ultrashort-pulse interferometry

Large dispersive effects near the band edges of photonic crystals
A. Imhof, W.L. Vos, R. Sprik, and A. Lagendijk
Phys. Rev. Lett. 83, 2942-2945 (1999)

Kramers Kronig relations for an interferometer
R. H. J. Kop, P. de Vries, R. Sprik, and A. Lagendijk
Optics Commun. 138, 118-126 (1997)