飞秒锁模固态激光器中放大的自发辐射导致的时基抖动

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

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 (1 76 3t 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 。

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 sech(2) (1.763 t/tau),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.