The modes of a stable laser resonator containing, near one mirror, an absorbing mask with two apertures have been calculated on the basis of scalar diffraction theory and experimentally observed in a pulsed Nd:YAG laser. The mode structure has been investigated as a function of the mask geometry, and an interpretation in terms of supermodes is provided.
© 1989 Optical Society of America
Sandro De Silvestri, Vittorio Magni, and Orazio Svelto, "Modes of resonators with mirror reflectivity modulated by absorbing masks," Appl. Opt. 28, 3684-3690 (1989)