@article { ISI:000423724300006,
	title = {Mid-infrared two-photon absorption in an extended-wavelength InGaAs photodetector},
	journal = {APPLIED PHYSICS LETTERS},
	volume = {112},
	number = {4},
	year = {2018},
	month = {JAN 22},
	publisher = {AMER INST PHYSICS},
	type = {Article},
	address = {1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA},
	abstract = {We investigate the nonlinear optical response of a commercial extended-wavelength In0.81Ga0.19As uncooled photodetector. Degenerate two-photon absorption in the mid-infrared range is observed using a quantum cascade laser emitting at lambda = 4.5 lm as the excitation source. From the measured twophoton photocurrent signal, we extract a two-photon absorption coefficient beta((2)) = 0.660.2 cm/ MW, in agreement with the theoretical value obtained from the E-g(-3) scaling law. Considering the wide spectral range covered by extended-wavelength InxGa1-xAs alloys, this result holds promise for applications based on two-photon absorption for this family of materials at wavelengths between 1.8 and 5.6 mu m. Published by AIP Publishing.},
	issn = {0003-6951},
	doi = {10.1063/1.5018619},
	author = {Piccardo, Marco and Noah A. Rubin and Meadowcroft, Lauren and Chevalier, Paul and Yuan, Henry and Kimchi, Joseph and Federico Capasso}
}
