中国激光, 2018, 45 (8): 0801007, 网络出版: 2018-08-11
非线性放大环形镜被动锁模光纤激光器重复频率精确锁定研究 下载: 1241次
Repetition Rate Precision Lock of Nonlinear Amplifying Loop Mirror Passively Mode-Locked Fiber Laser
激光器 光纤激光器 非线性放大环形镜 非线性折射率 重复频率锁定 超快激光 lasers fiber laser nonlinear amplifying loop mirror nonlinear refractive index repetition rate locking ultrafast lasers
摘要
采用共振增强式非线性折射率调制技术实现了非线性放大环形镜锁模掺镱全保偏光纤激光器重复频率的精确锁定。通过在激光器非线性环内加入一个能提供线性相移的非互易性元件,有效减小了锁模脉冲的抽运阈值。进一步优化激光器的锁模抽运功率和控制光纤非线性折射率的抽运功率,可使激光器直接输出的最短脉冲为590 fs,重复频率为20.48 MHz,重复频率峰-峰值的波动范围小于0.4 mHz,相应的标准偏差为0.1 mHz。
Abstract
High precision repetition rate stabilization is realized in an all polarization-maintaining nonlinear amplifying loop mirror (NALM) mode-locked Yb-fiber laser. An additional Er-fiber is added in the nonlinear loop to control the optical length by the resonance-enhanced nonlinearity modulation technique. Moreover, an integrated nonreciprocal device with linear phase shift effectively reduces the mode-locking threshold. By optimizing both the pump power from two laser diodes for mode locking and the nonlinear refractive index modulating, we can obtain the shortest pulse of 590 fs and repetition rate of 20.48 MHz, the peak-to-peak fluctuation of repetition rate is less than 0.4 mHz, and the corresponding standard deviation is 0.1 mHz.
杨松, 郝强, 曾和平. 非线性放大环形镜被动锁模光纤激光器重复频率精确锁定研究[J]. 中国激光, 2018, 45(8): 0801007. Yang Song, Hao Qiang, Zeng Heping. Repetition Rate Precision Lock of Nonlinear Amplifying Loop Mirror Passively Mode-Locked Fiber Laser[J]. Chinese Journal of Lasers, 2018, 45(8): 0801007.