摘要
波长2μm附近的激光位于大气传输窗口和水的强吸收峰,在医疗、激光雷达、材料加工以及中红外泵浦源等方面具有重要应用。掺铥光纤激光器(thulium-doped fiber laser,TDFL)是一种可在2μm波长获得高功率输出的重要光源。本文针对准连续(quasi-continuous wave,QCW)TDFL中的弛豫振荡和模间四波混频问题,通过增加偏置电流、优化增益光纤长度以及改变光纤盘绕直径等方案,优化了激光器的时域及频域输出特性,并探究了不同增益光纤结构对光纤传输模式的影响。研制的QCW-TDFL在脉宽为100μs、重复频率为1 kHz、占空比为10%的情况下,在中心波长为1939.2 nm时,实现了峰值功率为894 W、平均功率为89.4 W的输出,并获得了稳定可控的脉冲输出波形和光谱特性。
Lasers with wavelengths around 2μm are located in the atmospheric transmission window and at the strong absorption peak of water,and have important applications in medicine,light detection and ranging(LIDAR),material processing,and pump sources for mid-infrared lasers.The thulium-doped fiber laser(TDFL)stands out as a critical light source capable of delivering high power outputs at this wavelength.In this paper,to address the problems of relaxation oscillation and inter-modal four-wave mixing in a quasi-continuous wave(QCW)TDFL,the time and frequencydomain output characteristics of the laser are optimized by increasing the bias current,optimizing the length of the gain fiber,and changing the diameter of the fiber coiling,etc.The effects of different gain fiber structures on the fiber transmission modes are also investigated.The developed QCW-TDFL achieves a peak power of 894 W and an average power of 89.4 W at a central wavelength of 1939.2 nm with a pulse width of 100μs,a repetition frequency of 1 kHz and a duty cycle of 10%,and obtains stable and controllable pulse output waveform and spectral characteristics.
作者
梅雪晗
陈翔
徐港
杨元忠
张仲
雷诚
李胜
王行环
王度
MEI Xue-Han;CHEN Xiang;XU Gang;YANG Yuan-Zhong;ZHANG Zhong;LEI Cheng;LI Sheng;WANG Xing-Huan;WANG Du(The Institute of Technological Sciences,Wuhan University,Wuhan 430072,China;Wuhan Strongest Laser Technology Co.,Ltd.,Wuhan 430074,China;Department of Urology,Zhongnan Hospital of Wuhan University,Wuhan 430071,China)
出处
《红外与毫米波学报》
北大核心
2025年第2期161-167,共7页
Journal of Infrared and Millimeter Waves
基金
湖北省重点研发计划(2023BCB001)
国家自然科学基金(62075200,12374295)。
关键词
准连续光纤激光器
2μm激光光源
掺铥光纤
弛豫振荡
模间四波混频
quasi-continuous fiber laser
2μm laser source
thulium-doped fiber
relaxation oscillation
inter-modal four-wave mixing
