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<p>We develop a diode-pumped cryogenically cooled Yb: KGd(WO<sub>4</sub>)<sub>2</sub> (Yb: KGW) crystal regenerative amplifier (RA). At 77&#xa0;K, it delivers 1.28&#xa0;mJ output pulses with 2.9&#xa0;nm spectral bandwidth and output power stability of 0.7% at a 1&#xa0;kHz repetition rate. The amplified beam demonstrates near-diffraction-limited quality, exhibiting M² factors of 1.01 and 1.01 in the horizontal and vertical directions, respectively. To our best knowledge, this is the first cryogenically cooled Yb: KGW crystal RA.</p>

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Cryogenically cooled yb: KGW regenerative amplifie

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月23日

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  • Jinwei Gu,
  • Jun Yu,
  • Zhe Zhang,
  • Zhuoran Li,
  • Yifeng Ye,
  • Qingyue Cui,
  • Han Kong,
  • Hanlin Xu,
  • Yongcheng Zhong,
  • Famei Wang,
  • Qingdian Lin,
  • Jie Xu,
  • Cangtao Zhou,
  • Shuangchen Ruan,
  • Xiaoyang Guo

摘要

We develop a diode-pumped cryogenically cooled Yb: KGd(WO4)2 (Yb: KGW) crystal regenerative amplifier (RA). At 77 K, it delivers 1.28 mJ output pulses with 2.9 nm spectral bandwidth and output power stability of 0.7% at a 1 kHz repetition rate. The amplified beam demonstrates near-diffraction-limited quality, exhibiting M² factors of 1.01 and 1.01 in the horizontal and vertical directions, respectively. To our best knowledge, this is the first cryogenically cooled Yb: KGW crystal RA.