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Large dispersion-managed broadband high-energy fiber femtosecond laser system with sub 300 fs pulses and high beam quality output
Li, Feng; Zhao, Wei; Wang, Yishan; Li, Dongjuan; Song, Dongdong; Li, Qianglong; Yang, Yang; Wen, Wenlong
作者部门光子制造系统与应用研究中心
2023-01
发表期刊OPTICS AND LASER TECHNOLOGY
ISSN0030-3992;1879-2545
卷号157
产权排序1
摘要

We experimentally demonstrate a high-energy sub 300 fs polarization maintaining fiber chirped pulse amplifi-cation (CPA) system. The preamplifier is a monolithic fiberized system that uses two cascaded temperature -assisted dispersion-tuning broadband chirped fiber Bragg gratings (CFBGs) with a reflected bandwidth of 20 nm as stretchers. To make full use of the stretcher to lower the system's nonlinearity accumulation, a homemade mode locked fiber laser with a spectral width of 14.8 nm (full width at half maximum) is selected as the seeder to offer a stretched pulse width of 1.69 ns. The main amplifier is based on a one-stage simple Yb:YAG single crystal fiber amplifier with an amplified output power of 40.6 W at a repetition rate of 200 kHz, and the beam quality is conserved in a single mode beam profile with beam quality of 1.246 and 1.142 in the horizontal direction and vertical direction, respectively. During amplification, the spectral gain narrowing effect is observed. To achieve the high-speed switch of the laser, an acoustical optical modulator (AOM) is inserted before the compressor to achieve high-speed turn-on/off control. The compressor is based on a diffraction grating pair with a groove density of 1600 line/mm to offer a dispersion match with the stretcher of the CFBGs. With the CFBG's fine-tuned capacity of second-order dispersion and higher-order dispersion, the compressed average power of 29.6 W and pulse duration of 278 fs, corresponding to a pulse energy of 148 mu J and a peak power of 532 MW with ignoring the wings of the pulse, is obtained. The beam quality is well conserved after compression, and the beam quality is 1.250 and 1.196 in the horizontal direction and vertical direction, respectively. A power fluctuation of 0.1% (root mean square) and a beam pointing drift of 8.47 mu rad/C over 8 h are realized. This high peak power and high beam quality femtosecond laser is promising in science and industrial applications.

关键词Single crystal fiber Silicate glass fiber Broadband femtosecond laser amplification
DOI10.1016/j.optlastec.2022.108653
收录类别SCI
语种英语
WOS记录号WOS:000862036300003
出版者ELSEVIER SCI LTD
引用统计
被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.opt.ac.cn/handle/181661/96159
专题光子制造系统与应用研究中心
通讯作者Li, Feng
作者单位Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China
推荐引用方式
GB/T 7714
Li, Feng,Zhao, Wei,Wang, Yishan,et al. Large dispersion-managed broadband high-energy fiber femtosecond laser system with sub 300 fs pulses and high beam quality output[J]. OPTICS AND LASER TECHNOLOGY,2023,157.
APA Li, Feng.,Zhao, Wei.,Wang, Yishan.,Li, Dongjuan.,Song, Dongdong.,...&Wen, Wenlong.(2023).Large dispersion-managed broadband high-energy fiber femtosecond laser system with sub 300 fs pulses and high beam quality output.OPTICS AND LASER TECHNOLOGY,157.
MLA Li, Feng,et al."Large dispersion-managed broadband high-energy fiber femtosecond laser system with sub 300 fs pulses and high beam quality output".OPTICS AND LASER TECHNOLOGY 157(2023).
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