谐波锁模类噪声方波脉冲掺铒光纤激光器的研究  

Harmonic Mode-Locked Noise-Like Rectangle Pulses in an Erbium-Doped Fiber Laser

作　　者：罗智超[1] 郑旭武 罗爱平[1] 徐文成[1] 

机构地区：[1]华南师范大学信息光电子科技学院,广东省微纳光子功能材料与器件重点实验室,广州

出　　处：《应用物理》2014年第6期107-112,共6页Applied Physics

基　　金：国家自然科学基金项目(11074078,61378036,61307058,11304101);广东省自然科学基金(S2013040016320);广州市珠江科技新星专项(2014J2200008)的支持。

摘　　要：本文对长腔“8”字型掺铒光纤激光器中产生谐波锁模方波脉冲进行了实验研究。该类型脉冲具有光滑的宽带光谱,在示波器上显示为方波脉冲,但自相关迹证实其为类噪声脉冲,即类噪声方波脉冲。实验中通过调节激光器腔内参数,如偏振控制器和泵浦功率等,获得了高达5阶的谐波锁模类噪声方波脉冲。实验结果表明,光纤激光器内产生的类噪声方波脉冲并非可以无限增大脉冲能量,而是在一定条件下会产生脉冲分裂,出现谐波锁模方波脉冲现象。研究结果有利于进一步理解类噪声方波脉冲的机理和特性。We reported on the generation of harmonically mode-locked rectangular pulses in a long cavity figure-eight fiber laser. The mode-locked spectrum was broad and smooth and its pulse profile appeared to be the rectangular shape on the oscilloscope. However, the pulse type was confirmed as noise-like pulse by an autocorrelator, namely noise-like rectangular pulse. By adjusting the laser parameters, such as polarization controllers and pump power, up to 5th harmonic mode- locked noise-like rectangular pulse was achieved. It indicates that the energy of noise-like rectangular pulse in the fiber laser cannot be increased infinitely, but it may split into multiple pulses, leading to the phenomenon of harmonically mode-locked rectangular pulse. The obtained results may be useful for enhancing the understanding of the mechanism and characteristics of noise-like rectangular pulse.

关 键 词：光纤激光器 类噪声 方波脉冲 谐波锁模 

分 类 号：TN2[电子电信—物理电子学]