An optical resonator simulation code based on the idea of a partially coherent optical field has been developed and used to optimize the design parameters of an unstable resonator with a stable core. The resonator was intended for use with low-gain, large-bore lasers, such as the chemical oxygen–iodine laser (COIL). First the design parameters of the resonator were optimized by the simulation code; then a set of mirrors was fabricated for a small-scale COIL. A 14-W output with <i>M</i><sup>2</sup> = 29 was obtained. The experimentally obtained results were in good agreement with calculations.
© 1999 Optical Society of America
(000.4430) General : Numerical approximation and analysis
(140.1340) Lasers and laser optics : Atomic gas lasers
(140.1550) Lasers and laser optics : Chemical lasers
(140.4780) Lasers and laser optics : Optical resonators
Masamori Endo, Masataka Kawakami, Kenzo Nanri, Shuzaburo Takeda, and Tomoo Fujioka, "Two-Dimensional Simulation of an Unstable Resonator with a Stable Core," Appl. Opt. 38, 3298-3307 (1999)