Phase Estimation in Optical Interferometry

176 ◾ Moises Padilla and Manuel Servin

5.10.1 Standard Method for Wavefront Estimation

in Lateral Shearing Interferometry

Assuming that the amount of displacement introduced in the lateral

shearing interferometer is known or can be estimated from the interfero-

gram, one must be able (in principle) to demodulate the fringe pattern in

−∩+[( ,) (,)]Px dx yPxdxy

to obtain

∆ϕ(,)xy

x

by means of Fourier demo-

dulation, linear PSAs, and any other appropriate phase demodulation pro-

cess. For more details, see, for instance, Wyant [25] and Paez, Strojnik, and

Mantravadi [26]. us, starting from some estimation of the modulating

phase

∆ϕ(,)xy

x

,

∆ϕ