Add to BibSonomy
Abstract
Significant improvements in time-correlated single photon counting (TCSPC) Raman spectroscopy acquisition times can be achieved through exploitation of megahertz (MHz) laser repetition rates. We have developed a TCSPC Raman spectroscopy system based on a high peak power (${\gt}{40}\;{\rm W}$) pulsed laser, a high pulse repetition rate (40 MHz), a custom ${f}/{1.5}$ spectrometer, and a 512 spectral channel × 16 time bin single photon avalanche diode line sensor. We report millisecond Raman spectrum acquisition times, a peak Raman count rate of 104 kcps, and a linewidth aggregated count rate of 440 kcps with a diamond sample. This represents a three-order-of-magnitude increase in measured Raman count rate in comparison with a 104 kHz pulsed laser operating at 300 W and a four-order-of-magnitude increase over a 0.1 W pulsed laser operating at 40 MHz. A Raman-to-fluorescence ratio of 4.76 is achieved with a sesame oil sample at a 20 MHz repetition rate. Achieving high count rates and Raman-to-fluorescence ratios unlocks the potential of combined Raman/fluorescence lifetime spectroscopy for imaging and other short acquisition time applications.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Peiyuan Wang, Michael A. Steindorfer, Franz Koidl, Georg Kirchner, and Erich Leitgeb
Opt. Lett. 46(5) 937-940 (2021)
Serena Farina, Ivan Labanca, Giulia Acconcia, Alberto Ghezzi, Andrea Farina, Cosimo D’Andrea, and Ivan Rech
Opt. Lett. 47(1) 82-85 (2022)
Nikola Krstajić, Simon Poland, James Levitt, Richard Walker, Ahmet Erdogan, Simon Ameer-Beg, and Robert K. Henderson
Opt. Lett. 40(18) 4305-4308 (2015)