Nonlinear optical properties of stimulated Brillouin scattering process in submerged object detection  

作　　者：吕月兰 武立华 崇学庆 

机构地区：[1]College of Science Harbin Engineering University

出　　处：《Chinese Optics Letters》2008年第2期137-140,共4页中国光学快报（英文版）

基　　金：the China Postdoctoral Science Foundation(No.20060400230);the Foundation for Innovation Talents by the Technology Ministry of Harbin(No.2006RFQXG025)

摘　　要：Nonlinear optical properties of stimulated Brillouin scattering （SBS） to signal detection in water are analyzed. With the threshold characteristics, SBS only occurs when the high power laser is focused in the SBS cell. When there is an object present in front of the focus, it leads to lower incident intensity and then SBS does not occur. The backward SBS signal depends on the focusing location. The nonlinear optical properties of SBS process in the focusing regime are analyzed theoretically. With the object coming near to the focusing center, the backward Stokes signal rises up from zero to a maximum, and then grows to saturation. The delay time of the echo signal to pump signal can give the object location. In experiment, the peak position of varying rate of energy can give object location.Nonlinear optical properties of stimulated Brillouin scattering （SBS） to signal detection in water are analyzed. With the threshold characteristics, SBS only occurs when the high power laser is focused in the SBS cell. When there is an object present in front of the focus, it leads to lower incident intensity and then SBS does not occur. The backward SBS signal depends on the focusing location. The nonlinear optical properties of SBS process in the focusing regime are analyzed theoretically. With the object coming near to the focusing center, the backward Stokes signal rises up from zero to a maximum, and then grows to saturation. The delay time of the echo signal to pump signal can give the object location. In experiment, the peak position of varying rate of energy can give object location.

关 键 词：SOUND SPEED PHASE-CONJUGATION TEMPERATURE OCEAN WATER 

分 类 号：O437[机械工程—光学工程]