title: Spectrally resolved phase-shifting interferometry for accurate group-velocity dispersion measurements.
abstract: We report an accurate method to measure the group-velocity dispersion (GVD) of transparent materials by use of spectrally resolved phase-shifting interferometry. The GVD of silica glass slide measured using an eight-step phase-shifting algorithm agrees well with that calculated using the Sellmeier dispersion equation over the entire visible wavelength region, with a rms error of < or =0.0036 microm(-2), better than that of other measurement methods reported so far.
authors.affiliation: Applied optics Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, India.
authors.forename: Sanjit K
authors.initials: SK
authors.lastname: Debnath
authors.forename: Nirmal K
authors.initials: NK
authors.lastname: Viswanathan
authors.forename: Mahendra P
authors.initials: MP
authors.lastname: Kothiyal