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Updated: Jan 28, 2026

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
Published on: May 18, 2011
The spectral background problem of portable fiber Raman instruments and a solution for the on-site detection of
Haibo Li1, Yuejiao Gu2, Gan Li1
1Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621907, People's Republic of China.
Abstract:
High sensitivity and low spectral background of the Raman instruments are essential for the analysis of weak Raman-active samples. The design of the present portable fiber Raman probes leads to an interferential background that limits the application of the portable Raman technique in many situations. In this work, the spectral backgrounds of commercial probes with different optical configurations were analyzed, and the results indicated the backgrounds arose from the objective lenses and the dichroic filters. A universal solution was proposed, and a flat and clean background was achieved by utilizing the longpass optical configuration and an off-axis parabolic mirror. Combined with a high-throughput spectrometer with a research-grade CCD, this portable Raman equipment was successfully applied to identify the corrosion products on the surface of uranium (with extremely weak Raman signals). The developed portable Raman instrument with high sensitivity and low background is anticipated to be very useful for the on-site Raman detection of weak signals.
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