大模场面积光子晶体光纤耗散孤子锁模激光器  

Dissipative-soliton mode locked laser based on large-mode-area photonic crystal fiber

作　　者：张鑫[1] 胡明列[1] 宋有健[1] 柴路[1] 王清月[1] 

机构地区：[1]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

出　　处：《物理学报》2010年第3期1863-1869,共7页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2006CB806002;2010CB327604);国家高技术研究发展计划(批准号:2007AA03Z447);国家自然科学基金(批准号:60838004;60978022);高等学校博士学科点专项科研基金(批准号:20070056083;20070056073);教育部科学技术研究重点项目(批准号:108032);全国博士学位论文作者专项资金(批准号:2007B34);教育部新世纪优秀人才支持计划(批准号:NCET-07-0597)资助的课题~~

摘　　要：研制了一种基于掺Yb3+的双包层大模场面积偏振光子晶体光纤的耗散孤子锁模激光器.利用数值模拟分析了光纤激光器中耗散孤子动力学过程,与全正色散锁模激光器相比,脉冲窄化机理更加丰富,半导体可饱和吸收镜(SESAM)的非线性吸收,啁啾脉冲的光谱滤波以及光纤的增益色散同时起作用,这些因素使耗散孤子锁模更加容易实现,并且稳定运行.其中,光谱滤波的耗散过程是稳定锁模机制的主导因素,滤波片能够在频域和时域同时窄化脉冲,并且去除脉冲啁啾,限制脉冲在腔内始终小于1ps.在实验上实现了无色散补偿腔中直接输出脉冲宽度777fs,最高平均功率达到1W,重复频率48·27MHz,对应单脉冲能量20nJ的飞秒激光.A dissipative-soliton mode locked laser based on Yb-doped single polarization large-mode-area photonic crystal fiber is demonstrated. The dissipative soliton dynamics is explored by numerical simulation. Compared with all normal dispersion fiber lasers, there are more pulse shaping mechanisms in a dissipative-soliton fiber laser, including the nonlinear absorption of SESAM, spectrum filtering of the chirped pulse and gain dispersion, which results in robust and stable operation. Among them, spectrum filtering plays a dominant role in mode-locking, it shapes pulse both in frequency domain and time domain and keeps the pulse duration below 1 ps in the cavity. For the first time, sub-1 ps pulse is directly generated in a dispersion compensation free cavity. The fiber laser directly generates 777 fs pulse at 1 W average power at a repetition rate of 51.4 MHz, corresponding to a single pulse energy of 20 nJ.

关 键 词：光子晶体光纤 大模场面积光纤 光纤激光器 耗散孤子锁模 

分 类 号：TN248[电子电信—物理电子学]