Journal
OPTICS LETTERS
Volume 45, Issue 3, Pages 722-725Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.384201
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Funding
- Natural Science Foundation of Jiangsu Province [SBK2019030177]
- Alexander von Humboldt-Stiftung Foundation
- Qilu Young Scholars Program of Shandong University
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We report on the first, to the best of our knowledge, direct generation of pulsed vortex beams at 2 mu m from a Q-switched Tm:LuYAG laser. High-energy Laguerre-Gaussian (LG(0,l)) pulsed laser beams with well-defined handedness are selectively excited through spatially matched pump gain distribution and asymmetric cavity loss without using any intracavity handedness-selective optical elements. Pulse energies of 1.48 mJ for the LG(0,) (+1) mode and 1.51 mJ for the LG(0,) (-1)mode, respectively, are achieved at a repetition rate of 500 Hz. The pulsed laser beams with helical wavefronts are potentially useful for studying orbital angular momentum transformation dynamics, generation of mid-IR vortex beams, and nanostructuring of organic materials. (C) 2020 Optical Society of America
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