Spectrally resolved phase-shifting interferometry for accurate group-velocity dispersion measurements.
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.
Debnath
Sanjit K
SK
Applied optics Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, India.
Viswanathan
Nirmal K
NK
Kothiyal
Mahendra P
MP