增益介质中泵浦光束提供的软光阑效应对于实现克尔透镜稳定锁模及其超宽带光谱脉冲的产生具有非常重要的作用．实验上首先对半导体泵浦全固化钛宝石飞秒激光器的锁模动态特性进行了研究，在4W绿光泵浦状态下获得了平均输出功率为570mW、中心波长在794nm～835nm范围内调谐、光谱带宽最大可达135nm的近红外光脉冲输出，其相应的时域变换极限脉冲宽度均小于10fs．另外，将光束聚焦在超薄BBO晶体上，获得了中心波长在418nm～429nm之间调谐、光谱宽带时域变换极限小于15fs的蓝光飞秒脉冲．

Soft gain aperture effect from pump beam size inside the laser crystal is crucial for obtaining stable Kerr lens mode-locking and generating ultrabroad-bandwidth pulses in Ti∶sapphire laser. Modelocking dynamics is experimentally investigated for a diode-pumped all-solid-state laser. At the pump power of 4 W,the femtosecond laser pulses tunable from 794 nm to 835 nm are generated with high output power of 570mW and extremely large bandwidths at the maximum of 135 nm,which can support the transform-limited pulse width in sub-10 fs time duration. Moreover,this laser is extended to blue pulses tunable from 418 nm to 429 nm by using a 260 μm-thick BBO crystal.The measured ultrabroad bandwidths are unprecedent in this spectral region,and their transformlimited pulse durations are sub-15 fs.