In a coherent Doppler wind lidar detection system, heterodyne efficiency is an extremely important parameter that reflects the matching degree between local oscillator (LO) light and signal light. More generally, assuming that both the LO light and signal light are partially coherent beams based on the Gaussian–Schell model, we have derived an analytical expression for the heterodyne efficiency in the presence of tilt aberration. The expression indicates that the heterodyne efficiency not only depends on the tilt aberration but also is influenced by the beam parameters, misalignment angle, detector diameter, and wavelength. Specific examples of the variation in heterodyne efficiency with these factors are given in the simulation section. The numerical results show that if high heterodyne efficiency is required, the intensity width of the LO light does not have to be large when the intensity width of the signal light is determined; besides, setting |
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Heterodyning
Sensors
Signal detection
Signal intensity
Beam diameter
Optical engineering
LIDAR