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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 12 — Jun. 15, 2012
  • pp: 2265–2267

Ultrafast continuum mid-infrared spectroscopy: probing the entire vibrational spectrum in a single laser shot with femtosecond time resolution

Carmella Calabrese, Ashley M. Stingel, Lei Shen, and Poul B. Petersen  »View Author Affiliations

Optics Letters, Vol. 37, Issue 12, pp. 2265-2267 (2012)

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Until now, ultrafast IR spectroscopy has been limited by the bandwidth of optical parametric amplifiers, typically 100400cm1. Here we present the first example of transient IR spectroscopy using a continuum laser source to probe the entire mid-IR region with ultrafast time resolution. The continuum source is based on focusing the fundamental, second harmonic, and third harmonic of 1 mJ, 25 fs, 800 nm pulses in air, generating 150fs continuum mid-IR pulses that span the frequency range of <400 to >5000cm-1 or, conversely, <2 to >25μm. We characterize the spectral and temporal properties of dicarbonylacetonato rhodium(I) in hexane. We further demonstrate the versatility of the method by measuring the very fast and broad (>1500cm-1) spectral changes following IR excitation associated with the 7-azaindole–acetic acid heterodimer in carbon tetrachloride.

© 2012 Optical Society of America

OCIS Codes
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(260.3060) Physical optics : Infrared
(320.7160) Ultrafast optics : Ultrafast technology
(320.6629) Ultrafast optics : Supercontinuum generation

ToC Category:
Ultrafast Optics

Original Manuscript: January 10, 2012
Revised Manuscript: April 16, 2012
Manuscript Accepted: April 24, 2012
Published: June 6, 2012

Carmella Calabrese, Ashley M. Stingel, Lei Shen, and Poul B. Petersen, "Ultrafast continuum mid-infrared spectroscopy: probing the entire vibrational spectrum in a single laser shot with femtosecond time resolution," Opt. Lett. 37, 2265-2267 (2012)

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