title: Two-tint pump-probe measurements using a femtosecond laser oscillator and sharp-edged optical filters.
abstract: We describe a simple approach for rejecting unwanted scattered light in two types of time-resolved pump-probe measurements, time-domain thermoreflectance (TDTR) and time-resolved incoherent anti-Stokes Raman scattering (TRIARS). Sharp edged optical filters are used to create spectrally distinct pump and probe beams from the broad spectral output of a femtosecond Ti:sapphire laser oscillator. For TDTR, the diffusely scattered pump light is then blocked by a third optical filter. For TRIARS, depolarized scattering created by the pump is shifted in frequency by approximately 250 cm(-1) relative to the polarized scattering created by the probe; therefore, spectral features created by the pump and probe scattering can be easily distinguished.
authors.affiliation: Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA. kgkang@illinois.edu
authors.forename: Kwangu
authors.initials: K
authors.lastname: Kang
authors.forename: Yee Kan
authors.initials: YK
authors.lastname: Koh
authors.forename: Catalin
authors.initials: C
authors.lastname: Chiritescu
authors.forename: Xuan
authors.initials: X
authors.lastname: Zheng
authors.forename: David G
authors.initials: DG
authors.lastname: Cahill