Origin and suppression of back conversion in a phasematched nonlinear frequency down-conversion process  

作　　者：马金贵 王静 袁鹏 谢国强 钱列加 

机构地区：[1]Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, IFSA Collaborative Innovation Centre, Shanghai Jiao Tong University, Shanghai 200240, China

出　　处：《Chinese Optics Letters》2017年第2期59-62,共4页中国光学快报（英文版）

基　　金：supported by the National Basic Research Program of China (No. 2013CBA01505);the Science and Technology Commission of Shanghai (No. 15XD1502100)

摘　　要：Back conversion is an intrinsic phenomenon in nonlinear frequency down-conversion processes. However, the physical reason for its occurrence is not well understood. Here, we theoretically reveal that back conversion is the result of a π-phase jump associated with the depletion of one interacting wave. By suppressing the idler phase jump through a deliberate crystal absorption, the back conversion can be inhabited, thus enhancing the conversion efficiency from the pump to the signal. The results presented in this Letter will further the understanding of nonlinear parametric processes and pave the way toward the design of highly efficient down-conversion systems.Back conversion is an intrinsic phenomenon in nonlinear frequency down-conversion processes. However, the physical reason for its occurrence is not well understood. Here, we theoretically reveal that back conversion is the result of a π-phase jump associated with the depletion of one interacting wave. By suppressing the idler phase jump through a deliberate crystal absorption, the back conversion can be inhabited, thus enhancing the conversion efficiency from the pump to the signal. The results presented in this Letter will further the understanding of nonlinear parametric processes and pave the way toward the design of highly efficient down-conversion systems.

关 键 词：OPTICS PHYSICS 

分 类 号：O437[机械工程—光学工程]