Journal
CRYSTALS
Volume 13, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/cryst13101484
Keywords
vortex laser beam; annular pump; acousto-optic Q-switched; self-Raman laser
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In this study, the generation of a self-Raman vortex laser using acousto-optic modulation was achieved for the first time. Beam cleaning-up and pulse compression effects were observed, along with the successful creation of a Stokes field carrying a unitary topological charge. The vortex laser exhibited high peak power and short pulse width, making it suitable for various applications.
We report, for the first time, the generation of a 1173 nm acousto-optic Q-switched self-Raman vortex laser with an axicon-based annular pump system. A 20 mm long Nd:GdVO4 crystal was used as the self-Raman crystal. Both the fundamental field and the first-Stokes field were investigated using the respective output couplers. In comparison with both vortex fields, a noticeable beam cleaning-up effect and pulse compression were observed from the 1063 nm fundamental field to the 1173 nm first-Stokes field. A Stokes field carrying a unitary topological charge was achieved. Finally, the average output power of the first-Stokes vortex emission reached 454 mW under an incident pump power of 19.5 W, corresponding to a pulse width of 45.7 ns. It was beneficial to apply a high peak power from the Q-switched laser and self-Raman conversion to expand the applications of the vortex laser beam.
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