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.
Terahertz quartz enhanced photo-acoustic sensor / Borri, S.; Patimisco, P.; Sampaolo, A.; Beere, H. E.; Ritchie, D. A.; Vitiello, M. S.; Scamarcio, G.; Spagnolo, Vincenzo Luigi. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 103:2(2013). [10.1063/1.4812438]
Terahertz quartz enhanced photo-acoustic sensor
Patimisco P.;SPAGNOLO, Vincenzo Luigi
2013-01-01
Abstract
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.| File | Dimensione | Formato | |
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