摘要
脉宽为50～60ps的超短激光脉冲列在Ce:KNSBN晶体中实现二波耦合和四波混频相位共轭。环境的微振动使二波耦合和四波混频相位共轭信号变得不稳定。当泵浦光脉冲从相对于探测光脉冲早到变为迟到时,二波耦合探测光信号从缩小变到放大。四波混频相位共轭信号出现双脉冲。晶体中存在纳秒光折变效应。
Two-wave coupling and four-wave mixing phase conjugation have been achived by using laser pulses of 50-60 ps duration at wavelength of 0.53μm in Ce doped KNSBN crystal. The signal intensities of two-wave coupling and four-wave mixing phase conjugation become unstable, which were caused by the weak vibration of circustance. The signal intensities of two-wave coupling changed from below the background of uncoupling to over the background when the delay of pumping pulses relative to the probe pulses changed from negative to positive. There existed double pulses in the signal of phase conjugation and a ns photorefractive effect was observed in the crystal.
关键词
二波耦合
四波混频
晶体
激光
脉冲
Two-wave coupling
Four-wave mixing phase conjugation
