Asynchronous pulsed-laser-excited Fourier transform Raman spectroscopy and its applications

Akira Sakamoto, Yukio Furukawa, Mitsuo Tasumi, Koji Masutani

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

An asynchronous pulsed-laser-excited Fourier transform Raman spectrophotometer based on a conventional continuous-scan interferometer has been developed. The additional assembly required for pulsed-laserexcited measurements, which consists of a pulsed Nd:YAG laser, a gate circuit, and a low-pass filter, can be attached to any conventional FTRaman spectrophotometer. The principle of the signal-processing of this method is almost the same as that of the asynchronous time-resolved Fourier transform infrared spectroscopy reported previously. This method does not require the synchronization between the Raman excitation and the sampling of the A/D converter. As an application of this method, it is demonstrated that the use of a pulsed laser and a gate circuit can give a significant increase in signal-to-noise ratios over continuous-wave measurements with the same average laser power. It is also shown that when a constant background (for example, thermal radiation from samples at high temperatures) or a long-lived background is present, the use of pulsed excitation and a gate circuit can effectively reduce the background. Moreover, pulsed excitation can be used for recording timeresolved Raman spectra by using an FT-Raman spectrophotometer. The time resolution is governed only by the width of the probe laser pulse. The potentiality of this method is demonstrated.

Original languageEnglish
Pages (from-to)1457-1461
Number of pages5
JournalApplied Spectroscopy
Volume47
Issue number9
DOIs
Publication statusPublished - 1993
Externally publishedYes

Fingerprint

Spectrophotometers
spectrophotometers
Pulsed lasers
Raman spectroscopy
pulsed lasers
Fourier transforms
Networks (circuits)
excitation
low pass filters
Lasers
Low pass filters
Heat radiation
thermal radiation
Interferometers
continuous radiation
lasers
Fourier transform infrared spectroscopy
converters
Raman scattering
YAG lasers

Keywords

  • Fourier transform Raman spectroscopy
  • Instrumentation
  • Pulsed-laser Raman excitation

ASJC Scopus subject areas

  • Spectroscopy
  • Instrumentation

Cite this

Asynchronous pulsed-laser-excited Fourier transform Raman spectroscopy and its applications. / Sakamoto, Akira; Furukawa, Yukio; Tasumi, Mitsuo; Masutani, Koji.

In: Applied Spectroscopy, Vol. 47, No. 9, 1993, p. 1457-1461.

Research output: Contribution to journalArticle

Sakamoto, Akira ; Furukawa, Yukio ; Tasumi, Mitsuo ; Masutani, Koji. / Asynchronous pulsed-laser-excited Fourier transform Raman spectroscopy and its applications. In: Applied Spectroscopy. 1993 ; Vol. 47, No. 9. pp. 1457-1461.
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