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