正向抽运脉冲染料激光放大时间特性研究  

Temporal Characteristics Research of Forward Longitudinally Pumped Dye Laser Amplifier

作　　者：谈小虎[1,2] 张志忠[2] 张云兴[2] 张晓卫[2] 张贵忠[1] 姚建铨[1] 

机构地区：[1]天津大学精仪学院,天津300072 [2]核工业理化工程研究院,天津300180

出　　处：《中国激光》2010年第9期2346-2350,共5页Chinese Journal of Lasers

基　　金：国家973计划(2007CB310403);国家自然科学基金(10674100);天津市科委基金(07JCYBJC06100)资助课题

摘　　要：主振荡-功率放大是获得高功率脉冲染料激光的有效模式,染料激光脉冲在放大过程中,与抽运激光脉冲的时序匹配是获得高效转换的基本条件之一。采用速率方程对高重复频率、调Q和倍频Nd:YAG激光正向抽运脉冲放大过程进行了数值模拟,研究了实际应用中,抽运激光脉宽大于染料激光脉宽条件下的放大过程的时间特性。结果显示,当最佳时序匹配时,抽运激光脉冲峰值相对信号激光延迟具有纳秒量级的滞后,抽运激光脉冲越宽,滞后越多,同时,染料分子的激发-受激辐射-再激发的动态过程造成放大后的染料激光脉冲被展宽,分析显示采用固定抽运激光脉冲峰值位置的方法进行时序控制是可行的。The master-oscillator power-amplifier chain is an efficient method to obtain high power pulsed dye laser.The timing match between pumping and dye laser pulses is one of the main conditions to realize high extraction efficiency.The dye laser amplifier forward longitudinally pumped by a high-pulse-repetition,Q-switched and frequency-doubled Nd： YAG laser is simulated with rate equation model.The temporal characteristics of pulse amplification are presented with real pumping and dye laser pulse shape,where the pumping laser pulse width is longer than dye laser′s.The simulation results show that there is nanosecond delay between pulse peak of dye laser pulse and that of pumping laser pulse.The results also show that the amplified dye laser pulse is widened by the process of excitation,stimulated emission,and re-excitation of dye molecules when the pulse width of pumping pulse is wider than that of dye laser pulse.The analysis indicates that it is feasible to timing control with the method of keeping pumping pulse peak position stable.

关 键 词：激光器 时间特性 速率方程 染料激光放大 

分 类 号：TN248.3[电子电信—物理电子学]