Fourier-transform spectrometer with a terahertz-wave parametric generator

Jun Ichi Shikata, Kodo Kawase, Tetsuo Taniuchi, Hiromasa Ito

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


A novel terahertz (THz)-wave spectrometer that combines a bright broad-band source of a laser-pumped THz-wave parametric generator (TPG) and a Martin-Puplett interferometer was developed. The TPG was based on stimulated polariton scattering via the lowest A1-symmetry mode in lithium niobate (LN). Broad-band THz-wave generation with nanosecond-pulse duration was achieved by single-pass pumping of the crystals with a Q-switched Nd:YAG laser. An array of silicon prisms was used to couple out THz waves efficiently. To optimize the output, various configurations of the LN crystals were examined. A peak power of 280 microwatts was achieved, and the spectral range extended from 30 to 120 cm-1 (0.9-3.6 THz), due to the first- and second-order Stokes scattering processes. The THz-wave spectrometer system with a nitrogen-purge unit was of tabletop size and had a maximum resolution of 0.025 cm-1 (750 MHz). THz spectroscopic data measured with the spectrometer were also presented.

Original languageEnglish
Pages (from-to)134-138
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number1
Publication statusPublished - 2002
Externally publishedYes


  • Arrayed Si-prism coupler
  • Martin-Puplett interferometer
  • Nanosecond
  • Nonlinear optics
  • Phonon polariton
  • Spectroscopy
  • Stimulated Raman scattering
  • Terahertz wave

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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