For a two-dimensional quasi-stadium laser diode, we demonstrate stable excitation of the lowest-order transverse ring modes by optimally designing the confocal end mirrors of the laser cavity based on extended Fox–Li mode calculations. We observe kink-free light output versus injection current characteristics and highly directional single-peak emissions corresponding to the diamond-shaped trajectory in the cavity. These results provide convincing evidence for selective excitation of the lowest-order transverse modes.
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: July 25, 2013
Revised Manuscript: September 10, 2013
Manuscript Accepted: September 16, 2013
Published: October 10, 2013
Takehiro Fukushima, Susumu Shinohara, Satoshi Sunada, Takahisa Harayama, Kenichi Arai, Koichiro Sakaguchi, and Yasunori Tokuda, "Selective excitation of lowest-order transverse ring modes in a quasi-stadium laser diode," Opt. Lett. 38, 4158-4161 (2013)