FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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A V-Folded Digital Laser for On-Demand Vortex Beams by Astigmatic Transformation of Hermite–Gaussian Modes |
Sen-Sen Liu, Xu-Dong Chen**, Ji-Xiong Pu, Zhi-Li Lin, Zi-Yang Chen |
Fujian Key Laboratory of Light Propagation and Transformation, College of Information Science and Engineering, Huaqiao University, Xiamen 361021
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Cite this article: |
Sen-Sen Liu, Xu-Dong Chen, Ji-Xiong Pu et al 2019 Chin. Phys. Lett. 36 124203 |
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Abstract A V-folded digital laser using a spatial light modulator (SLM) for intra-cavity loss shaping is exploited to generate Hermite–Gaussian modes with on-demand mode order. With a $\pi$/2 astigmatic mode converter, vortex beams carrying on-demand orbital angular momentum (OAM) with a tunable range from $-11\hbar$ to $12\hbar$ are obtained. The mode order of the HG mode, hence the OAM of the vortex beam, is digitally switched by changing the phase pattern imposed on the SLM without requiring any mechanic alignment of the cavity. This work has great potential applications in various OAM-tunable vortex beams.
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Received: 05 September 2019
Published: 25 November 2019
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PACS: |
42.50.Tx
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(Optical angular momentum and its quantum aspects)
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42.60.By
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(Design of specific laser systems)
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42.60.Jf
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(Beam characteristics: profile, intensity, and power; spatial pattern formation)
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Fund: Supported by the National Natural Science Foundation of China under Grant Nos 61605049 and 61575070, and the Natural Science Foundation of Fujian Province of China under Grant No 2018J01003, the Fundamental Research Funds for the Central Universities under Grant No ZQN-707, and the Subsidized Project for Postgraduates' Innovative Fund in Scientific Research of Huaqiao University. |
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