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
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.
收稿日期: 2019-09-05
出版日期: 2019-11-25
:
42.50.Tx
(Optical angular momentum and its quantum aspects)
42.60.By
(Design of specific laser systems)
42.60.Jf
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
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2019, Vol. 36 
