Applied Physics B

, Volume 100, Issue 1, pp 3–8

Mid-infrared dual-comb spectroscopy with 2.4 μm Cr2+:ZnSe femtosecond lasers

  • B. Bernhardt
  • E. Sorokin
  • P. Jacquet
  • R. Thon
  • T. Becker
  • I. T. Sorokina
  • N. Picqué
  • T. W. Hänsch
Article

DOI: 10.1007/s00340-010-4080-0

Cite this article as:
Bernhardt, B., Sorokin, E., Jacquet, P. et al. Appl. Phys. B (2010) 100: 3. doi:10.1007/s00340-010-4080-0

Abstract

The mid-infrared part of the electromagnetic spectrum is the so-called molecular fingerprint region because gases have tell-tale absorption features associated with molecular rovibrations. This region can be for instance exploited to detect small traces of environmental and toxic vapors in atmospheric and industrial applications. Novel Fourier-transform spectroscopy without moving parts, based on time-domain interferences between two comb sources, can in particular benefit optical diagnostics and precision spectroscopy. To date, high-resolution and -sensitivity proof-of-principle experiments have only been reported in the near-infrared region where frequency-comb oscillators are conveniently available. However, as most of the molecular transitions in this region are due to weak overtone bands, this spectral domain is not ideal for sensitive and rapid detection. Here we present a proof-of-principle experiment of frequency-comb Fourier-transform spectroscopy with two Cr2+:ZnSe femtosecond oscillators directly emitting in the 2.4 μm mid-infrared region. The acetylene absorption spectrum in the region of the \(\nu_{1}+\nu_{5}^{1}\) band, extending from 2370 to 2525 nm, could be recorded within a 10 μs acquisition time without averaging with 12 GHz resolution.

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • B. Bernhardt
    • 1
  • E. Sorokin
    • 2
  • P. Jacquet
    • 3
  • R. Thon
    • 3
  • T. Becker
    • 1
  • I. T. Sorokina
    • 4
  • N. Picqué
    • 1
    • 3
    • 5
  • T. W. Hänsch
    • 1
    • 5
  1. 1.Max Planck Institut für QuantenoptikGarchingGermany
  2. 2.Institut für PhotonikTU WienViennaAustria
  3. 3.Institut des Sciences Moléculaires d’OrsayCNRSOrsayFrance
  4. 4.Department of PhysicsNorwegian University of Science and TechnologyTrondheimNorway
  5. 5.Fakultät für PhysikLudwig-Maximilians-Universität MünchenMünchenGermany

Personalised recommendations