Fluorescence suppression in Raman spectroscopy using a time-gated CMOS SPAD

Juha Kostamovaara (Corresponding Author), Jussi Tenhunen, Martin Kögler, Ilkka Nissinen, Jan Nissinen, Pekka Keränen

    Research output: Contribution to journalArticleScientificpeer-review

    129 Citations (Scopus)

    Abstract

    A Raman spectrometer technique is described that aims at suppressing the fluorescence background typical of Raman spectra. The sample is excited with a high power (65W), short (300ps) laser pulse and the time position of each of the Raman scattered photons with respect to the excitation is measured with a CMOS SPAD detector and an accurate time-to-digital converter at each spectral point. It is shown by means of measurements performed on an olive oil sample that the fluorescence background can be greatly suppressed if the sample response is recorded only for photons coinciding with the laser pulse. A further correction in the residual fluorescence baseline can be achieved using the measured fluorescence tails at each of the spectral points.
    Original languageEnglish
    Pages (from-to)31632-31645
    JournalOptics Express
    Volume21
    Issue number25
    DOIs
    Publication statusPublished - 6 Dec 2013
    MoE publication typeA1 Journal article-refereed

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