AUTHOR=Zhang Guangyin , Li Ruixuan , Li Kui , Li Jie , Bai Zhenao , Fan Zhongwei 

TITLE=12-mJ 1-kHz cryogenically cooled rod Yb:YAG regenerative amplifier

JOURNAL=Frontiers in Physics

VOLUME=12

YEAR=2024

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2024.1383634

DOI=10.3389/fphy.2024.1383634

ISSN=2296-424X

ABSTRACT=<p>We report on a continuous-wave (CW) pumped cryogenically cooled rod Yb:YAG regenerative amplifier delivering uncompressed 12-mJ, 90-ps, 1030-nm pulses at a 1-kHz repetition rate. The amplifier demonstrates an efficiency of 31.7%. A symmetric cavity design was utilized to compensate for the substantial thermal lensing effect, yielding a final measured beam quality of 1.1 in both horizontal and vertical directions. After significant gain narrowing, the measured spectra exhibit a bandwidth of 0.3 nm corresponding to an approximately 5 ps transform-limited pulse.</p>