Continuous wave terahertz wave spectrometer based on diode laser pumping: Potential applications in high resolution spectroscopy

Tadao Tanabe, Srinivasa Ragam, Yutaka Oyama

研究成果: Article査読

10 被引用数 (Scopus)

抄録

We constructed a high resolution terahertz (THz) spectroscopic system with an automatic scanning control using a continuous wave (cw) THz wave generator based on difference frequency generation method by excitation of phonon-polariton mode in GaP. The pump and signals lasers were compact, tunable external cavity laser, and distributed feedback (DFB) lasers, respectively. The generated THz waves were tuned automatically by changing the temperature of the DFB laser using a system control. We present the water vapor transmission characteristics of the THz wave and also absorption spectrum of a white polyethylene in the frequency range of 1.97-2.45 THz. The spectroscopic measurements performed at an output power level of 2 nW, which was obtained with a 15-mm-long GaP crystal at 2 THz. The advantage of this cw THz spectrometer is wide frequency tuning range (0.7-4.42 THz) with an estimated linewidth of full width at quarter maximum <8 MHz and this system has a potential application in high resolution spectroscopy.

本文言語English
論文番号113105
ジャーナルReview of Scientific Instruments
80
11
DOI
出版ステータスPublished - 2009
外部発表はい

ASJC Scopus subject areas

  • 器械工学

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