摘要
It is shown that the cascaded fifth-order nonlinear phase shifts will increase with energy loss in the cascaded processes. Essentially different from the multi-photon absorption accompanied with inherent material nonlinearities, the loss of fundamental wave in a cascaded process is controllable and suppressible. By introducing difference frequencies generated from the reaction between the fundamental and its second harmonic after the cascaded processes, the fundamental wave can be free of energy loss, while the large cascaded fifth-order nonlinear phase shift is maintained.
It is shown that the cascaded fifth-order nonlinear phase shifts will increase with energy loss in the cascaded processes. Essentially different from the multi-photon absorption accompanied with inherent material nonlinearities, the loss of fundamental wave in a cascaded process is controllable and suppressible. By introducing difference frequencies generated from the reaction between the fundamental and its second harmonic after the cascaded processes, the fundamental wave can be free of energy loss, while the large cascaded fifth-order nonlinear phase shift is maintained.
作者
XU Guang1, QIAN Liejia2, WANG Tao2, FAN Dianyuan1,2 & LI Fuming2 1. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2. State Key Laboratory for Advanced Photonic Materials and Devices, Fudan University, Shanghai 200433, China Correspondence should be addressed to Xu Guang (email: xuguany@siom.ac.cn) Received March 9, 2003
基金
supported by the National Natural Science Foundation of China(Grant Nos.60088003 and 10276012)
National High-Tech Committee of China and National Project 973 of China(Grant No.G19990752023).
