1 中国科学院上海光学精密机械研究所, 上海 201800
2 上海频准激光科技有限公司, 上海 201800
围绕着解决环境稳定性、自启动等主要挑战,非线性环镜锁模技术的发展脉络可概括为含有偏振控制器的非全保偏结构、双增益式全保偏八字腔结构和含有相位偏置器的全保偏九字腔结构。其中新型的九字腔非线性环镜锁模光纤激光器兼具自启动性能好、环境稳定性高、结构简单、成本低廉等特点,在光学频率梳、太赫兹抽运源以及工业材料微加工等领域有着良好的应用前景。
激光器 超快光纤激光器 非线性环路反射镜锁模 相位偏置技术 锁模自启动
江苏师范大学 物理与电子工程学院 江苏省先进激光技术与新兴产业协同创新中心 江苏省先进激光材料与器件重点实验室, 江苏 徐州 221116
超快光纤激光器已成为超短脉冲光源的理想选择对象并得到实际应用。由于光束直径受限于光纤截面及光与光纤的长相互作用距离, 非线性效应不可避免。在非线性效应导致的脉冲分裂出现之前, 在合适的条件下超快光纤激光器可以实现输出的周期分岔。周期分岔是指输出脉冲的参数以腔长的倍数为固定周期重复出现。周期分岔是非线性系统的本征特性之一, 广泛存在于所有非线性系统中。文中对超快光纤激光器中的周期分岔的研究进展进行了详细综述, 重点分析了不同色散区间周期分岔的表征特性, 并对矢量孤子的周期分岔特性, 以及多脉冲情况下的周期分岔特性进行讨论。
周期分岔 超快光纤激光器 非线性效应 period doubling bifurcation ultrafast fiber lasers nonlinear effect 红外与激光工程
2018, 47(8): 0803002
Author Affiliations
Abstract
1 The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
2 Department of Physics, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Efficient high harmonics generation (HHG) was demonstrated at 10 MHz repetition rate with an external femtosecond enhancement cavity, seeded by a $｛\sim｝70~\text｛fs｝$ post-compressed 10 MHz fiber chirped pulse amplifier (FCPA) laser. Operation lasting over 30 min with 0.1 mW outcoupled power at 149 nm was demonstrated. It was found that shorter pulse was beneficial for alleviating the nonlinear plasma effect and improving the efficiency of HHG. Low finesse cavity can relax the plasma nonlinearity clamped intra-cavity power and improve the cavity-locking stability. The pulse duration is expected to be below 100 fs for both 1040 nm and 149 nm outputs, making it ideal for applications such as time-resolved photoemission spectroscopy.
enhancement cavity high harmonics generation ultrafast fiber lasers. High Power Laser Science and Engineering
2018, 6(2): 02000e19
