啁啾脉冲堆积宽带激光的时间与频谱特性分析

理论研究了啁啾堆积脉冲宽带激光时间与频谱特性与子脉冲参量的关系.结果表明,变换极限子脉冲堆积所得的脉冲平滑,频率啁啾型与时间啁啾型子脉冲堆积所得脉冲出现时间调制,平滑性变差,从频谱上看,前者出现单一谱线,而后者可看到多条谱线|随着子脉冲间延迟的增加,堆积脉冲由脉冲间干涉引起的时间调制增多,但幅度减弱,而频谱的谱线数量增加.所得结果可为适当地选择堆积脉冲参量以获得所需的时间与频谱形状的宽带激光提供参考.

Characteristics of Temporal Wave-form and Frequency Spectrum of Broad-band Laser Pulse Stacked by Chirped Pulses

The dependence of the temporal wave-form and frequency spectrum of the broad-band laser pulse stacked by chirped pulses on the parameters of the sub-pulses is investigated theoretically and numerically.It is shown that,the temporal wave-form of the broad-band lasers stacked by the transform-limited pulses is usually smoothing,while that stacked by chirped pulses takes detrimental modulation.And the former consists of one spectrum line,while the latter consists of multiple spectrum lines.In addition,with the delay-time between neighboring sub-pulses increasing,the modulation riding on the broad-band laser pulse increases,and results in the spectrum lines of the output pulse to increase.The results can help in generating broad-band laser pulse of specific temporal wave-form and frequency spectrum by optimize parameters of the sub-pulses.