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Signal Amplification by Two-Wave Mixing in Dye-Doped Films

染料掺杂薄膜中两波混合的信号放大

基本信息

批准号：
01460080
负责人：
FUJIWARA Hirofumi
金额：
$ 3.07万
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 (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

The present work is concerned with observation of self-diffraction when two beams, signal beam and pump beam, are introduced into optical nonlinear media (dye-doped polymer films). In two-wave mixing. Two coherent beams intersect in the film and the one of them is enhanced at the expense of the other. The power transfer is performed by introducing a phase shift between the interference pattern and the phase-and/or absorption-grating. In an organic-dye-doped film, frequency shifting of one of two beams creates a moving grating and thus leads to the phase shift because of the nonzero response time of the nonlinear optical material.(1) For saturable dyes, the normalized self-diffracted intensity has a product of two components : the antisymmetric component with respect to the frequency difference OMEGA of the two waves, which is due to the dispersion of refractive index has a positive or negative exponential gain for OMEGA > 0 or OMEGA<0 for positive detuning parameter, respectively, and the symmetric one arising from absorption of the pump wave has a negative exponential gain for all OMEGA.(2) For xanthene dyes and azine dyes the intensity of the self-diffracted beam increased at most by several percent compared with that of the transmitted beam for OMEGA = 0.(3) For azo dyes, self diffraction was observed even when two beams were cross-polarized.(4) Amplification will be observed with a high power laser whose wavelength is off resonance.

目前的工作涉及将两束光束（信号光束和泵浦光束）引入光学非线性介质（染料掺杂聚合物薄膜）时观察自衍射。在两波混频中。两束相干光束在薄膜中相交，其中一束的增强会削弱另一束的强度。通过在干涉图案与相位和/或吸收光栅之间引入相移来执行功率传输。在有机染料掺杂薄膜中，两束光束之一的频移会产生移动光栅，从而由于非线性光学材料的非零响应时间而导致相移。(1) 对于可饱和染料，归一化自衍射强度具有两个分量的乘积：相对于两个波的频率差 OMEGA 的反对称分量，这是由于折射色散造成的对于正失谐参数，指数增益分别对于 OMEGA > 0 或 OMEGA <0 具有正指数增益或负指数增益，而由泵浦波吸收产生的对称增益对于所有 OMEGA 具有负指数增益。(2) 对于呫吨染料和吖嗪染料，自衍射光束的强度与 OMEGA = 0 时的透射光束的强度相比最多增加几个百分点。(3) 对于对于偶氮染料，即使两束光交叉偏振，也能观察到自衍射。(4)用波长非共振的高功率激光观察到放大。