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通过飞秒放大增益饱和理论及飞秒脉冲展宽的理论计算与分析 ,指出在优化放大腔结构参数及改变抽运光能量情况下 ,可以在省略展宽器基础上实现中等能量的飞秒脉冲再生放大 .以此为依据 ,采用低抽运能量和放大腔中钛宝石晶体离焦技术 ,成功地进行了无展宽器的高重复率飞秒钛宝石再生放大及压缩技术的实验研究 ,并获得了高光束质量的飞秒放大光脉冲 ,放大光脉冲能量大于 10 0 μJ,重复频率为 1kHz,光谱带宽 7.7nm ,压缩后脉宽 5 0 0fs.
Through the theoretical calculation and analysis of the femtosecond amplification gain saturation theory and the femtosecond pulse broadening, it is pointed out that the medium energy femtosecond pulse regeneration amplification can be realized on the basis of omitting the stretcher under the condition of optimizing the structure parameters of the amplification cavity and changing the pumping light energy On the basis of this, we successfully carried out the experimental research on the regenerative amplification and compression technology of high repetition rate femtosecond Ti: sapphire without stretcher using the low pumping energy and the Ti: The femtosecond amplifying optical pulse of the beam quality amplifies the optical pulse energy to be greater than 10 0 μJ, the repetition frequency is 1 kHz, the spectral bandwidth is 7.7 nm, and the compressed pulse width is 500 fs.