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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 12 — Jun. 15, 2012
  • pp: 2406–2408

Broadband laser enhanced dual-beam interferometry

V. V. Goncharov and G. E. Hall  »View Author Affiliations


Optics Letters, Vol. 37, Issue 12, pp. 2406-2408 (2012)
http://dx.doi.org/10.1364/OL.37.002406


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Abstract

We demonstrate a dual-beam, balanced detector approach, compatible with commercial Fourier transform infrared spectrometers that provide a single modulated output. Implemented with a near-IR mode-locked fiber laser source and an external broadband polarizing beamsplitter, the dual-beam method provides relative intensity noise reduction and real-time baseline drift cancellation. Noise levels within a factor of three above the shot noise limit (using 0.6 mW of optical power) are demonstrated for the weak second overtone of CO. The method should be particularly well suited for applications like broadband spectroscopy using a large fraction of the supercontinuum generated in a highly nonlinear fiber, and attenuated reflection spectroscopy, for which extreme pathlength enhancement is challenging.

© 2012 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(140.3500) Lasers and laser optics : Lasers, erbium
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms

ToC Category:
Spectroscopy

History
Original Manuscript: February 13, 2012
Revised Manuscript: April 29, 2012
Manuscript Accepted: May 24, 2012
Published: June 13, 2012

Citation
V. V. Goncharov and G. E. Hall, "Broadband laser enhanced dual-beam interferometry," Opt. Lett. 37, 2406-2408 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-12-2406

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