Thin-disk multi-pass amplifier for kilowatt-class ultrafast lasers

We report on an improved ytterbium-doped yttrium aluminum garnet thin-disk multi-pass amplifier for kilowatt-level ultrafast lasers, showcasing excellent beam quality. At a repetition rate of 800 kHz, the 6.8 ps, 276 W seed laser is amplified up to an average power of 1075 W, corresponding to a puls...

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Bibliographic Details
Published in:High power laser science and engineering 2024-01, Vol.12, Article e56
Main Authors: Xu, Sizhi, Liu, Xing, Gao, Yubo, Ou, Zuoyuan, Javed, Fayyaz, He, Xingyu, Lu, Haotian, Chen, Junzhan, Chen, Yewang, Ouyang, Deqin, Zhao, Junqing, Wu, Xu, Guo, Chunyu, Zhou, Cangtao, Lue, Qitao, Ruan, Shuangchen
Format: Article
Language:English
Subjects:
Amplifiers
Efficiency
Energy
Heat
high-power laser
kilowatt level
Lasers
Light diffraction
multi-pass amplifier
Power
Propagation
Temperature
thin-disk laser
ultrafast laser
Ultrafast lasers
YAG lasers
Ytterbium
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Summary:We report on an improved ytterbium-doped yttrium aluminum garnet thin-disk multi-pass amplifier for kilowatt-level ultrafast lasers, showcasing excellent beam quality. At a repetition rate of 800 kHz, the 6.8 ps, 276 W seed laser is amplified up to an average power of 1075 W, corresponding to a pulse energy of 1.34 mJ. The 36-pass amplifier is designed as a compact mirror array in which the beam alternately propagates between the mirrors and the disk by a quasi-collimated state. We adopted a quasi-collimated propagation to confine stray and diffracted light by the slight curvature of the disk, which enables us to achieve an outstanding extraction efficiency of up to 57% with excellent beam quality in stable laser operation at high power. The beam quality at 1075 W was measured to be M2 < 1.51. Furthermore, stability testing was demonstrated with a root-mean-square power fluctuation of less than 1.67% for 10 min.
ISSN:2095-4719
2052-3289
DOI:10.1017/hpl.2024.48