title: Ultrabroadband chirped pulse second-harmonic spectroscopy: measuring the frequency-dependent second-order response of different metal films.
abstract: We introduce a spectroscopic method for measuring the frequency-dependent second-order response using ultrabroadband strongly chirped laser pulses. The dispersion suppresses nonlinear frequency mixing, hence the second-order response of a material can be unambiguously retrieved. We demonstrate this method by measuring the frequency-dependent second-harmonic (SH) response of the metals gold, aluminium, silver, and copper in the wavelength range of about 900-1150 nm and compare the results to classical SH spectroscopy. The SH spectra indicate that interband transitions in the metals influence the overall nonlinear optical response.
authors.forename: Bernd
authors.initials: B
authors.lastname: Metzger
authors.forename: Lili
authors.initials: L
authors.lastname: Gui
authors.forename: Harald
authors.initials: H
authors.lastname: Giessen