Abstract
In this study geometric and physical optics analyses were used to examine an HF overtone/UR90 design (OTR90). The geometric analyses were primarily used to calculate the physical optics parameters and to understand the misalignment sensitivities of the resonator. The physical optics calculations then provided information regarding output power, phase and intensity distributions, and mode control. The physical parameters used in the optical analyses were based on a rectangular resonator designed around the NACL, two-bank gain generator and facility; a likely candidate for a near-term HF overtone experiment. Also, the gain model was anchored to the small-signal gain (SSG) and spectrum of this device. These analyses show that indeed high power within a good mode can be extracted using this resonator and that the impact of mirror misalignment is greatly reduced.
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