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采用二次谐波-频谱分辨光闸法对克尔透镜锁模钛宝石激光器输出的飞秒脉冲的振幅和相位 进行诊断,测得其脉冲包络是双曲正割型的,而相位则近似为时间的三次幂形式. 通过对脉 冲频域相位的拟合,诊断出二阶群速度色散是造成脉冲啁啾、导致脉冲展宽的主要原因. 利 用棱镜对补偿二阶群速度色散,进一步将17 fs啁啾脉冲压缩至半高全宽为8.5 fs的近似转 换极限脉冲.
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关键词:
- 飞秒脉冲 /
- 二次谐波-频谱分辨光闸法 /
- 群速度色散
The amplitudes and phases of femtosecond pulses generated from a home-made KLM Ti: Sapphire laser are diagnosed by using the technique of second-harmonic generation frequency-resolved optical gating. The results indicate that the profiles of the pulses are sech2 shapes and the phases are approximately cub ic dependent of the time. The chirped pulses of 17 fs(FWHM) are compressed to near Fourier transform limited pulses of 8.5 fs with a double-prism system to compensate for the second-order dispersion.-
Keywords:
- femtosecond pulses /
- method of second-harmonic generation frequency-resolved opti cal gating /
- group velocity dispersion
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