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Self-calibrated Fourier transform spectrometer for laser-induced fluorescence spectroscopy with single-photon avalanche diode detection

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Abstract

Fourier transform spectrometers are commonly used in scientific and industrial settings because of their ability to record complete spectra with high signal-to-noise ratios. Using a single-photon avalanche diode as the detector improves the sensitivity but adds complications in laser-induced fluorescence applications related to detector saturation and acquisition time exceeding the typical scan time. Here, we report a spectrometer for the detection of laser-induced fluorescence signal together with the excitation light, and use the second harmonic signal from the excitation light to correct the phase and calibrate the spectrum, removing the need for a separate calibration source. We achieve a resolution of $0.4\;{\rm{c}}{{\rm{m}}^{- 1}}$ in the wavelength range of 1140.2 nm, and demonstrate detection of signals with powers as low as $377\,\,{\rm{fW}}$, with a noise floor of $172\,\,{\rm{fW}}/\sqrt {{\rm{c}}{{\rm{m}}^{- {{1}}}}}$.

© 2022 Optica Publishing Group

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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