Abstract

We demonstrate the direct generation of a vector doughnut mode from an internal mirror He–Ne laser using the spot defect method. A circular-shaped spot defect of 30μm in diameter with low reflectivity created on the inner surface of a cavity mirror by laser ablation suppressed the oscillation of a Gaussian beam resulting in the oscillation of a doughnut beam. Polarization investigation showed that the generated beam was a vector hybrid mode.

© 2014 Optical Society of America

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