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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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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Laser-locked, continuously tunable high resolution cavity ring-down spectrometer.

H Pan1, C-F Cheng, Y R Sun

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China.

The Review of Scientific Instruments
|November 4, 2011
PubMed
Summary
This summary is machine-generated.

A new continuous-wave cavity ring-down spectrometer achieves sub-MHz precision using a frequency-stabilized laser sideband. This advanced spectroscopic tool precisely measures absorption lines, demonstrating its high performance for detailed gas analysis.

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Area of Science:

  • Spectroscopy
  • Laser Physics
  • Physical Chemistry

Background:

  • Cavity ring-down spectroscopy (CRDS) is a powerful technique for sensitive absorption measurements.
  • Developing high-precision, tunable light sources is crucial for advancing CRDS performance.

Purpose of the Study:

  • To construct and evaluate a continuous-wave cavity ring-down spectrometer (CW-CRDS) with sub-MHz precision.
  • To utilize the sideband of a frequency-stabilized laser as a tunable light source for high-resolution spectroscopy.

Main Methods:

  • Generated tunable laser sidebands using an electro-optic modulator (EOM) driven by radio frequency.
  • Selected the desired sideband using a resonant etalon.
  • Stabilized the carrier laser frequency to a thermo-stabilized Fabry-Perot interferometer (FPI) for high absolute frequency stability (0.2 MHz).
  • Achieved broad spectral scanning by switching FPI longitudinal modes and precise scanning by tuning the EOM's radio frequency.

Main Results:

  • Successfully built a CW-CRDS system with sub-MHz precision.
  • Demonstrated broad and precise spectral scanning capabilities.
  • Tested the spectrometer's performance by measuring an air-broadened water absorption line at 12,321 cm(-1).

Conclusions:

  • The developed CW-CRDS system, utilizing a laser sideband, offers high precision and tunable spectral scanning.
  • The spectrometer's performance is suitable for detailed spectroscopic studies of absorption lines.