The compact Cherenkov free-electron laser operating in the terahertz spectral range is being developed. The analysis of the double-slab type optical resonator clarified the resonant frequency, the small signal gain and the saturation power of the device. One dimensional simulation code predicted a small signal gain of 6% with a 50kV/3.6mA electron beam. Saturation power was estimated to be 90mW. The out-coupling structure of the resonator was designed by using a 3D simulation code. A transmittivity 3.0% and spread angle 0.4rad was predicted.
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