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Frequency-Agile, Rapid Scanning Spectroscopy for Ultrasensitive Absorption Measurements

David A. Long, Gar-Wing Truong, Kevin O. Douglass, Stephen Maxwell, Roger D. van Zee, David F. Plusquellic, Joseph T. Hodges

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We report a method for rapidly scanning a cw-laser through optical cavity resonances. This technique involves a microwave source and an electro-optic phase modulator, giving high sensitivity, wide tunability and fast acquisition rates.
DOI
10.1364/cleo_si.2013.ctu3h.6

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We introduce optical feedback frequency stabilized cavity ring-down spectroscopy (OFFS-CRDS), a near-shot-noise-limited technique that combines kilohertz resolution with an absorption detection sensitivity of 5×10(-13) cm(-1) Hz(-1/2). Its distributed feedback laser source is stabilized to a highly stable V-shaped reference cavity by optical feedback and fine-tuned by means of single-sideband modulation. The stability of this narrow laser is transferred to a ring-down (RD) cavity using a new fibered Pound-Drever-Hall (PDH) locking scheme without a dedicated electro-optic phase modulator, yielding several hundred RD events per second. We demonstrate continuous coverage of more than 7 nm with a baseline noise of 5×10(-12) cm(-1) and a dynamic range spanning six decades. With its resonant intracavity light intensity on the order of 1 kW/cm2, the spectrometer was used for observing a Lamb dip in a transition of carbon dioxide involving four vibrational quanta. Saturating such a weak transition at 160 μW input power, OFFS-CRDS paves the way to Doppler-free molecular overtone spectroscopy for precision measurements of hyperfine structures and pressure shifts.