石英光纤中SRS及其连续谱研究  

Stimulated-raman Scattering and its Continual Spectrum in Silica Fiber

作　　者：张飞[1] 李承芳[1] 史丽娜[1] 熊贵光[1] 孙晓玮[2] 

机构地区：[1]武汉大学物理科学与技术学院,湖北武汉430072 [2]中国科学院上海微系统与信息技术研究所,上海200050

出　　处：《激光与红外》2005年第1期58-60,共3页Laser & Infrared

摘　　要：从理论和实验上研究了石英光纤中的SRS及其连续谱。理论上探讨了各级stokes线的来源与特点,分析了反斯托克斯线难以出现的原因和SRS的阈值与光纤长度的关系,并解释了光纤长120m时高阶stokes线呈现连续谱的原因。实验上用Nd+3∶YAG腔外倍频激光(波长为532nm)泵浦石英光纤,在光纤长度分别为15m和120m时,各拍摄得两级和五级stokes光谱图,测量了各级谱线的频移。理论分析和实验表明光纤越长,出现的stokes线级次越高,转换效率越高,阈值越低,越比较容易发生SRS效应,并易出现连续谱。理论和实验的结果相吻合。Stimulated-Raman Scattering in the fiber and its continual stokes spectrum were studied. The frequency doubled output of a Q-switched Nd ^(+3)∶YAG laser centered at 532 nm was used as input pump to excite multi-mode fiber with length of 15m and 120m,respectively.And we screened 2 orders and 5 orders SRS spectrum lines. Their origin was discussed and their frequency-shifts were measured.We reviewed their character,and analysed the reason that anti-stokes lines are difficult to arise and the relation of the SRS threshold in the fiber with the length of the fiber.The reason of the continual high-order stokes spectrum was also explained. The theoretical simulation and the experiment agree well.

关 键 词：光纤 受激拉曼散射 连续谱 SRS 斯托克斯光谱 

分 类 号：TN25[电子电信—物理电子学] O437.3[机械工程—光学工程]