Randomized trial develops a cryogenically cooled Yb: KGW regenerative amplifier, indicating improved beam quality.
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.
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Gu et al. (2026) studied this question.
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