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High-power femtosecond vortices generated from a Kerr-lens mode-locked solid-state Hermite–Gaussian oscillator

Zijun Peng, Qing Wang, Hongshan Chen, Hongyu Liu, Xin Liu, Lisong Yan, and Jinwei Zhang

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Abstract

We report the generation of high-order transverse modes from a Kerr-lens mode-locked femtosecond laser. Two different orders of Hermite–Gaussian modes were realized by non-collinear pumping, which were converted into the corresponding Laguerre–Gaussian vortex modes using a cylindrical lens mode converter. The mode-locked vortex beams, with an average power of 1.4 W and 0.8 W, contained pulses as short as 126 fs and 170 fs at the first and second Hermite–Gaussian mode orders, respectively. This work demonstrates the possibility of developing Kerr-lens mode-locked bulk lasers with various pure high-order modes and paves the way for generating ultrashort vortex beams.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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