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Generation of Phase-Conjugate Waves in Saturable Dye-Doped Films and Transient Properties of Phase-Conjugated Waves

可饱和染料掺杂薄膜中相位共轭波的产生及相位共轭波的瞬态特性

基本信息

批准号：
62550021
负责人：
FUJIWARA Hirofumi
金额：
$ 1.41万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550021/
关键词：
Phase conjugate waves Organic dyes Degenerate four-wave mixing 位相共役干渉法可飽和吸収

项目摘要

There has been some interest in optical phase conjugation with dye-doped ransparent polymer films. Some of xanthene and azo dyes have strong absorption at wavelengths of an argon-ion laser and also relatively long life times of their excited states, which make it possible to generate cw phase-conjugate waves at low intensities less than 0.5w/cm^2.Thick(10-100 m) and thin (<10 m) dye-doped polymer films were prepared by dip and spin-coating methods, respectively.Main mechanisms to produce phase-conjugate waves are due to the grating formation of (1) population by saturable absorption by dyes, (2) photo-induced orientation of dyes and (3) irreversible photo-induced chemical changes.As each grating has a different decay time, it can be separately observed by turning off a probe beam in a degenerate four-wave mixing configuration: In general, decay times of phase-conjugate waves increase in the order of magnitude.(1).(2)and(3).Dominant mechanisms of generation of phase-conjugate waves are (1) and (3) for xanthene-dye-doped films and (2) and (3) for azo-dye-doped films. However. whether (3) contributes to generation of phase conjugate waves or not, depends upon the combination of dyes and matrices. For example, (3) contributes to it in methylred-doped PMMA films but not in methylred-doped galatin films. It is very intersting that the intensity of phase conjugate wave by azo dyes are by about 20 times in the case of perpendicular polarization bet-ween pump and probe waves larger than in the case of parallel porarization.

利用染料掺杂的透明聚合物薄膜实现光学相位共轭已经引起了人们的兴趣。有些氧杂蒽和偶氮染料在氩离子激光波长处有很强的吸收，而且它们的激发态寿命也相对较长，这使得在小于0.5W/cm ^2的低强度下产生连续波相位共轭波成为可能。通过浸涂和旋涂方法制备染料掺杂的聚合物薄膜（10-100 μ m）和薄的（<10 μ m），产生相位共轭波的主要机制是由于（1）染料的可饱和吸收的布居、（2）染料的光致取向和（3）不可逆的光致化学变化的光栅形成。由于每个光栅具有不同的衰减时间，它可以通过在简并四波混频配置中关闭探测光束来单独观察：通常，相位共轭波的衰减时间以数量级增加。（一）.（2）和（3）.相位共轭波产生的主要机制是（1）和（3）对于氧杂蒽染料掺杂的膜和（2）和（3）对于偶氮染料掺杂的膜。然而.（3）是否有助于相位共轭波的产生取决于染料和基质的组合。例如，（3）有助于它在甲基红掺杂的PMMA薄膜，但不是在甲基红掺杂的半乳糖苷膜。有趣的是，偶氮染料在泵浦光与探测光垂直偏振时的相位共轭波强度比平行偏振时大20倍左右。