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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 19 — Sep. 15, 2008
  • pp: 15013–15023

Cavity enhanced absorption spectroscopy using a broadband prism cavity and a supercontinuum source

Paul S. Johnston and Kevin K. Lehmann  »View Author Affiliations

Optics Express, Vol. 16, Issue 19, pp. 15013-15023 (2008)

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We report the design and construction of a cavity enhanced absorption spectrometer using broadband Brewster’s angle prism retroreflectors and a spatially coherent 500 nm to > 1.75 µm supercontinuum excitation source. Using prisms made from fused silica an effective cavity reflectivity of > 99.99% at 1.064 µm was achieved. A proof of principle experiment was performed by recording the cavity enhanced absorption spectrum of the weak b-X (1←0) transition of molecular oxygen at 14529 cm-1 and the fifth overtone of the acetylene C-H stretch at 18430 cm-1. CCD frames were integrated for 150 sec and 30 sec, with 3 frames (each 100 cm-1 wide) and 1 frame (266 cm-1 wide) required to observe the O2 and C2H2 spectra, respectively. A rms noise equivalent absorption (αmin) of 7.21 × 10-8 cm-1 Hz-1/2 and 1.28 × 10-7 cm-1 Hz-1/2 with full width half maximum line widths of 0.18 cm-1 and 0.44 cm-1 were achieved for the molecular oxygen band and the acetylene overtone, respectively.

© 2008 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(140.4780) Lasers and laser optics : Optical resonators
(190.0190) Nonlinear optics : Nonlinear optics
(300.0300) Spectroscopy : Spectroscopy
(010.1030) Atmospheric and oceanic optics : Absorption

ToC Category:

Original Manuscript: July 9, 2008
Revised Manuscript: August 21, 2008
Manuscript Accepted: August 30, 2008
Published: September 9, 2008

Paul S. Johnston and Kevin K. Lehmann, "Cavity enhanced absorption spectroscopy using a broadband prism cavity and a supercontinuum source," Opt. Express 16, 15013-15023 (2008)

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