Open AccessUltraviolet intracavity frequency-doubled Pr3+:LiYF4 orbital Poincaré laser
Author(s) -
A.S. Rao,
Katsuhiko Miamoto,
Takashige Omatsu
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.411624
Subject(s) - optics , physics , superposition principle , angular momentum , laser , optical vortex , ultraviolet , atomic physics , beam (structure) , quantum mechanics
Here we demonstrate intracavity frequency-doubling of an ultra-compact (cavity length < 20 mm) Pr 3+ :LiYF 4 (YLF) orbital Poincaré laser, in which the fundamental modes are represented on an equivalent orbital Poincaré sphere (eOPS) and a singularities hybrid evolution nature sphere (SHENS). The generated ultraviolet (UV, 320 nm) output carries orbital angular momentum (OAM), and it typically exhibits an optical bottle beam with a 3-dimensional dark core, formed of a coherent superposition of eigen Laguerre-Gaussian (LG) modes. Such ultraviolet structured light beams with OAM offer many advanced applications from microscopy to materials processing.