title: Low-cost, phase-shifting mechanisms for Newton-type interferometers.
abstract: Using standard optical shop equipment, it is possible to implement simple, low-cost, phase-shifting Newton interferometers sufficiently accurate for surface evaluation. The simplification of the phase-shifting mechanism is compensated with image-processing algorithms that can deal with vibrations and uneven, nonsequential steps. The results are cross-compared with a Fizeau phase-shifting interferometer to verify the effectiveness of the method.
authors.affiliation: Universidad Nacional Autonoma de Mexico, Instituto de Astronomia, Observatorio Astronomico Nacional, Ensenada B.C., Mexico. joel@astrosen.unam.mx
authors.forename: Joel
authors.initials: J
authors.lastname: Herrera
authors.forename: Esteban
authors.initials: E
authors.lastname: Luna
authors.forename: Luis
authors.initials: L
authors.lastname: Salas
authors.forename: Erika
authors.initials: E
authors.lastname: Sohn
authors.forename: Elfego
authors.initials: E
authors.lastname: Ruiz