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.
Autori: | |
Titolo: | Terahertz quartz enhanced photo-acoustic sensor |
Rivista: | |
Data di pubblicazione: | 2013 |
Digital Object Identifier (DOI): | 10.1063/1.4812438 |
Handle: | http://hdl.handle.net/11589/2645 |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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