4.6 Article

High-efficiency 940-and 969-nm brightness-maintaining wavelength-multiplexed LD-pumped 240-W thin-rod Yb:YAG amplifier

Journal

OPTICS LETTERS
Volume 47, Issue 8, Pages 2113-2116

Publisher

Optica Publishing Group
DOI: 10.1364/OL.454445

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Funding

  1. National Natural Science Foundation of China [62075116, 62075117]
  2. Key Technology Research and Development Program of Shandong [2019JMRH0111]
  3. Natural Science Foundation of Shandong Province [ZR2019MF039, ZR2020MF114]
  4. Foundation of Qilu Young Scholar from Shandong University

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A high-efficiency ultrafast laser amplifier based on thin-rod Yb:YAG was demonstrated, achieving >50% efficiency and the highest average power operation. Additionally, pulse compression was conducted using a chirped volume Bragg grating.
A high-efficiency ultrafast laser amplifier based on thin-rod Yb:YAG was demonstrated, featuring a 940- and 969-nm brightness-maintaining wavelength-multiplexed laser diode (LD)-pumping method. Two high-brightness LDs (940 mu and 969 nm) were spectrally combined into one beam spatially with a dichroic mirror, thus enabling twice pump power while maintaining high brightness. A maximum signal power of 240 W was obtained at a repetition rate of 1 MHz, with a power extraction efficiency (PEE) of similar to 51%. To the best of the authors' knowledge, this is the first report of >50% efficiency as well as the highest average power operating at the fundamental mode for thin-rod Yb:YAG amplifiers. The beam quality factors (M-2) of the amplified signal were measured to be 1.72 and 1.12 for the horizontal and vertical directions, respectively. A preliminary pulse compression was conducted at a signal power of 80 W with a chirped volume Bragg grating (CVBG) compressor. The compressed pulse duration was 744 fs with an average power of 66.5 W, corresponding to a compression efficiency of 83.1%. (C) 2022 Optica Publishing Group

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