Classical-wave analogs of quantum state measurement

Summary form only given. It is well-known that in the paraxial approximation, the transverse mode of an optical field of frequency /spl omega/ obeys an equation which is formally identical in structure to the Schrodinger wave equation of quantum mechanics: i /spl part//spl epsiv/(x,y,z)//spl part/z = /spl nabla//sup 2//sub tr//spl epsiv/(x,y,z)/2k - 2/spl pi//spl kappa//spl Delta//spl chi/(x,y)/spl epsiv/(x,y,z). We employ a local oscillator (LO) comprising a phase-locked super-position of a large collimated Gaussian beam and a small focused Gaussian beam to directly measure the real and imaginary parts of the correlation function.