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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 16 — Aug. 15, 2014
  • pp: 4695–4698

Optical feedback frequency stabilized cavity ring-down spectroscopy

Johannes Burkart, Daniele Romanini, and Samir Kassi  »View Author Affiliations


Optics Letters, Vol. 39, Issue 16, pp. 4695-4698 (2014)
http://dx.doi.org/10.1364/OL.39.004695


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Abstract

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 5×1013cm1Hz1/2. 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 5×1012cm1 and a dynamic range spanning six decades. With its resonant intracavity light intensity on the order of 1kW/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.

© 2014 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(300.6190) Spectroscopy : Spectrometers
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6460) Spectroscopy : Spectroscopy, saturation

ToC Category:
Spectroscopy

History
Original Manuscript: April 18, 2014
Revised Manuscript: June 23, 2014
Manuscript Accepted: July 2, 2014
Published: August 6, 2014

Citation
Johannes Burkart, Daniele Romanini, and Samir Kassi, "Optical feedback frequency stabilized cavity ring-down spectroscopy," Opt. Lett. 39, 4695-4698 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-16-4695

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