Method for detecting performance of heterodyne detection system by using polarization degree of signal light

The invention discloses a method for detecting the performance of a heterodyne detection system by using the polarization degree of signal light, which mainly utilizes the theory of optical wave random medium transmission in atmospheric turbulence and the theory of partial coherent beam heterodyne detection to research the change of a point DoP on a receiving end axis after the signal light is transmitted by the atmospheric turbulence and the influence of the signal light on heterodyne efficiency. Theoretical results show that the value of the waist radius y-direction component of the signal light beam is adjusted to be smaller than 0.03 m, the value of the waist radius x-direction component of the signal light and the local oscillation light beam is increased, and the value of the waist radius y-direction component of the local oscillation light beam is reduced; in addition, the value of the coherence length of the signal light and the local oscillation light in the xx direction component can be increased, i