Chowdhury Sourav Das, Pal Atasi, Chatterjee Sayan, Sen Ranjan, Pal Mrinmay
Appl Opt. 2018 Feb 10;57(5):1225-1230. doi: 10.1364/AO.57.001225.
In this paper, we propose an all-normal-dispersion ytterbium-fiber laser with a novel ring cavity architecture having two nonlinear amplifying loop mirrors (NALM) as saturable absorbers, capable of delivering distinctly different pulses with adjustable features. By optimizing the loop lengths of the individual NALMs, the cavity can be operated to deliver Q-switched mode-locked (Q-ML) pulse bunches with adjustable repetition rates, mode-locked pulses in dissipative soliton resonance (DSR) regime or noise-like pulse (NLP) regime with tunable pulse width. The DSR pulses exhibit characteristic narrowband spectrum, while the NLPs exhibit large broadband spectrum. The operation regime of the laser can be controlled by adjusting the amplifier pump powers and the polarization controllers. To the best of the authors' knowledge, this is the first demonstration of a single mode-locked cavity where narrowband DSR pulses and broadband NLPs alongside Q-ML pulse bunches can be selectively generated by employing two NALMs.
在本文中，我们提出了一种具有新型环形腔结构的全正色散镱光纤激光器，该环形腔结构有两个非线性放大环镜（NALM）作为饱和吸收体，能够产生具有可调节特性的明显不同的脉冲。通过优化各个NALM的环长，该腔可以运行以产生具有可调重复率的调Q锁模（Q-ML）脉冲串、耗散孤子共振（DSR） regime下的锁模脉冲或具有可调脉冲宽度的类噪声脉冲（NLP） regime。DSR脉冲呈现出特征性的窄带光谱，而NLP呈现出大的宽带光谱。激光器的运行状态可以通过调节放大器泵浦功率和偏振控制器来控制。据作者所知，这是首次展示一种单锁模腔，其中通过采用两个NALM可以选择性地产生窄带DSR脉冲、宽带NLP以及Q-ML脉冲串。
