Thermal refraction focusing in planar index-antiguided lasers is investigated both theoretically and experimentally. An analytical model based on zero-field approximation is presented for treating the combined effects of index antiguiding and thermal focusing. At very low pumping power, the mode is antiguided by the amplifier boundary, whereas at high pumping power it narrows due to thermal focusing. Theoretical results are in reasonable agreement with experimental data.
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: December 28, 2012
Revised Manuscript: January 31, 2013
Manuscript Accepted: February 14, 2013
Published: March 13, 2013
Lee W. Casperson, Adam Dittli, and Tsing-Hua Her, "Thermal refraction focusing in planar index-antiguided lasers," Opt. Lett. 38, 929-931 (2013)