CW terahertz wave generation with laser diode pumping and its applications for high-resolution terahertz spectroscopy

Tadao Tanabe, Hikari Dezaki, Srinivasa Ragam, Yutaka Oyama, Jun Ichi Nishizawa

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have developed a high-resolution and continuous-wave (CW) terahertz spectroscopic system based on difference frequency generation (DFG) with an excitation of phonon-polariton in Gallium phosphide (GaP). The pump and signal near-infrared (NIR) lasers used in this system are an external cavity laser diode (ECLD) and a distributed feedback laser diode (DFB), respectively. Each line width of the NIR laser is less than 4 MHz, thus the quality factor Q of generated THz waves is more than 106. The terahertz wave frequency can be tuned automatically by changing wavelength of the DFB laser. As an example for the THz spectroscopic application for non-destructive inspection of ultra high molecular weight polyethylene (UHMWPE), we have shown terahertz spectra of UHMWPE with some degrees of deformation.

Original languageEnglish
Pages (from-to)153-157
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume74
Issue number3
DOIs
Publication statusPublished - 2010 Mar
Externally publishedYes

Keywords

  • Continuous-wave (cw)
  • Difference frequency generation (dfg)
  • Gallium phosphide (gap)
  • High-spectrul-resolution
  • Terahertz spectroscopic system
  • Ultra high molecular weight polyethylene (uhmwpe)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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