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Double phase conjugation in copper-doped potassium sodium strontium barium niobate crystalsZhang, Liangmin; Zhang, Wanlin; Chen, Xiaojun; Zhang, Guangyin; Pan, Shihong; Zhang, Jingwen; Shao, Zongshu; Han, Jianru; Chen, Huanchu · ao/36/18/ao-36-18-4105.pdf · 1997