Abstract

We demonstrate a method of measuring group refractive indices (${n_{\rm g}}$) by using only a temporal waveform of a color-selective multi-pulse (CSMP) generated with a spatial-light-modulator-based optical pulse shaper. Each pulse of the CSMP is characterized by different spectral components. Thus, ${n_{\rm g}}$ of a sample can be estimated by calculating the group delay of the spectrally different pulses in the CSMP after passing through the sample. As a proof-of-concept, we measured ${n_{\rm g}}$ of a glass plate by using a CSMP. We confirmed that the measured ${n_{\rm g}}$ values were in agreement with those derived from Sellmeier’s formula with an accuracy on the order of ${{1}}{{{0}}^{- 4}}$.

© 2021 Optical Society of America

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