Measurement of group refractive indices of glass using a color-selective multi-pulse generated with a spatial light...

We demonstrate a method of measuring group refractive indices (n) 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 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 of a glass plate by using a CSMP. We confirmed that the measured n values were in agreement with those derived from Sellmeier's formula with an accuracy on the order of 10^-4.