High-resolution GaP terahertz spectrometer and its application to detect defects in gamma-irradiated glucose crystal

Jun Ichi Nishizawa, Tetsuo Sasaki, Ken Suto, Masahiko Ito, Takashi Yoshida, Tadao Tanabe

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

We developed high-resolution GaP THz signal generator using Cr:Forsterite lasers with gratings as both a pump and a signal beam for difference-frequency generation. A line width of less than 500 MHz and a wide tunable frequency range (0.6-6.2 THz) provide sufficient resolution for measuring materials with sharp absorption bands using the generator as the light source for a THz spectrometer. This is suitable for materials such as gases or solid samples at low temperatures. We demonstrated the detection of defects in organic materials, as they appear as slight deviations in the absorption frequency in the THz region.

Original languageEnglish
Pages (from-to)291-297
Number of pages7
JournalInternational Journal of Infrared and Millimeter Waves
Volume29
Issue number3
DOIs
Publication statusPublished - 2008 Mar
Externally publishedYes

Keywords

  • Cr:forsterite laser
  • Defect
  • GaP
  • Spectroscopy
  • Terahertz wave

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Electrical and Electronic Engineering

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