飞秒锁模固态激光器中放大的自发辐射导致的时基抖动

基于飞秒锁模固态激光系统,推导了激光脉冲的振幅、脉宽的倒数、啁啾、频率、中心位置和位相的运动方程.在低的白噪声的假设下,估算了含啁啾的钛宝石激光器中由放大的自发辐射引起的时基抖动.结果表明:对于一台脉冲轮廓为sech²(1763t/τ)的确定的锁模固态激光系统,时基抖动近似为净群速延迟色散(GDD)的线性函数,且随着GDD的增加而变大;然而,即便在GDD被完全补偿的情况下,时基抖动也不会是零关键词：时基抖时放大的自发辐射飞秒锁模固态激光系统

TIMING JITTER INDUCED BY AMPLIFIED SPONTANEOUS EMISSION IN A FEMTOSECOND MODE-LOCKED SOLID-STATE LASER

We have derived a set of motion equations for the amplitude,the inverse pulse width,the chirp,the frequency,the central position of the pulse and the phase in a mode-locked solid-state laser.In the hypothesis of the low and white noise,the timing jitter induced by the amplified spontaneous emission was estimated for a Ti:sapphire laser with the chirp.It is found that for a certain mode-locked solid-state laser with a pulse profile of sech2(1.763t/τ),the jitter is approximatively a linear function of the net group delay dispersion (GDD),and turns to be larger with increasing GDD ;however,it cannot be reduced to zero even if the GDD is completely compensated.