Cu：KNSBN晶体中光折变波导诱导532nm连续光自泵浦相位共轭

532 nm CW Laser Beam Self-pumped Phase Conjugation Induced by a Photorefractive Waveguide in Ce doped KNSBN Crystal

在原来用８ｍＷ连续５３２ｎｍ激光不能产生自泵浦相应共轭的入射角下．先用锁模５３２ｎｍ的ｐｓ激光脉冲在Ｃｕ：ＫＮＳＢＮ晶体中预制一条光折变波导，就很容易用连续５３２ｎｍ激光形成自泵浦相位共轭。预制的光折变波导在一般照明条件下可保存３０ｍｉｎ以上。

We report CW laser beam self-pumped phase conjugation (SPPC) induced by aphotorefractive waveguide created by SPPC of CW mace- locked laser radiation inphotorefractive crystal Cu: KNSBN. After a waveguide is created in the crystal by usingthe second harmonic of a CW mode-locked Nd: YAG laser at 532 urn, self--pumped phaseconjugation can be achieved by using the same wavelength CW laser beam at some incidenceangles where SPPC cannot be achieved by using the CW laser beam alone. The lifetime ofthe photorefractive waveguide is longer than 30 minutes under dark conditions.