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Related Experiment Video

Updated: Jul 2, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Subnanosecond time-correlated photon counting with tunable lasers.

K G Spears1, L E Cramer, L D Hoffland

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60201.

The Review of Scientific Instruments
|February 1, 1978
PubMed
Summary

We developed advanced laser techniques to enhance time-correlated photon counting. This method achieves high stability and resolution for precise fluorescence lifetime measurements in gas and liquid phases.

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Area of Science:

  • Laser Spectroscopy
  • Photophysics
  • Analytical Chemistry

Background:

  • Time-correlated photon counting (TCPC) is a crucial technique for measuring fluorescence lifetimes.
  • Existing methods face limitations in precision and stability for complex decay analysis.

Purpose of the Study:

  • To present novel laser-based methods for improving TCPC.
  • To characterize the performance of a tunable dye laser system in various timing configurations for TCPC.

Main Methods:

  • Utilized an Ar(+) laser-pumped tunable dye laser operated in acousto-optically mode-locked, cavity-dumped, and cavity-dumped-mode-locked configurations.
  • Employed a high-resolution photon counting system with a sensitive photomultiplier tube (RCA C31034).
  • Developed measurement techniques for both gas and liquid phase samples, including the fluorescent dye rose bengal.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Related Experiment Videos

Last Updated: Jul 2, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Main Results:

  • Achieved sub-nanosecond, highly stable laser pulses with identical shapes over 6 hours at 15 psec channel resolution.
  • Demonstrated wavelength-independent fluorescence detection across visible and ultraviolet ranges.
  • Successfully determined short exponential decays (as low as 50 psec) and dual exponential decays (e.g., 390 psec and 725 psec).
  • Identified photomultiplier transit time dispersion (0.8 nsec FWHM) as the primary limitation for deconvolution accuracy.

Conclusions:

  • The presented laser-based TCPC system offers significant improvements in stability and resolution.
  • The system is capable of accurately analyzing complex fluorescence decay dynamics in various phases.
  • This advancement enables more precise investigations into photophysical processes and molecular dynamics.