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 M2 = 29 was obtained.The experimentally obtained results were in good agreement with calculations. # 1999 Optical OCIS codes: 140.4780, 140.1340, 140.1550, 000.4430.
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