OPTICAL DISPLACEMENT SENSOR WITH FREQUENC Y-SELECTIVE SQUEEZING OF THE VACUUM NOISE

Electromechanical analogies are used to derive expressions for the ele ctromechanical Z parameters and for the energy spectra of external sou rces of noise in an lf equivalent of an optical displacement sensor wi th frequency-selective squeezing of the vacuum noise. The minimum nois e temperature of the sensor is estimated. The use of squeezed vacuum f luctuations can improve the noise matching of the sensor system and he lp to achieve the minimum noise temperature even for a nonoptimal rela tionship between the parameters of the system.