Patent ID: 8462349
Filing Date: 2013-06-11
Classification: G01B

Abstract:
1. An apparatus that performs spatial phase shifting in an interferometer comprising: a first beam splitter for dividing a reference beam of light into a first reference beam and a second reference beam; the first beam splitter for dividing a signal beam of light into a first signal beam and a second signal beam; the first beam splitter for combining the first reference beam and the first signal beam producing a first combined beam and for combining the second reference beam and the second signal beam producing a second combined beam; a half wave plate for altering the polarization of the first combined beam and the second combined beam; a quarter wave plate for altering the polarization of the second combined beam; a second beam splitter for dividing the first combined beam into a third combined beam and a fourth combined beam and for dividing the second combined beam into a fifth combined beam and a sixth combined beam; a first pupil pusher for altering a conjugate image location and a transverse alignment of the third combined beam; a second pupil pusher for altering a conjugate image location and a transverse alignment of the fourth combined beam; and a third pupil pusher for altering a conjugate image location and a transverse alignment of the sixth combined beam.