A unique laser resonator containing an internal phase grating and a diffractive mode-selecting mirror provides high modal discrimination in a Nd:YAG laser cavity. Single-spatial-mode lasers with high Fresnel numbers are possible, with negligible loss to the fundamental mode.
© 1994 Optical Society of America
James R. Leger, Diana Chen, and Kevin Dai, "High modal discrimination in a Nd:YAG laser resonator with internal phase gratings," Opt. Lett. 19, 1976-1978 (1994)