GROUP DELAY MEASUREMENTS OF OPTICAL-COMPONENTS NEAR 800 NM

We have used phase-locked interferometry to measure the group delay of several optical components in the spectral region 700-850 nm. Data is presented for a birefringent filter, dielectric mirror, Gires-Tournois interferometer and titanium-doped sapphire. We point out the necessity of direct measurements of the dispersion of optical components, since the dispersion of a linear filter cannot always be determined from a measurement of its absorption.