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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

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Updated: May 28, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Top notch design for fiber-loop cavity ring-down spectroscopy.

Cathy M Rushworth1, Dean James, Jason W L Lee

  • 1Department of Chemistry, University of Oxford , Chemistry Research Laboratory, Oxford, UK.

Analytical Chemistry
|October 15, 2011
PubMed
Summary
This summary is machine-generated.

We developed a new fiber-loop cavity ring-down spectroscopy (CRDS) coupler for analyzing small liquid samples. This method significantly improves light coupling efficiency and reduces signal loss, enhancing detection limits.

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Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Analytical Chemistry

Background:

  • Fiber-loop cavity ring-down spectroscopy (CRDS) is a sensitive technique for analyzing small liquid volumes.
  • Conventional fiber-loop CRDS suffers from inefficient light coupling and high signal loss.
  • These limitations hinder the technique's sensitivity and applicability.

Purpose of the Study:

  • To develop an improved light coupling method for fiber-loop CRDS.
  • To overcome the limitations of low light coupling efficiency and high loss per pass.
  • To enhance the detection sensitivity for small-volume liquid sample analysis.

Main Methods:

  • A novel coupler was designed using a 45° reflective notch polished into a large-core-diameter (365 μm) optical fiber.
  • This coupler facilitates nearly 100% light coupling into the cavity with <4% loss per pass.
  • The method's performance was evaluated using aqueous rhodamine 6G (Rh6G) at 532 nm.

Main Results:

  • The new coupler achieved nearly 100% light coupling and <4% loss per pass.
  • Detection sensitivity improved by over an order of magnitude compared to conventional methods.
  • A detection limit of 0.11 cm⁻¹ (0.93 μM Rh6G in 19 nL) was achieved.

Conclusions:

  • The developed fiber-loop CRDS coupler significantly enhances detection sensitivity for small liquid samples.
  • This advancement overcomes key limitations of previous fiber-loop CRDS techniques.
  • The method offers a powerful tool for high-sensitivity analysis of minimal sample volumes.