Em. Zolotov et al., Differential heterodyne microscope for high resolving surface profiling: Control over parameters and optimization, LASER PHYS, 11(10), 2001, pp. 1120-1123
Sensitivity of differential heterodyne microscope to adjustment of its opti
cal scheme is investigated. Maximum aperture of photodetector is estimated
for point detector approach. The defocusing limits for probe beams are dete
rmined and the algorithm for matching the Fourier plane center with point d
etector is developed.