The Photoexcited carrier lifetime (τ) and peak to valley transmission difference (ΔTp-v) in direct and indirect band gap crystals has been investigated by the use of single beam open and closed aperture z-scan technique using frequency doubled Nd:YAG laser. The peak to valley transmission difference (ΔTp-v) is found to be of the order of 10-2 in case of direct band gap crystals and of the order...

Z-scan technique is an effective tool for measuring the optical nonlinearity of the materials. By using this technique the measurement was made for total protein and albumin. The nonlinear refractive index of the total protein and albumin were found to vary linearly with concentration. Hence by calculating the nonlinear refractive index it is possible to measure their concentration in the sampl...

LLE Review, Volume 74 125 In the interaction of strong fields with matter, considerable interest has been shown in the development of high-efficiency frequency up-conversion of ultrashort laser pulses. One important area of interest is in ultrafast laser–solid interactions where up-conversion can lead to higher absorption due to higher-density interactions1 and to an enhancement of the pulse-in...