Abstract
A novel method for designing and recording aspheric computer generated holographic optical elements for far infrared radiation has been developed. The design method is based on analytic ray-tracing procedure that exploits the minimization of the mean-squared difference of the propagation vectors between the actual output wavefronts and the desired output wavefronts. This minimization yields a solution for the aspheric grating vector. The design method is illustrated by recording and testing aspheric reflective and transmissive off-axis focussing elements for 10.6 μm wavelength having diffraction-limited performance over a broad range of incidence angles.
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