Optical phase step method for absolute ranging interferometry using computer-generated holograms.
One main problem of an interferometric measurement is to evaluate the object distance from the interference function. One of the known methods that delivers the object phase is the phase step method. Here we introduce computer-generated holograms to realize parallel phase steps without phase modulation of the reference path.
M
M
Deininger
L
L
Wang
K
K
Gerstner
T
T
Tschudi