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Schematized differential transmission experimental setup: detail of the beam paths close to the sample.
The measured differential transmission at as a function of the pump-probe delay, in InP:Fe with (a), and after a vertical shift to assign a null signal at negative delays, normalized to the maximum peak height, in InP:Fe (thick line) and InP:S (thin line) with (b).
The negative differential transmission peak amplitude (at zero delay) vs the pump peak irradiance in InP:Fe (diamonds), InP:S (triangles), and InP:Zn (squares). The continuous lines are best fits using the two-photon absorption model.
Characteristics of the three samples studied: type of doping, resistivity or doping level (manufacturer data), linear optical absorption coefficient (calculated from the measured transmission, with ), and fitted two-photon absorption coefficients and .
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