单次飞秒激光脉冲在玻璃内部产生多次微爆的研究

在入射能量不同的情况下，用近红外飞秒激光脉冲在重钡火石玻璃（ZBaF15）内部产生了色心和微爆，在熔融石英的内部产生了多次微爆现象.实验表明：入射能量较高时，色心的中间会产生微爆；在松聚焦条件下，一个飞秒激光脉冲在透明介质内会激发多次微爆.基于飞秒激光脉冲在透明介质内的自聚焦效应和自由电子等离子体的自散焦效应，理论分析了多次微爆产生的原因；也讨论了飞秒激光脉冲诱导玻璃折射率改变的机理.

Multiple micro-explosions induced by a single focused femtosecond pulse in glass

Color-center and micro-explosions are generated in ZBaF15 optical glass by using focused near-IR femtosecond laser pulse with different incident energy.And multiple-explosions are induced in fused silica.The experiments show that the micro-explosions driven in the center of color-center region are observed in ZBaF15 optical glass with high incident energy.With loose focusing,multiple micro-explosions occur in fused silica and ZBaF15 optical glass with a single femtosecond pulse.Based on the self-focusing effect and free-electron plasma defocusing effect induced by femtosecond laser pulse in transparent material,multiple-micro explosions are analyzed in theory.At the same time,the mechanism of refractive index modification,which induced by femtosecond pulse,is discussed too.