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Study on Beam-shaping Mirrors for Gaussian Beams at Frequency of 170GHz

This paper describes the design of irregular mirrors for Gaussian beam adjustment. The Gaussian beam incident on the mirror system has astigmatism and ellipticity. The purpose of the mirror system is to eliminate the astigmatism and ellipticity of the incident Gaussian beam, compensate the phase of the Gaussian beam, and obtain the ideal Gaussian beam at the output window. After adjustment, the vector correlation between the output Gaussian beam and the ideal Gaussian beam is 99.1%. Based on the propagation theory of Gaussian beam, the shape of the phase correction mirrors can be calculated by the phase difference between the ideal Gaussian beam and the input Gaussian beam.