title: Distinct broadband third-harmonic generation on a thin amorphous medium-air interface.
abstract: We achieve a series of distinct broadband third-harmonic generation (THG) signals at the amorphous glass-air interface attributed to third-order and cascaded third-order nonlinear processes. A novel THG laser sideband arises from cascaded interaction between fundamental pulses and the cascaded four-wave mixing signals. The spatially separated THG sidebands with distinct spectral profiles manifest femtosecond quantum beats. Using a versatile setup with two crossing near-IR pulses temporally delayed to each other, we design an incident pulse polarization control method on the THG sideband lasers and also acquire the low-frequency surface Raman spectrum of the amorphous medium.
authors.affiliation: Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA.
authors.forename: Weimin
authors.initials: W
authors.lastname: Liu
authors.forename: Liang
authors.initials: L
authors.lastname: Wang
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Han
authors.forename: Chong
authors.initials: C
authors.lastname: Fang