investigated intensively by this research :In the first year (FY2000), we discovered some BaTiO_3 crystals exhibit an anomalous phenomena that the diffraction efficiency of OPPFWM distributor increases for a first few seconds of grating erasure period. We showed, through theoretical analysis and experiment, the phenomena happens when both negative and positive charge carriers with different time constants exist and primary charge carrier has longer time constant, comparing to secondary charge carrier.In the second year (FY2001), we studied in the two cases : Primary and secondary gratings are in phase and they are totally out of phase. We showed in the out of phase case the grating erasure is much faster than the other. In addition to it, we proposed a novel way for switching the distributor by applying external electric field to the crystal and destroy the phase-matching of the four wave mixing, without erasing the gratings. By this way, it is possible that the switching time becomes shorter by several orders of magnitudes.In conclusion, we have obtained useful results on basic properties of OPPFWM, especially on its temporal behavior for optical signal distributors.

时间响应是光信号分配器的基本和重要特性之一。正交极化泵四波混合（OPPFWM）对这项研究进行了深入研究的光信号分配器的响应：在第一年（2000财年），我们发现某些Batio_3晶体表现出异常的现象，表明OPPFWM发行商的衍射效率提高了第一年几秒钟的光栅擦除时期。我们通过理论分析和实验表明，当存在不同时间常数的负和正电荷载体和主电荷载体具有更长的时间常数时，就会发生这种现象。与二级荷载载流子相比，我们第二年（2001财年）进行了研究，我们在研究中进行了研究。这两种情况是：主要和次要光栅处于阶段，它们完全不相同。我们在偏置情况下显示了光栅擦除速度比另一个更快。除此之外，我们提出了一种新颖的方式来切换分配器，通过将外部电场应用于晶体并破坏四个波混合的相位匹配，而无需擦除光栅。通过这种方式，切换时间可能会被几个幅度的阶数变短。总而言，我们已经在OPPFWM的基本属性上获得了有用的结果，尤其是在其光学信号分布人的时间行为上。