78fs全光纤环形腔被动锁模飞秒激光器  

78 fs all-fiber ring cavity passive mode-locked femto-second laser

作　　者：沈世奎[1] 左林[1] 杨爱英[1] 宁春梅[1] 孙雨南[1] 

机构地区：[1]北京理工大学光电学院,北京100081

出　　处：《红外与激光工程》2011年第8期1448-1452,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(60777024;60978007)

摘　　要：为满足全光采样系统对低时域抖动、窄脉冲宽度和高重复频率飞秒光纤激光器的需求,结合数值仿真,在实验的基础上利用非线性偏振旋转锁模原理,初步实现了自由运转被动锁模掺铒飞秒光纤激光器,激光器锁模输出脉冲的基本重复频率为6.028 MHz,平均输出功率为1.07 mW,中心波长为1 570.3 nm,光谱宽度为33.2 nm,理论推算出傅里叶变换受限脉冲的时域宽度为78 fs;通过增大输出耦合器的分束比,可以提高锁模输出脉冲的平均功率;同时,测量了锁模脉冲基本重复频率的稳定性。该激光器的操作和调节简单,在锁模情况下能够长时间稳定运行,其全光纤结构更有利于小型化和便携化。All-optical sampling system needs femto-second fiber laser with low time jitter, narrow pulse width and high repetition rate as sampling pulse source. Based on the numerical simulation, passively mode-locked erbium-doped femto-second fiber laser was demonstrated via nonlinear polarization rotation （NPR） effect. The fundamental repetition rate of the fiber laser was 6.028 MHz, the average output optical power was 1.07 mW, the central wavelength was 1 570.3 nm, and the spectral width was 33.2 nm, the corresponding Fourier transform limited pulse width of 78 fs was calculated. The average output optical power could be improved by increasing the coupling-ratio of the output optical coupler in the allfiber cavity. The stability of the fundamental repetition rate of the laser was also measured. The femtosecond laser is simple and easy to operate. Furthermore, the laser is compact and portable for the all fiber cavity structure.

关 键 词：全光采样 飞秒脉冲 非线性偏振旋转 被动锁模掺铒光纤激光器 

分 类 号：TN248[电子电信—物理电子学]