%0 Journal Article
%T Conversion phenomenon of defocusing-contract in Cu:KNSBN crystals<br>Cu:KNSBN晶体中光束散焦-收缩转换现象
%A He Guo-Gang
%A Wang Xiao-Sheng
%A She Wei-Long
%A Tao Meng-Xian
%A Lin Li-Peng
%A <br>何国岗
%A 王晓生
%A 佘卫龙
%A 陶梦仙
%A 林励平
%J 物理学报
%D 2002
%I 
%X We have observed that a weak light beam will experience a defocusing\|contract process before it comes to steady state when passing through a Cu:KNSBN crystal with a transient spatial electric field. This process became fast by increasing intensity of the light beam. We believe that the defocusing\|contract process results from both effects of the transient electric field in the crystals and the photovoltaic and refocusing fields generated by the beam itself.
%K Defocusing
%K Photovoltaic effect
%K spatial electric fields<br>散焦
%K 光伏效应
%K 空间电荷场
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=BFCB92C8FFB917CC&yid=C3ACC247184A22C1&vid=987EDA49D8A7A635&iid=CA4FD0336C81A37A&sid=D59111839E7C8BDF&eid=4C100B7696CE9E24&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=24