We demonstrate a Kerr lens mode-locked folded cavity using a planar (non-Brewster) Ti:sapphire crystal as a gain and Kerr medium, thus cancelling the nonlinear astigmatism caused by a Brewster cut Kerr medium. Our method uses a novel cavity folding in which the intracavity laser beam propagates in two perpendicular planes, such that the astigmatism of one mirror is compensated by the other mirror, enabling the introduction of an astigmatic free, planar-cut gain medium. We demonstrate that this configuration is inherently free of nonlinear astigmatism, which in standard cavity folding needs a special power-specific compensation.
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: January 3, 2013
Manuscript Accepted: January 10, 2013
Published: February 12, 2013
Shai Yefet, Valery Jouravsky, and Avi Pe’er, "Kerr lens mode locking without nonlinear astigmatism," J. Opt. Soc. Am. B 30, 549-551 (2013)