Li Jing, Wang Chuncan, Wang Peng
Opt Express. 2022 Feb 14;30(4):4768-4781. doi: 10.1364/OE.450372.
A switchable, widely wavelength-tunable noise-like pulse (NLP) and Q-switched Er-doped fiber (EDF) laser with a linear cavity structure is proposed and experimentally demonstrated in this work. The net-normal-dispersion mode-locked NLP operation based on a semiconductor saturable mirror (SESAM) is realized in a 57 nm continuous tuning range from 1528 to 1585 nm by using a tunable filter (TF). When the pump power is 500 mW, the NLPs produce a maximum average output power of about 16 mW with a 3-dB spectral bandwidth of about 17 nm at the central wavelength of 1555 nm, while the average peak power is about 58.8 W. The measured characteristics of the output NLPs at 1555 nm are consistent with the numerical results under the condition of Δβ2, net = 0.095 ps, and Esat = 0.77 nJ. In addition, stable Q-switched pulses with a 67 nm wavelength tuning range from 1518 to 1585 nm are obtained by adjusting the central wavelength of the filter. The maximum pulse energy reaches 231.4 nJ at the center wavelength of 1555 nm, corresponding to a peak power of about 278.8 mW. The proposed wavelength-tunable fiber laser is simple and versatile, demonstrating significant potential for numerous practical applications.
本文提出并通过实验验证了一种具有线性腔结构的可切换、宽波长可调谐类噪声脉冲（NLP）和调Q掺铒光纤（EDF）激光器。基于半导体可饱和吸收镜（SESAM）实现了净正常色散锁模NLP操作，通过使用可调谐滤波器（TF）在1528至1585 nm的57 nm连续调谐范围内实现。当泵浦功率为500 mW时，NLP在中心波长1555 nm处产生的最大平均输出功率约为16 mW，3 dB光谱带宽约为17 nm，而平均峰值功率约为58.8 W。在Δβ2, net = 0.095 ps和Esat = 0.77 nJ的条件下，1555 nm处输出NLP的测量特性与数值结果一致。此外，通过调整滤波器的中心波长，获得了波长调谐范围为1518至1585 nm、67 nm的稳定调Q脉冲。在中心波长1555 nm处，最大脉冲能量达到231.4 nJ，对应峰值功率约为278.8 mW。所提出的波长可调谐光纤激光器简单且通用，在众多实际应用中显示出巨大潜力。
