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Titolo:
Near shot noise detection of oxygen in the A-band with vertical-cavity surface-emitting lasers
Autore:
Vogel, P; Ebert, V;
Indirizzi:
Univ Heidelberg, Inst Phys Chem, D-69120 Heidelberg, Germany Univ Heidelberg Heidelberg Germany D-69120 , D-69120 Heidelberg, Germany Infineon Technol, D-93049 Regensburg, Germany Infineon Technol Regensburg Germany D-93049 D-93049 Regensburg, Germany
Titolo Testata:
APPLIED PHYSICS B-LASERS AND OPTICS
fascicolo: 1, volume: 72, anno: 2001,
pagine: 127 - 135
SICI:
0946-2171(200101)72:1<127:NSNDOO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
FREQUENCY-MODULATION SPECTROSCOPY; DISTRIBUTED-FEEDBACK LASERS; SEMICONDUCTOR DIODE-LASERS; ABSORPTION; SENSORS; NM; TEMPERATURE; VCSELS; FLOWS; WATER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Ebert, V Univ Heidelberg, Inst Phys Chem, INF 253, D-69120 Heidelberg, Germany Univ Heidelberg INF 253 Heidelberg Germany D-69120 berg, Germany
Citazione:
P. Vogel e V. Ebert, "Near shot noise detection of oxygen in the A-band with vertical-cavity surface-emitting lasers", APP PHYS B, 72(1), 2001, pp. 127-135

Abstract

A dual-beam laser absorption spectrometer with balanced detection for highsensitivity detection of oxygen via the A-band at 760 nm is described. The2 x 2 vertical-cavity surface-emitting laser arrays used for this set-up are characterized by their wavelength tuning behavior with temperature and current, amplitude modulation, side-mode suppression ratio and polarization contrast. The spectrometer performance is determined over time periods of up to 10 h using the variation in the differential absorption between two beam paths. With the R1IR11 line at STP, 670 muW laser power and 200 mm-long absorption cells, we realized an excellent linearity (R = 0.9999) and over a 5-min interval a record sensitivity for VCSEL-based spectrometers of 35 ppmV, corresponding to an optical density (O.D.) of 7 x 10(-7). For this specific set-up, this sensitivity is only a factor of 2.7 above the shot noiselimit, giving us a normalized detection limit of 7.6 ppmV . m . root mW(-1) . s. Over a 10-h interval we achieved a standard deviation of 65 ppmV.

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Documento generato il 03/04/20 alle ore 10:48:55