Abstract

We demonstrated that transverse mode can be controlled by manipulating gain distribution in a Yb:YAG ceramic thin disk. Several elongated higher order transverse modes of a Hermite–Gaussian beam were observed when a straight-line-shaped gain region was created by using a diode laser output from an optical fiber. An orthogonally crossing pair of straight-line-shaped gain regions created with an additional optical fiber output resulted in the generation of a doughnut-shaped Laguerre–Gaussian beam. This implies that easy and quick switching of Hermite–Gaussian and Laguerre–Gaussian beams is possible without mechanical handling.

© 2011 Optical Society of America

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