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Updated: Sep 11, 2025

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
Published on: July 12, 2017
Development of an ultra-compact low pulse repetition Nd:YVO4 passively mode-locked multipass resonator
Abstract:
We report the development of a high-efficiency, compact, and stable diode end-pumped low-frequency SESAM mode-locked Nd:YVO4 laser. By employing a multipass cavity, the laser delivers near-diffraction-limited mode-locked pulses with a repetition rate of 20.53 MHz, an average output power of 7.5 W, a pulse duration of 28.8 ps, and a peak power of 12.7 kW, corresponding to an optical-to-optical efficiency of 48.1% and a slope efficiency of 58.6%. The influence of curvature deviations of concave mirrors in the ultra-compact multipass cavity on mode-locking stability is analyzed. A theoretical model is established to elucidate the mechanism leading to multiple-pulsing, and by solving the rate equations, a numerical solution for suppressing higher-order harmonic mode-locking is obtained, which shows good agreement with experimental observations.
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