环形铥光纤激光器中脉冲簇及其簇群的产生  

Generation of pulse bundles and bundle groups in a mode-locked Tm-doped fiber ring laser

作　　者：吴佟 黄金哲 王慕瑶 解亚男 张新陆 WU Tong;HUANG Jin-zhe;WANG Mu-yao;XIE Ya-nan;ZHANG Xin-lu(School of Physics Science and Technology,Tiangong university,Tianjin 300387,China)

机构地区：[1]天津工业大学物理科学与技术学院,天津300387

出　　处：《光电子．激光》2021年第2期209-216,共8页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61775166)资助项目。

摘　　要：本文研究了基于非线性偏振旋转锁模的铥光纤激光器中脉冲簇及脉冲簇群的产生。通过在环形腔内引入两段长度分别为100 m和350 m的SMF-28光纤来增强腔内非线性和色散,从而产生了脉宽为30~50 ns的束缚态脉冲簇。一个束缚态脉冲簇可以产生12个振幅不同但时间间隔相同的子脉冲。发现调节偏振控制器角度可以改变脉冲簇宽度以及子脉冲个数,进一步调节还可使子脉冲分离而形成脉冲簇群。脉冲簇群形成有规律间隔的准量子化分布,其分离的子脉冲脉宽为2.8 ns。实验中还产生了稳定的二次谐波锁模脉冲簇,并发现子脉冲的多种形态组合形式。The generation of pulse bundles and bundle groups are investigated in a mode-locked Thulium-doped fiber laser modulated by nonlinear polarization rotation.Stable bound pulse bundles with a duration from 30 to 50 ns are generated from the cavity in which nonlinearity and dispersion are enhanced by inserting two pieces of SMF-28 with lengths of 100 m and 350 m,respectively,into a ring cavity.One bound pulse bundle can produce up to 12 sub-pulses with varying amplitudes but the same time interval.It is found that by rotating the polarization controllers,the pulse duration and the number of sub-pulses of a bound bundle can be adjusted,furthermore,some of them can be expelled from the bundle to form a bundle group.Inside the bundle group,its distribution is regularly organized with quasi-quantized separations,where the pulse duration is 2.8 ns.Stable second harmonic mode-locking pulse bundles are generated as well.In this case,the pulse bundle is found to present a combination of multiple pulse forms.

关 键 词：脉冲簇 脉冲簇群 谐波锁模 非线性偏振旋转 

分 类 号：O436[机械工程—光学工程]