title: Detection of interference phase by digital computation of quadrature signals in homodyne laser interferometry.
abstract: We have proposed an approach to the interference phase extraction in the homodyne laser interferometry. The method employs a series of computational steps to reconstruct the signals for quadrature detection from an interference signal from a non-polarising interferometer sampled by a simple photodetector. The complexity trade-off is the use of laser beam with frequency modulation capability. It is analytically derived and its validity and performance is experimentally verified. The method has proven to be a feasible alternative for the traditional homodyne detection since it performs with comparable accuracy, especially where the optical setup complexity is principal issue and the modulation of laser beam is not a heavy burden (e.g., in multi-axis sensor or laser diode based systems).
authors.affiliation: Institute of Scientific Instruments of the ASCR, Kralovopolska 147, 612 64 Brno, Czech Republic. res@isibrno.cz
authors.forename: Simon
authors.initials: S
authors.lastname: Rerucha
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Buchta
authors.forename: Martin
authors.initials: M
authors.lastname: Sarbort
authors.forename: Josef
authors.initials: J
authors.lastname: Lazar
authors.forename: Ondrej
authors.initials: O
authors.lastname: Cip