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Volume 9
Issue 12
10.3390/photonics9120926
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Communication

An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser

by
Xinmiao Zhao
,
Jingliang Liu
,
Mingming Liu
,
Ruobing Li
,
Luan Zhang
and
Xinyu Chen
*
Jilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, China
*
Author to whom correspondence should be addressed.
Photonics 2022, 9(12), 926; https://doi.org/10.3390/photonics9120926
Submission received: 30 September 2022 / Revised: 31 October 2022 / Accepted: 15 November 2022 / Published: 1 December 2022
(This article belongs to the Special Issue Vortex Beams: Fundamentals and Applications)
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Abstract

In this paper, dual tuning of orbital angular momentum (OAM) and the wavelength of a Tm:YLF vortex laser was realized by off-axis pumping and F-P etalon. The tuning of Hermite–Gaussian (HG) modes by off-axis pumping was theoretically analyzed. In the experiment, the highest 17th order HG17,0 mode was realized by off-axis pumping. The threshold power increased from 2 to 17.51 W with the increase in off-axis distance, and the curve of threshold power vs. off-axis distance was partially consistent with the theoretical simulation analysis. The Laguerre–Gaussian (LG) modes carrying OAM were produced by mode converter, and the beam quality of LG modes was good. The phase distribution of the LG modes was verified by interference. Subsequently, an F-P etalon was inserted into the resonant cavity to tune the wavelength. Finally, the OAM tuning of the vortex beam from LG1,0(OAM = −1ℏ) to LG16,0(OAM = −16ℏ) was realized, and the corresponding wavelength tuning range was from 1898–1943 nm to 1898–1937 nm.
Keywords: Tm:YLF laser; orbital angular momentum tuning; wavelength tuning; vortex laser Tm:YLF laser; orbital angular momentum tuning; wavelength tuning; vortex laser

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MDPI and ACS Style

Zhao, X.; Liu, J.; Liu, M.; Li, R.; Zhang, L.; Chen, X. An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser. Photonics 2022, 9, 926. https://doi.org/10.3390/photonics9120926

AMA Style

Zhao X, Liu J, Liu M, Li R, Zhang L, Chen X. An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser. Photonics. 2022; 9(12):926. https://doi.org/10.3390/photonics9120926

Chicago/Turabian Style

Zhao, Xinmiao, Jingliang Liu, Mingming Liu, Ruobing Li, Luan Zhang, and Xinyu Chen. 2022. "An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser" Photonics 9, no. 12: 926. https://doi.org/10.3390/photonics9120926

APA Style

Zhao, X., Liu, J., Liu, M., Li, R., Zhang, L., & Chen, X. (2022). An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser. Photonics, 9(12), 926. https://doi.org/10.3390/photonics9120926

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