Journal
OPTICS EXPRESS
Volume 21, Issue 13, Pages 16035-16042Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.016035
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- National Science Council of the Republic of China [NSC 101-2112-M-006-014-MY3]
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Depending on cavity configuration, a c-cut Nd:YVO4 laser by using a large-apex-angle axicon can execute azimuthally and radially polarized operations. A large-apex-angle axicon dominates and stabilizes the generation of the pattern, and expands the difference between the ordinary and extraordinary rays to generate off-axis cylindrical vector beams. When the cavity length is properly adjusted, the polarization of off-axis laser beams can exhibit a transition from azimuthal to radial polarization. The degree of polarizations can be up to 95.4% +/- 2.6% and 94% +/- 3.7% for azimuthally and radially polarized beams, respectively; and the slope efficiencies are approximately 20.5% for both polarized operations. Using two-pass-mode ray tracing, the ray generating mechanisms and divergent angles of their patterns were analyzed. (C)2013 Optical Society of America
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