Effects of small misalignments in positive- and negative-branch strip confocal unstable resonators have been compared at the same absolute values of collimated Fresnel numbers and at the same Fresnel numbers. We show that positions of beam modes in negative-branch unstable resonators are far less sensitive to misalignment because of both geometric features and diffraction effects of beam flipping in the resonators.
© 2001 Optical Society of America
Koji Yasui and Yushi Takenaka, "Advantages of Negative-Branch Compared with Positive-Branch One-Dimensional Unstable Resonators," Appl. Opt. 40, 3547-3551 (2001)