Author Affiliations
Abstract
1 Key Laboratory of Opto-electronic Information and Technical Science, College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
2 Department of Applied Physics, Tianjin University, Tianjin 300072, China
We experimentally and numerically demonstrate the generation of square pulses without any wave-breaking in a fiber ring laser. A segment of nonzero dispersion-shifted fiber is used to increase the laser cavity length and to optimize the parameters of the laser cavity. In the experiment, the pulse width can be tuned in a wide range from 13.5 to 119.5 ns without wave-breaking while the peak power remains almost constant. The maximum single-pulse energy is up to 65.58 nJ at a pump power of 508 mW. Numerical results are in good agreement with the experimental results. Numerical results also reveal the role of cavity length and nonlinearity in generating a square pulse without pulse breakup.
060.3510 Lasers, fiber 140.3560 Lasers, ring 140.3600 Lasers, tunable 140.4050 Mode-locked lasers Chinese Optics Letters
2015, 13(10): 101401
天津大学 精密仪器与光电子工程学院 光电信息技术科学教育部重点实验室, 天津 300072
ASC(绝热孤子压缩)是获取超短脉冲的重要手段之一。提出一种基于拉曼增益辅助色散渐减光纤环镜的ASC方案。利用长度为3.0 km的线性DDF(色散渐减光纤)构成NOLM(非线性光纤环镜), 并辅以7 dB/km的分布拉曼增益, 成功将10 ps的光脉冲绝热压缩至195.3 fs, 压缩因子为51.2, 基座能量为11.61%。研究结果表明, 采用这种压缩方案既可以获得较高的压缩因子, 还能有效抑制压缩脉冲的基座。
绝热孤子压缩 色散渐减光纤 非线性光纤环镜 分布拉曼放大 ASC dispersion decreasing fiber NOLM distributed Raman amplification
天津大学精密仪器与光电子工程学院， 光电信息技术科学教育部重点实验室， 天津 300072
报道了一种新颖的全光纤超长环形腔掺铒光纤激光器。该激光器采用非线性偏振旋转(NPR)技术实现自启动锁模，除了NPR元件外，其余全部由单模光纤(SMF)元件组成。通过加入4 km的SMF构成长达4.046 km的环形腔，产生了重复频率为50.92 kHz的稳定锁模脉冲，最大平均输出功率为2.73 mW，对应的单脉冲能量为53.61 nJ。
激光器 被动锁模 非线性偏振旋转 超低重复频率
