激光与光电子学进展, 2018, 55 (10): 103201, 网络出版: 2018-10-14   

高功率小型光纤飞秒激光放大系统 下载: 640次

High Power Compact Fiber Femtosecond Laser Amplification System
作者单位
上海理工大学光电信息与计算机工程学院, 上海 200093
摘要
介绍一种新的高功率、便携式光纤飞秒激光系统。该系统以半导体可饱和吸收锁模光纤激光器作为种子源, 通过光纤布拉格光栅对波长进行选择。振荡器输出的种子光经过两级单模掺镱光纤、一级双包层掺镱光纤预放大后, 进入主放大系统。主放大系统采用大模场掺镱光子晶体光纤放大, 并通过控制放大过程中产生的非线性积累, 有效降低非线性效应对脉冲的影响。加入声光调制器, 使输出重复频率可调, 并通过透射式光栅对, 对输出的脉冲进行压缩, 最终获得平均功率为1.34 W、重复频率为300 kHz、工作波长为1030 nm、脉冲宽度为202 fs的激光输出, 对应单脉冲能量为4.5 μJ, 峰值功率为22 MW。整套激光系统便携、稳定、成本较低, 可以进行广泛的生产应用。
Abstract
A high power portable femtosecond fiber laser system is demonstrated. This system uses semiconductor saturable absorb mode-locked fiber laser as the seed source and selects the wavelength through the fiber Bragg grating. The seed light output by the oscillator enters the main amplifier system after being pre-amplified by two-stage single-mode ytterbium-doped fiber and first-order double-clad ytterbium-doped fiber. The main amplifier uses a large mode field of ytterbium-doped photonic crystal fiber to amplifier, and effectively reduces the effect of nonlinear effect on the pulse by controlling the nonlinear accumulation in the amplification process. An acousto-optic modulator is added to make the output repetition frequency adjustable, and the output pulse is compressed through the transmission grating to obtain the laser output. The final output has an average power of 1.34 W, a repetition rate of 300 kHz, a working wavelength of 1030 nm and a pulse duration of 202 fs, and the corresponding single pulse energy is 4.5 μJ, peak power is 22 MW. The complete laser system is portable, stable, and cost-effective, and can be widely used in production.

周锋全, 袁帅, 郭政儒, 郝强, 徐晖, 曾和平. 高功率小型光纤飞秒激光放大系统[J]. 激光与光电子学进展, 2018, 55(10): 103201. Zhou Fengquan, Yuan Shuai, Guo Zhengru, Hao Qiang, Xu Hui, Zeng Heping. High Power Compact Fiber Femtosecond Laser Amplification System[J]. Laser & Optoelectronics Progress, 2018, 55(10): 103201.

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