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Opt Lett. 2008 Oct 1;33(19):2278-80.

Single higher-order transverse mode operation of a radially polarized Nd:YAG laser using an annularly reflectivity-modulated photonic crystal coupler.

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1
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan. kozawa@tagen.tohoku.ac.jp

Abstract

We demonstrate single higher-order transverse mode operation of a radially polarized Nd:YAG laser by using a polarization-selective and reflectivity-modulated output coupler. A narrow annular region with low reflectivity fabricated in a photonic crystal mirror behaves so as to select a higher-order transverse mode of a cylindrically symmetric laser beam. A double-ring-shaped radially polarized TM(02) mode beam is stably generated.

PMID:
18830377
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