A Terahertz Light Source Based on the Difference Frequency of Two CO2 Lasers and Its Application to Molecular Spectroscopy

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  • 炭酸ガスレーザー差周波型テラヘルツ光源と分子分光
  • タンサン ガス レーザーサ シュウハガタ テラヘルツ コウゲン ト ブンシ ブンコウ

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Abstract

A tunable light source in the terahertz region synthesized from two CO2 lasers and a microwave source is introduced with its principles, features, and applications to high resolution spectroscopy. This light source, called TuFIR in short, covers the frequency range from about 0.5 to 6 THz. The accuracy of the synthesized frequency of about 30 kHz enables us to study the spectral lines in the terahertz region with high accuracy comparable to those of microwave spectoscopy. Examples of the spectroscopy of molecules, radicals, and molecular ions investigated with TuFIR spectrometer are shown.

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