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Related Concept Videos

Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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Related Experiment Video

Updated: Jul 2, 2026

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

Optical absorption measurements with parametric down-converted photons.

Zhi Zhao1, Kent A Meyer, William B Whitten

  • 1Chemical Sciences Division, Oak Ridge National Laboratory P.O. Box 2008, Oak Ridge, Tennessee 37831-6142, USA.

Analytical Chemistry
|August 30, 2008
PubMed
Summary
This summary is machine-generated.

Correlated photon detection using parametric down-conversion enhances optical absorbance measurements. This method significantly reduces errors from stray light, dark counts, and pump intensity fluctuations for more accurate results.

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Last Updated: Jul 2, 2026

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Published on: September 5, 2019

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Published on: March 22, 2019

Area of Science:

  • Quantum Optics
  • Optical Metrology

Background:

  • Single-beam optical measurements suffer from various error sources.
  • Correlated photon detection offers a potential solution to these limitations.

Purpose of the Study:

  • To investigate the application of correlated photon measurements for accurate optical absorbance determination.
  • To reduce systematic errors in optical measurements using quantum correlations.

Main Methods:

  • Utilizing photon pairs generated via spontaneous parametric down-conversion.
  • Separating down-converted photons into two distinct beams for independent detection.
  • Employing coincidence counting between detectors in each beam.

Main Results:

  • Demonstrated the ability to determine absolute detector efficiency from correlated counts.
  • Successfully measured optical absorbance with reduced errors.
  • Showcased substantial mitigation of stray light, dark counts, and pump intensity variations.

Conclusions:

  • Correlated photon detection provides a robust method for precise optical absorbance measurements.
  • This technique significantly improves accuracy by minimizing common experimental errors.
  • Parametric down-conversion based correlated photon counting is a valuable tool in optical sensing.