Abstract

It has been established that light can be used for imaging through a highly scattering medium like a biological tissue. Many techniques exist that rely on the fact that some of the light undergoes no or little scattering. Short optical pulses (100 fs-30 ps) can be used with various short gates to separate the first image bearing portions of the optical pulse from the scattered light which comes later. Long broadband pulses have some advantages over short pulses It was recognized that holography can be used as a gate for long laser pulses;¹ however, it requires equal light intensities in two interfering beams to have a good contrast. It is desirable to have gates with a good contrast to keep exposure levels to a minimum.

© 1992 Optical Society of America