Abstract
AbstractThe heterodyne efficiency in the optical heterodyne detection of an Airy signal field with a Gaussian local–oscillator field is analyzed with consideration of the effect of wavefront of both fields. The analysis is made for the case where both fields are normally incident on the detection plane. The beam parameters of the local oscillator field which maximizes the heterodyne efficiency are derived for given signal field. When the detection plane radius Γ0 is very large, the effect of the wavefront becomes apparent as F increases for given less aperture and as the effective aperture decreases for given F. The effect of finiteness of the detection plane on the heterodyne efficiency is investigated numerically. The maximum heterodyne efficiency is obtained when Γ0 = 1.13Fλ. The deterioration of the heterodyne efficiency in cases of oblique and off‐axis incidences of the local oscillator field is examined numerically.
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