Projects per year
Abstract / Description of output
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 (>40W) 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.
Original language | English |
---|---|
Pages (from-to) | 4104-4107 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 46 |
Issue number | 17 |
Early online date | 18 Aug 2021 |
DOIs | |
Publication status | Published - 1 Sept 2021 |
Fingerprint
Dive into the research topics of 'Time-Correlated Single Photon Raman Spectroscopy at MegaHertz Repetition Rates'. Together they form a unique fingerprint.Projects
- 1 Finished
-
IRC Proteus - Multiplexed 'Touch and Tell' Optical Molecular Sensing and Imaging - Lifetime and Beyond
1/01/19 → 1/06/23
Project: Research