A time-resolved endoscopic sensor for the local measurement of optical coefficients of tissue

Summary form only given. We present a new sensor for the local measurement of tissue optical coefficients. In order to be less sensitive to the heterogeneous surface of the sample, we decided to perform space and time-resolved measurements rather than only space resolved measurements. We have therefore developed a bundle of monomode fibers in order to send and to collect short optical pulses. The incident pulse is generated by a Ti-sapphire mode-locked laser at 800 nm, and is filtered by a 1.5 nm bandwidth dielectric filter in order to limit group velocity dispersion in fiber. The detection is performed with a Hamamatsu M5675 synchroscan streak camera. The whole system allows a time resolution of 5 ps.