Two-tint pump-probe measurements using a femtosecond laser oscillator and sharp-edged optical filters

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...

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Bibliographic Details
Published inReview of scientific instruments Vol. 79; no. 11; p. 114901
Main Authors Kang, Kwangu, Koh, Yee Kan, Chiritescu, Catalin, Zheng, Xuan, Cahill, David G
Format Journal Article
LanguageEnglish
Published United States 01.11.2008
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Summary: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.
ISSN:1089-7623
DOI:10.1063/1.3020759