Abstract
The two-photon absorption coefficient β of intrinsic InSb and the three-photon absorption coefficient γ of doped InSb were measured with high-intensity picosecond CO2 laser pulses. The picosecond duration permitted the determination of the multiphoton absorption coefficients without interference from carrier recombination and diffusion. Moreover, free-carrier absorption was made use of explicitly to enhance the absorption of the laser beam, permitting a more accurate measurement of these coefficients. The values of β and γ were found to be 2.5 cm/MW and 0.2 cm3/MW2, respectively. These values are compared with theoretical calculations in the literature.
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