Raman Gain Square‐Wave Noise‐Like Pulse Laser Pumped by a Random Fiber Laser,Annalen Der Physik

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Raman Gain Square‐Wave Noise‐Like Pulse Laser Pumped by a Random Fiber Laser
Annalen Der Physik ( IF 2.2 ) Pub Date : 2021-01-15 , DOI: 10.1002/andp.202000452
Shanshan Wang ₁ , Weili Zhang ₁ , Yanli Zhang ₁ , Yunjiang Rao ₁

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Mode locking of a long‐cavity Raman fiber laser pumped by a low‐noise random fiber laser (RFL) is demonstrated experimentally, where tunable square‐wave noise‐like pulse (NLP) is generated through nonlinear polarization rotation technology. Pulse duration can be tuned from 26 to 134 ns by controlling the polarization state or pump power at a repetition rate of 93 kHz. A signal‐to‐noise ratio of 64 dB is obtained due to the low‐noise characteristic of RFL. In addition, up to 24th high‐order harmonic mode‐locked square‐wave NLP is observed, which has not been reported in mode‐locked Raman fiber lasers with large normal dispersion. This approach not only provides a good temporal stable pump source for mode locking of Raman fiber lasers, but also enriches the methods of laser pulse generation and regulation.

中文翻译：

随机光纤激光器泵浦的拉曼增益方波类噪声脉冲激光器

实验证明了由低噪声随机光纤激光器（RFL）泵浦的长腔拉曼光纤激光器的锁模，其中通过非线性偏振旋转技术生成了可调方波噪声样脉冲（NLP）。通过以93 kHz的重复频率控制极化状态或泵浦功率，可以将脉冲持续时间从26 ns调整为134 ns。由于RFL具有低噪声特性，因此信噪比为64 dB。此外，观察到多达24次高次谐波锁模方波NLP，这在正常色散较大的锁模拉曼光纤激光器中尚未见到。这种方法不仅为拉曼光纤激光器的锁模提供了一个良好的时间稳定泵浦光源，而且丰富了激光脉冲产生和调节的方法。

更新日期：2021-02-10

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