CAJ | 학술논문

在对水中受激布里渊散射阈值的研究中,针对传统定义上的不足,提出一种新的定义和新的测量方法.测量了不同能量的光束在不同长度的水介质中传输,在宽线宽和窄线宽情况下水的衰减系数.通过水的衰减系数的变化来确定不同情况下受激布里渊散射的阈值.试验发现,水中的受激布里渊阈值在理想稳态和理想瞬态下是一个常数,只与泵浦激光和介质属性有关,和介质长度无关;在中间情况下,受激布里渊阈值是否与介质长度有关,还要根据具体情况来分析.
재대수중수격포리연산사역치적연구중,침대전통정의상적불족,제출일충신적정의화신적측량방법.측량료불동능량적광속재불동장도적수개질중전수,재관선관화착선관정황하수적쇠감계수.통과수적쇠감계수적변화래학정불동정황하수격포리연산사적역치.시험발현,수중적수격포리연역치재이상은태화이상순태하시일개상수,지여빙포격광화개질속성유관,화개질장도무관;재중간정황하,수격포리연역치시부여개질장도유관,환요근거구체정황래분석.
In order to solve the insufficiency in the traditional definition for SBS threshold, a new definition and a noval measuring technique are proposed. The transmission of beam with different energy was measured at different lengths of water, and the attenuation coefficient of laser beam with different pulse energy was tested. The SBS threshold under different conditions was confirmed based on the attenuation coefficient. It was found during the experiment that the SBS threshold under the ideal stable state and the ideal transient state is a constant, it is related only to the pump laser and medium attribute, but not to the medium length. To other cases, the relationship between SBS threshold and length will be studied through further experiment.