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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 17fs啁啾脉冲压缩至半高全宽为 8 5fs的近似转换极限脉冲 .
The amplitude and phase of the femtosecond pulse output from the Kerr-lens-mode-locked Ti: sapphire laser were diagnosed by the second harmonic spectral resolution optical shutter method. The pulse envelope was measured as hyperbolic secant and the phase was approximately The third power form of time.The second order group velocity dispersion is diagnosed by fitting the phase of the pulse frequency domain, which is the main cause of the pulse chirp, which leads to the pulse broadening.Using the prism to compensate the second order group velocity dispersion, The chirp pulse is compressed to an approximate conversion limit pulse with a full width at half maximum of 8 5 fs.