模拟了随着传播长度的增加,基频和倍频激光脉冲的时域波形和光谱特性的演变过程.通过引入走离长度和非线性长度,给出了走离效应、群速度色散和三阶非线性效应对飞秒脉冲倍频的影响.研究了飞秒脉冲倍频的波长调谐特性,发现40 ps基频脉冲波长调谐带宽仅有2.8 nm,而40 fs基频脉冲的倍频波长调谐带宽高达42 nm.这在周期极化倍频晶体工艺中有重要应用价值.
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