Unusual transverse patterns were observed in a cw-lamp-pumped Nd:YAG laser near the boundaries of the stability zones of the laser resonator. An interpretation of these patterns is given in terms of off-axis modes, which can be excited owing to spherical aberrations and astigmatism of the thermal lens and thermally induced birefringence. Additional evidence of the off-axis character of the observed modes was obtained by analysis of the temporal behavior of the observed patterns.
© 2004 Optical Society of America
Konstantin V. Volodchenko, Michael S. Kurdoglyan, Chil-Min Kim, and Gyu Ug Kim, "Observation and Investigation of Off-Axis Modes in a High-Power Nd:YAG Laser," Appl. Opt. 43, 4768-4773 (2004)