Efficient Pumping Scheme by Direct Excitation of Upper Laser Level in Nd：CNGG  

作　　者：曹宁 李奇楠 赵研英 许长文 魏志义 冯宝华 张治国 张怀金 王继扬 何坤娜 高春清 

机构地区：[1]Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Be(iing 100190 [2]State Key Laboratory of Crystal-Material and Institute of Crystal Material,-Shandong University, Jinan 250100 [3]School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081

出　　处：《Chinese Physics Letters》2008年第11期4016-4018,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 60438020 and 50672050, and the National Basic Research Programme of China under Grant No 2004CB619002.

摘　　要：We report an efficient pumping scheme which involves a direct excitation of the upper lasing level of a four-level laser in a Nd-doped Caa （NbGa）2-x Ga3O12 （Nd：CNGG） by using a tunable Ti：sapphire, 700-920nm, cw pump source. The slope efficiency is improved from 10.5% of the traditional band pumping at 808nm to 21.8% of the direct pumping at 882nm. The influence of pumping wavelength on lasing is discussed. We present a scheme of double pumping for lasing.We report an efficient pumping scheme which involves a direct excitation of the upper lasing level of a four-level laser in a Nd-doped Caa （NbGa）2-x Ga3O12 （Nd：CNGG） by using a tunable Ti：sapphire, 700-920nm, cw pump source. The slope efficiency is improved from 10.5% of the traditional band pumping at 808nm to 21.8% of the direct pumping at 882nm. The influence of pumping wavelength on lasing is discussed. We present a scheme of double pumping for lasing.

关 键 词：the power-law exponents PRECIPITATION durative abrupt precipitation change 

分 类 号：O43[机械工程—光学工程]