Xu Zhen, Jia Dongfang, Wang Zhaoying, Ge Chunfeng, Yang Tianxin
Appl Opt. 2021 May 1;60(13):3591-3595. doi: 10.1364/AO.423380.
We demonstrate the generation of a type of square-shaped pulse in a passively mode-locked erbium-doped fiber laser based on the nonlinear optical loop mirror technique. Through adjusting the pump power and polarization state, square-shaped pulses are generated. Furthermore, we investigate the pulse profile in relation to the optical spectrum. By filtering out short-wavelength spectrum components gradually, pulse shaping is achieved, and the top of the square-shaped pulse becomes flat. Subsequently, by filtering out long-wavelength spectrum components, a type of h-shaped pulse is obtained and the formation reason is also investigated.
我们展示了基于非线性光学环形镜技术在被动锁模掺铒光纤激光器中产生一种方形脉冲的方法。通过调节泵浦功率和偏振态，产生了方形脉冲。此外，我们研究了与光谱相关的脉冲轮廓。通过逐渐滤除短波长光谱分量，实现了脉冲整形，方形脉冲的顶部变得平坦。随后，通过滤除长波长光谱分量，获得了一种h形脉冲，并对其形成原因进行了研究。
