We propose a time-domain interferometry method that circumvents the usual s
ampling rate condition. It was devised for the retrieval of fast optical re
sponse functions in low-repetition-rate experiments. Its potential temporal
dynamic range matches the spectral resolution and bandwidth requirements o
f the arbitrarily shaped spectral filters that are engraved in amorphous sp
ectral hole-burning materials. (C) 2000 Optical Society of America.