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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 22 — Oct. 27, 2008
  • pp: 18379–18389

Two-photon stimulated Raman excitation of thermal laser-induced gratings in molecular gases using broadband radiation of a single laser

Dimitrii N. Kozlov, Markus C. Weikl, Johannes Kiefer, Thomas Seeger, and Alfred Leipertz  »View Author Affiliations


Optics Express, Vol. 16, Issue 22, pp. 18379-18389 (2008)
http://dx.doi.org/10.1364/OE.16.018379


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Abstract

For the first time to our knowledge, thermal laser-induced gratings (LIGs), generated via two-photon stimulated Raman excitation of pure rotational (and low-lying vibrational) transitions in molecules employing broadband radiation of a single pump laser, are observed. The efficiency of LIGs excitation using a few ns pulse duration dye laser with the spectral width of about 400 cm-1, which covers the frequency range of the characteristic rotational transitions, is experimentally investigated in a number of molecular gases (N2, CO2, C3H8) at room temperature and pressures of 0.1–5 bar. The physical mechanisms of LIG formation are discussed and comparison of the shapes of the LIG signals obtained in different gases is presented in relation to the spectra of rotational and vibrational energies of the molecules under study, as well as to the selection rules for Raman transitions.

© 2008 Optical Society of America

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(020.2070) Atomic and molecular physics : Effects of collisions
(190.0190) Nonlinear optics : Nonlinear optics
(190.5650) Nonlinear optics : Raman effect
(190.2055) Nonlinear optics : Dynamic gratings

ToC Category:
Nonlinear Optics

History
Original Manuscript: June 2, 2008
Revised Manuscript: August 6, 2008
Manuscript Accepted: August 10, 2008
Published: October 24, 2008

Citation
Dimitrii N. Kozlov, Markus C. Weikl, Johannes Kiefer, Thomas Seeger, and Alfred Leipertz, "Two-photon stimulated Raman excitation of thermal laser-induced gratings in molecular gases using broadband radiation of a single laser," Opt. Express 16, 18379-18389 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-22-18379


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