Wave-dispersed two-photon absorption
Anno: 1997
Autori: Banfi G., Fortusini D., Bellini M.
Affiliazione autori: Istituto Nazionale Fisica della Materia and Dipartimento di Elettronica, Universitá di Pavia, Pavia, 27100, Italy; European Laboratory for Nonlinear Spectroscopy, 50125 Firenze, Italy
Abstract: We report the two-photon absorption (TPA) spectrum of (Formula presented) in the wavelength range ?=0.7-1.5 µm. The TPA coefficient ß of the polycrystalline film shows a broad peak, with ߘ25 cm/GW, around 0.95 µm and drops below 3 cm/GW at ?>1.2 µm. We find that the nonlinear absorption, and also the sign of the nonlinear refraction above and below the TPA maximum, are satisfactorily accounted for by modeling the response with a two-photon state positioned at 2.58 eV.
Giornale/Rivista: PHYSICAL REVIEW B
Volume: 56 (16) Da Pagina: A: