Terahertz quartz enhanced photo-acoustic sensor

A quartz enhanced photo-acoustic sensor employing a single-mode quantum cascade laser emitting at 3.93 Terahertz (THz) is reported. A custom tuning fork with a 1 mm spatial separation between the prongs allows the focusing of the THz laser beam between them, while preventing the prongs illumination....

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Veröffentlicht in:Applied physics letters 2013-07, Vol.103 (2)
Hauptverfasser: Borri, S., Patimisco, P., Sampaolo, A., Beere, H. E., Ritchie, D. A., Vitiello, M. S., Scamarcio, G., Spagnolo, V.
Format: Artikel
Sprache:eng
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Zusammenfassung:A quartz enhanced photo-acoustic sensor employing a single-mode quantum cascade laser emitting at 3.93 Terahertz (THz) is reported. A custom tuning fork with a 1 mm spatial separation between the prongs allows the focusing of the THz laser beam between them, while preventing the prongs illumination. A methanol transition with line-strength of 4.28 × 10−21 cm has been selected as target spectroscopic line. At a laser optical power of ∼ 40 μW, we reach a sensitivity of 7 parts per million in 4s integration time, corresponding to a 1σ normalized noise-equivalent absorption of 2 × 10−10 cm−1W/Hz½.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4812438