A small Nd:YAG laser with plano-concave resonator end pumped by a dye laser is observed to possess single Laguerre-Gauss transverse modes as the lowest-loss modes. This anomalous behavior occurs when the transverse dimension of the gain spot is much smaller than the fundamental TEM00-mode spot size of the resonator; the Laguerre-Gauss transverse-mode order varies with resonator length.
© 1990 Optical Society of America
C. J. Flood, G. Giuliani, and H. M. van Driel, "Preferential operation of an end-pumped Nd:YAG laser in high-order Laguerre-Gauss modes," Opt. Lett. 15, 215-217 (1990)