Title: Effects of free-carrier absorption on time-resolved pump-probe two-photon absorption in semi-insulating semiconductors
Abstract:Free-carrier absorption induced by picosecond pump excitation is investigated for the time-resolved pump-probe nonlinear transmission process in semi-insulating semiconductors. Time-resolved nonlinear...Free-carrier absorption induced by picosecond pump excitation is investigated for the time-resolved pump-probe nonlinear transmission process in semi-insulating semiconductors. Time-resolved nonlinear absorption measurements of 1.064 μm, 29 ps pulses with semi-insulating undoped GaAs and Ga-doped CdTe are performed. Because of very small linear absorption at 1.064 μm for Ga-doped CdTe, the effect of the nonlinear free-carrier absorption is found to be noticeable. A theoretical analysis is also made to understand the role of the free-carrier absorption and the linear absorption saturation at large positive time delays of the probe. From the fitting procedure by the theory free-carrier absorption coefficients as well as two-photon absorption coefficients for the two crystals are obtained.Read More
Publication Year: 1992
Publication Date: 1992-08-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 6
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