An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser
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 HG<sub>1...
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MDPI AG
2022-12-01
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| Series: | Photonics |
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| author | Xinmiao Zhao Jingliang Liu Mingming Liu Ruobing Li Luan Zhang Xinyu Chen |
| author_facet | Xinmiao Zhao Jingliang Liu Mingming Liu Ruobing Li Luan Zhang Xinyu Chen |
| author_sort | Xinmiao Zhao |
| collection | DOAJ |
| description | 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 HG<sub>17,0</sub> 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 LG<sub>1,0</sub>(OAM = <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>−</mo><mn>1</mn><mo>ℏ</mo></mrow></semantics></math></inline-formula>) to LG<sub>16,0</sub>(OAM = <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>−</mo><mn>16</mn><mo>ℏ</mo></mrow></semantics></math></inline-formula>) was realized, and the corresponding wavelength tuning range was from 1898–1943 nm to 1898–1937 nm. |
| first_indexed | 2024-03-09T15:57:46Z |
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| language | English |
| last_indexed | 2024-03-09T15:57:46Z |
| publishDate | 2022-12-01 |
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| series | Photonics |
| spelling | doaj.art-c96cb80d8626433aafeb31a7bd11ae332023-11-24T17:24:53ZengMDPI AGPhotonics2304-67322022-12-0191292610.3390/photonics9120926An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex LaserXinmiao Zhao0Jingliang Liu1Mingming Liu2Ruobing Li3Luan Zhang4Xinyu Chen5Jilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, ChinaJilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, ChinaJilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, ChinaJilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, ChinaJilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, ChinaJilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, ChinaIn 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 HG<sub>17,0</sub> 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 LG<sub>1,0</sub>(OAM = <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>−</mo><mn>1</mn><mo>ℏ</mo></mrow></semantics></math></inline-formula>) to LG<sub>16,0</sub>(OAM = <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>−</mo><mn>16</mn><mo>ℏ</mo></mrow></semantics></math></inline-formula>) was realized, and the corresponding wavelength tuning range was from 1898–1943 nm to 1898–1937 nm.https://www.mdpi.com/2304-6732/9/12/926Tm:YLF laserorbital angular momentum tuningwavelength tuningvortex laser |
| spellingShingle | Xinmiao Zhao Jingliang Liu Mingming Liu Ruobing Li Luan Zhang Xinyu Chen An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser Photonics Tm:YLF laser orbital angular momentum tuning wavelength tuning vortex laser |
| title | An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser |
| title_full | An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser |
| title_fullStr | An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser |
| title_full_unstemmed | An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser |
| title_short | An Orbital-Angular-Momentum- and Wavelength-Tunable 2 μm Vortex Laser |
| title_sort | orbital angular momentum and wavelength tunable 2 μm vortex laser |
| topic | Tm:YLF laser orbital angular momentum tuning wavelength tuning vortex laser |
| url | https://www.mdpi.com/2304-6732/9/12/926 |
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