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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...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...

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Related Experiment Video

Updated: Jun 20, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Continuously tunable CH3F Raman far-infrared laser.

P Mathieu1, J R Izatt

  • 1Département de Physique et Laboratoire de Recherche en Optique et Laser, Université Laval, Québec GiK 7P4, Canada.

Optics Letters
|August 25, 2009
PubMed
Summary
This summary is machine-generated.

Researchers generated tunable far-infrared laser pulses using methyl fluoride (CH(3)F) and a carbon dioxide (CO(2)) laser. This breakthrough enables quasi-continuous tuning across a wide spectral range for advanced applications.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Molecular Spectroscopy

Background:

  • Far-infrared (FIR) lasers are crucial for spectroscopy and material science.
  • Generating tunable FIR radiation has been a long-standing challenge in laser physics.

Purpose of the Study:

  • To develop a novel method for producing tunable far-infrared laser pulses.
  • To investigate the potential of methyl fluoride (CH(3)F) as a gain medium for FIR lasers.

Main Methods:

  • Utilizing a multiatmosphere, continuously tunable carbon dioxide (CO(2)) laser as the pump source.
  • Employing methyl fluoride (CH(3)F) as the active medium for laser generation.
  • Achieving laser action via two-photon (Raman) transitions within the CH(3)F nu(3) band.

Main Results:

  • Successfully generated approximately 0.2-mJ far-infrared laser pulses.
  • Achieved quasi-continuous tuning over approximately 85% of the 220–400 micrometer range.
  • Demonstrated the efficacy of CO(2) laser pumping for CH(3)F FIR laser action.

Conclusions:

  • The developed technique provides a highly tunable FIR laser source.
  • This method opens new possibilities for spectroscopic studies in the far-infrared region.
  • The results highlight the potential of molecular gases for efficient FIR laser generation.