In the cavity of a self-mode-locked (Kerr-lens mode-locked) laser, a noncircular beam experiences a nonlinear coupling between beam parameters in the x and y planes. This coupling produces a significant change in beam radii throughout the cavity and may result in more than one TEM00 cavity mode. The dramatic nature of this effect is demonstrated with the Ti:sapphire laser as an example.
© 1993 Optical Society of America
Robert E. Bridges, Robert W. Boyd, and Govind P. Agrawal, "Effect of beam ellipticity on self-mode locking in lasers," Opt. Lett. 18, 2026-2028 (1993)