摘要
为了抑制掠入射板条激光器晶体内部自激振荡,提出了在增益介质非通光表面涂覆近红外吸波材料—Ge的方法。实验对比了有Ge涂层与无Ge涂层的Nd:YAG晶体模块分别在自由振荡和被动调Q振荡条件下的激光输出特征。实验表明,在自由振荡条件下,有Ge涂层的晶体模块谐振腔激光输出阈值(54A)小于无Ge涂层晶体模块振腔激光输出阈值(59A),当泵浦电流为68A时,前者相对于无锗涂层晶体模块输出能量提高了51%;在被动调Q条件下,有Ge涂层的晶体模块谐振腔激光输出阈值(63.5A)小于无Ge涂层晶体模块谐振腔激光输出阈值(65A),当泵浦电流为67A时,前者相对于后者输出脉冲能量提高了75%。实验结果表明,Ge涂层能有效地抑制自激振荡,降低激光输出阈值并大幅提高输出脉冲能量。
In order to restrain the self-oscillations in Nd：YAG bounce laser, germanium with high absorp- tion coefficient in near infrared region was sputtered on the non-light-passed surfaces of the gain medi- urn. The laser outputs of free oscillator and passive Q-switched oscillator with germanium and without germanium were compared respectively. Germanium could effectively decrease the pump threshold and improve the pulse energy of outputs. The pulse energy of the free oscillator with Germanium-sputtered Nd：YAG is improved by 51% compared with that of the free oscillator with non-germanium-sputtered Nd.YAG when the current of the pump is 68 A. When the current of pump is 67 A,the pulse energy of the passive Qswitched oscillator with germanium-sputtered Nd： YAG is improved by 75% compared with that of the free oscillator with non-germanium-sputtered Nd：YAG.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2016年第8期787-791,共5页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(61378023)资助项目
