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Published on: August 30, 2017
Femtosecond broadband fluorescence upconversion spectroscopy: improved setup and photometric correction
1Photonics Center, College of Physical Science, Nankai University, Tianjin, China.
The Review of Scientific Instruments
|July 5, 2011
Summary
This study presents an improved fluorescence upconversion spectroscopy (FLUPS) setup for precise ultrafast spectroscopy. The enhanced system offers higher sensitivity and reduced background noise for detailed molecular dynamics studies.
Area of Science:
- Spectroscopy
- Physical Chemistry
- Ultrafast Dynamics
Background:
- Fluorescence Upconversion Spectroscopy (FLUPS) is a powerful technique for studying ultrafast molecular dynamics.
- Existing FLUPS setups face limitations in temporal resolution, sensitivity, and background noise.
- Optimizing FLUPS is crucial for advancing our understanding of transient photochemical and photophysical processes.
Purpose of the Study:
- To develop and characterize an advanced Fluorescence Upconversion Spectroscopy (FLUPS) setup.
- To improve temporal response, spectral range, and signal-to-noise ratio compared to previous designs.
- To demonstrate the system's capabilities through photometric calibration and time-resolved measurements.
Main Methods:
- Implementation of a novel FLUPS setup utilizing broadband phase matching with tilted gate pulses (1340 nm).
- Development of strategies to mitigate background noise from gate pulse harmonics.
- Photometric calibration using a series of fluorescent dyes, including Coumarin 153 in methanol.
Main Results:
- Achieved an 80 fs temporal response (fwhm) for emission in the 425-750 nm spectral range.
- Demonstrated increased sensitivity and reduced background noise compared to prior FLUPS systems.
- Reported time-dependent changes in peak position, bandwidth, and asymmetry for Coumarin 153.
Conclusions:
- The developed FLUPS setup offers superior performance for ultrafast spectroscopy.
- The enhanced sensitivity and temporal resolution enable detailed investigations of molecular excited-state dynamics.
- This work provides a robust platform for future studies in photochemistry and photophysics.
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