Abstract
A simple method for controlling the spatial gain distribution in an end-pumped solid-state laser to allow the selective excitation of the fundamental Gaussian (TEM00) and the first-order Laguerre–Gaussian doughnut (LG01) modes is reported. This approach has been applied to a Nd:YAG laser yielding 2.21 W of the TEM00 mode output and 1.62 W of the LG01 mode output at 1064 nm for 7.36 W of incident pump power at 808 nm. The corresponding slope efficiencies with respect to incident pump power were 40 and 32 % for the TEM00 and LG01 modes, respectively. The underlying mechanism and the prospects for further improvement in laser performance are discussed.
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