Scientific article
Open access

Femtosecond broadband fluorescence upconversion spectroscopy: Spectral coverage versus efficiency

Published inReview of scientific instruments, vol. 87, no. 5, 053115
Publication date2016

Sum frequency mixing of fluorescence and ∼1300 nm gate pulses, in a thin β-barium borate crystal and non-collinear type II geometry, is quantified as part of a femtosecond fluorimeter [X.-X. Zhang et al., Rev. Sci. Instrum. 82, 063108 (2011)]. For a series of fixed phasematching angles, the upconversion efficiency is measured depending on fluorescence wavelength. Two useful orientations of the crystal are related by rotation around the surface normal. Orientation A has higher efficiency (factor ∼3) compared to B at the cost of some loss of spectral coverage for a given crystal angle. It should be used when subtle changes of an otherwise stationary emission band are to be monitored. With orientation B, the fluorescence range λF > 420-750 nm is covered with a single setting of the crystal and less gate scatter around time zero. The accuracy of determining an instantaneous emission band shape is demonstrated by comparing results from two laboratories.

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Citation (ISO format)
GERECKE, Mario et al. Femtosecond broadband fluorescence upconversion spectroscopy: Spectral coverage versus efficiency. In: Review of scientific instruments, 2016, vol. 87, n° 5, p. 053115. doi: 10.1063/1.4948932
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ISSN of the journal0034-6748

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