CC BY
14LS-I-14
Generation of doughnut beam from self-Raman laser with or without optical vortex
W. Chen1, G. Zhang1
1Fujian Institute of Research on the Structure of Matter- Chinese Academy of Sciences, Crystal and laser physics, Fuzhou, China
Characterizing the very original features of annular-ring transverse spatial profile and the twist of helical phase-front with carrying well-defined amount of orbital angular momentum (OAM) per photon [1], scalar first-order Laguerre-Gaussian beam has become a subject of great interest for applications in many cutting-edge fields of optical tweezers and spanners [2], multiple degrees classical [3] quantum communications [4], super resolution spectroscopy [5] and micro-particles manipulation [6]. Diode-pumped Solid-State Lasers (DPSSLs) incorporating Stimulated Raman Scattering (SRS) provides an efficient approach to access some hard-to-reach frequency regime [7].
Here we demonstrated a proof-of-concept experiment to explore the generation of first-Stokes optical vortex beam via stimulated Raman scattering (SRS) in a solid-state laser associated with spatially-matched pump gain distribution. This scheme has been applied to a diode-pumped Nd:YVO4 self-Raman laser. Doughnut-like first-Stokes beam with or without optical vortex can be selectively excited without using any dedicated gyration selective element. The observation for phase front evolution characteristics of Stokes field confirmed that, firs-order Laguerre-Gaussian first-Stokes beam with well-determined spiral phase front trajectory can only be excited by introducing non-axial symmetric cavity loss.
References
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