本文提出和实验论证了两种用简并的四波混频补偿激光放大器相位畸变的方案.在第一种方案中,混频介质饱和吸收体BDN染料二氯乙烷液体置于激光振荡器腔外,用偏振隔离技术,相位补偿的激光辐射从Nd:YAG激光振荡放大系统中耦合出来.实验得到了放大约四倍的后向波输出.在第二种方案中,相位共轭镜置于激光振荡器腔内,BDN染料溶液既作为简并的四波混频介质,又作为调Q介质,获得了补偿放大器相位畸变的调Q激光输出、研究了相位补偿特性.测量了激光输出与染料溶液浓度的关系.

Two schemes of compensation for phase distortions in the laser amplifier have been proposed and experimentally demonstrated by using degenerate four-wave mixing. In the first scheme, BDN dye solution in diohloride ethane was used as the nonlinear medium, the saturable absorber was put outside of the laser ocillator. Using polarization discrimination, phase compensated output was coupled from Nd:YAG laser system. The backward wave output amplified about four times was experimentally obtained. In the other soheme, a phase conjugate mirror was put inside the oscillator cavity. The BDN dye solution was used as the degenerate four-wave mixing and the Q-switohing medium as well. Q-switehed output compensated for phase distoriiions in the amplifier wag obtained. The property of compensating for phase distortions was investigated. The laser output as a function of the conoentration of BDN dye solution was measured.