High-energy 2  µm pulsed vortex beam excitation from a Q-switched Tm:LuYAG laser

We report on the first, to the best of our knowledge, direct generation of pulsed vortex beams at 2 µm from a ${ Q}$Q-switched Tm:LuYAG laser. High-energy Laguerre-Gaussian (${{\rm LG}_{0,l}}$LG ) pulsed laser beams with well-defined handedness are selectively excited through spatially matched pump...

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Bibliographic Details
Published in:Optics letters 2020-02, Vol.45 (3), p.722-725
Main Authors: Chen, Ying, Ding, Manman, Wang, Jianlei, Wang, Li, Liu, Qiyao, Zhao, Yongguang, Liu, Ying, Shen, Deyuan, Wang, Zhengping, Xu, Xinguang, Petrov, Valentin
Format: Article
Language:English
Subjects:
Angular momentum
Electron beams
Gaussian beams (optics)
Laser beams
Lasers
Optical components
Organic materials
Pulsed lasers
Q switched lasers
Skewed distributions
Vortices
Wave fronts
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Summary:We report on the first, to the best of our knowledge, direct generation of pulsed vortex beams at 2 µm from a ${ Q}$Q-switched Tm:LuYAG laser. High-energy Laguerre-Gaussian (${{\rm LG}_{0,l}}$LG ) 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 ${{\rm LG}_{0, + 1}}$LG mode and 1.51 mJ for the ${{\rm LG}_{0, - 1}}$LG 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.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.384201