飞秒光参量振荡器的光谱净化和稳定性提升(特邀)

Spectrum cleaning and stability improvement of femtosecond optical parametric oscillator(Invited)

文中首次提出并验证了基于腔内色散管理实现飞秒光参量振荡器(OPO)光谱净化和稳定性提升的方法。对于高功率飞秒OPO,输出脉冲通常具有随时间无序变化的宽带不规则光谱,输出功率波动较大。利用铌酸锂(LiNbO_(3))晶体在腔内引入额外的负色散,通过泵浦脉冲的时间滤波效应实现了干净平滑的窄光谱近转换极限的飞秒脉冲输出,光谱稳定性和功率稳定性得到了极大改善。该方法是一种实现飞秒OPO光谱净化和稳定性提升的灵活简便的方法,对于发展高功率的超短脉冲OPO具有重要的应用价值。

A method for spectrum cleaning and stability improvement of femtosecond optical parametric oscillator(OPO)based on intracavity dispersion management was proposed and demonstrated for the first time.For high-power femtosecond OPO,the output pulses generally have irregular broadband spectrum varying with time,and the output power show a remarkable fluctuation.Through employing lithium niobate(LiNbO_(3))crystal to introduce additional negative dispersion in the cavity,transform-limited femtosecond pulses with cleaning and smooth spectrum by temporal filtering effect of pump pulses were realized,and the spectrum stability and power stability of femtosecond OPO were greatly improved.This method is a simple and flexible way to realize the spectrum cleaning and stability improvement of femtosecond OPO,and is of significant value for the development of high power ultrashort-pulse OPO.