全固化自锁模飞秒Ti:S激光器实验研究

首次在国内系统报道了以腔内LBO倍频Nd:YVO₄激光器为泵浦源的全固化自锁模飞秒钛宝石激光器的实验结果.设计了一种热不敏腔内LBO倍频线性折叠腔结构,获得到了25.5%的光转换效率,泵浦功率为22W时得到了5.6W的基模绿光输出功率;以该激光器为泵浦源,在线性Z型腔的基础上,使用了一种能够通过改变腔内凹面聚焦镜折叠角消除象散的方法,直接由钛宝石激光器得到了脉冲宽度为22fs、功率为300mW的光脉冲.整个激光系统稳定性好,噪音明显低于Ar³⁺激光器的泵浦情况.

EXPERIMENT OF ALL-SOLID-STATE SELF-MODE-LOCKED FS Ti:S OSCILLATOR

All-solid-state self mode locked fs Ti:Sapphire oscillator pumped by Nd:YVO₄ laser with intracavity LBO frequency-doubling is reported systematically.To our knowledge,it is first time inside our country.A new linear fold cavity which is insensitive to thermal for Nd:YVO₄ laser with intracavity LBO frequency-doubling is designed.5.6W green laser can be achieved at a pumping power of 22W.Corresponding to conversion efficiency is 25.5%.22fs and 300mW pulse trains have been obtained directly from Ti:Sapphire oscillator pumped by our Nd:YVO₄,A new method is used,in which can eliminate astigmatism inside cavity by changing the fold angle on concave focus mirror of the Ti:Sapphire oscillator based on a linear Z cavity.The stability of all the laser system is good and its noise is much lower than the laser pumped by Ar³⁺ laser.