Journal
OPTICS LETTERS
Volume 48, Issue 10, Pages 2708-2711Publisher
Optica Publishing Group
DOI: 10.1364/OL.492186
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We have successfully generated high-order transverse modes from a Kerr-lens mode-locked femtosecond laser by non-collinear pumping. The generated modes were converted into Laguerre-Gaussian vortex modes using a cylindrical lens mode converter. This work demonstrates the potential of developing Kerr-lens mode-locked bulk lasers with various pure high-order modes and opens up possibilities for generating ultrashort vortex beams.
We report the generation of high-order transverse modes from a Kerr-lens mode-locked femtosecond laser. Two dif-ferent 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, con-tained 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. (c) 2023 Optica Publishing Group
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