AUTHOR=Liu Heyan , Yang Tingting , Xu Jia , Wang Qing , Xuan Hongwen , Zhang Jinwei 

TITLE=High-power 55-fs Yb:YAG thin-disk oscillator at 200 MHz repetition rate

JOURNAL=Frontiers in Physics

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.1070826

DOI=10.3389/fphy.2022.1070826

ISSN=2296-424X

ABSTRACT=<p>High-repetition-rate ultrafast laser oscillators with high average power and short pulse duration provide excellent sources for generating optical frequency combs. Here we report a Kerr-lens mode locked Yb:YAG thin-disk oscillator delivering 203-MHz pulses at an average power of 9.4 W. A single additional nonlinear plate was inserted inside the cavity to enhance the Kerr lens effect, which leads to a substantial broadening of the mode-locked spectrum. The resultant pulse duration is 55 fs. The demonstrated oscillator combines a high repetition rate, a high average power and short pulse duration within one resonator, offering an ideal prerequisite for the optical-frequency metrology and frequency-comb spectroscopy with high signal-to-noise ratio.</p>