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Title: In-situ characterization of femtosecond laser-induced crystallization in borosilicate glass using time-resolved surface third-harmonic generation

Coherent phonon dynamics in condensed-phase medium are responsible for important material properties including thermal and electrical conductivities. We report a structural dynamics technique, time-resolved surface third-harmonic generation (TRSTHG) spectroscopy, to capture transient phonon propagation near the surface of polycrystalline CaF{sub 2} and amorphous borosilicate (BK7) glass. Our approach time-resolves the background-free, high-sensitivity third harmonic generation (THG) signal in between the two crossing near-IR pulses. Pronounced intensity quantum beats reveal the impulsively excited low-frequency Raman mode evolution on the femtosecond to picosecond timescale. After amplified laser irradiation, danburite-crystal-like structure units form at the glass surface. This versatile TRSTHG setup paves the way to mechanistically study and design advanced thermoelectrics and photovoltaics.
Authors:
; ; ;  [1]
  1. Department of Chemistry, Oregon State University, Corvallis, Oregon 97331 (United States)
Publication Date:
OSTI Identifier:
22217804
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORON SILICATES; BOROSILICATE GLASS; CALCIUM FLUORIDES; CRYSTAL STRUCTURE; CRYSTALLIZATION; ELECTRIC CONDUCTIVITY; HARMONIC GENERATION; INFRARED SPECTRA; LASER RADIATION; LASERS; PHONONS; PHOTOVOLTAIC EFFECT; POLYCRYSTALS; PULSES; RAMAN SPECTRA; SENSITIVITY; SIGNALS; SURFACES; TIME RESOLUTION