Femtosecond Optics Group, Department of Physics, Imperial College London, Prince Consort Road, London SW7 2AZ, UK.
Opt Lett. 2009 Nov 15;34(22):3526-8. doi: 10.1364/OL.34.003526.
We evaluate the shape and chirp of nanosecond pulses from a fiber laser passively mode locked with a nanotube-based saturable absorber by using a synchronously scanning streak camera and a monochromator to directly measure the pulse spectrogram. We show that the stable sech(2) output pulse possesses a predominantly linear chirp, with a residual quartic phase and low noise. Comparison with analytical mode-locking theory shows a good quantitative agreement with the master equation mode-locking model.
我们通过使用同步扫描条纹相机和单色仪来直接测量脉冲光谱图，评估了基于纳米管的可饱和吸收体被动锁模的光纤激光器产生的纳秒脉冲的形状和啁啾。我们表明，稳定的 sech(2)输出脉冲具有主要的线性啁啾，具有残余的四次相位和低噪声。与解析锁模理论的比较表明，与主方程锁模模型具有良好的定量一致性。
