Doppler-broadened fiber-laser-based NICE-OHMS – Improved detectability | Zendy

Florian M. Schmidt | Zendy; Aleksandra Foltynowicz | Zendy; Weiguang Ma | Zendy; Tomas Lock | Zendy; Ove Axner | Zendy

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Doppler-broadened fiber-laser-based NICE-OHMS – Improved detectability

Author(s) -

Florian M. Schmidt,

Aleksandra Foltynowicz,

Weiguang Ma,

Tomas Lock,

Ove Axner

Publication year - 2007

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.15.010822

Subject(s) - optics , heterodyne detection , finesse , materials science , doppler effect , laser , heterodyne (poetry) , fiber laser , detection limit , dispersion (optics) , absorption (acoustics) , wavelength , signal (programming language) , optical fiber , fabry–pérot interferometer , physics , chemistry , chromatography , astronomy , acoustics , computer science , programming language

The performance of fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) has been improved by elimination of the technical constraints that limited its first demonstration. Doppler-broadened detection of C(2)H(2) and CO(2) at ~1531 nm is demonstrated using a cavity with a finesse of 4800. Frequency and wavelength modulated detection at absorption and dispersion phase are compared and the optimum mode of detection is discussed. A minimum detectable absorption of 8 x 10-(11) cm(-1), which corresponds to a detection limit of 4.5 ppt (2 ppt.m) for C(2)H(2), was obtained for an acquisition time of 0.7 s by lineshape fitting. The linearity of the pressure dependence of the signal strengths is investigated for both C(2)H(2) and CO(2).

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