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Applied Physics Letters / Volume 92 / Issue 2 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 92, 021121 (2008); http://dx.doi.org/10.1063/1.2827568 (3 pages)

Paraxial energy transport of a focused Gaussian beam in ruby with nondegenerate two-wave couplinglike mechanism

Feng Gao, Jingjun Xu, Guoquan Zhang, Fang Bo, and Haixu Liu

Photonics Center, College of Physics Science, Nankai University, Tianjin 300457, China and Key Laboratory of Weak Light Nonlinear Photonics (Nankai University, Tianjin 300457), Ministry of Education, China

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(Received 1 September 2007; accepted 2 December 2007; published online 17 January 2008)

Paraxial energy transport of an intensity-modulated and focused Gaussian beam is studied in ruby. Deformations of the temporal profiles are observed under different conditions and explained by the interplay among a nondegenerate two-wave couplinglike mechanism, the population oscillations, and the Fraunhofer diffraction. Experimental evidence is provided for the existence of a nondegenerate two-wave couplinglike mechanism. The self-superluminal can be observed under proper conditions. A group velocity of −83 m/s is achieved with a Gaussian-like-modulated pulse of 30 ms with background illumination. Based on these results, a method to control the group velocity of a single beam in such media is proposed.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

Fraunhofer diffraction, intensity modulation, laser beams, multiwave mixing, optical focusing, optical modulation, ruby

PACS

  • 42.60.Jf

    Beam characteristics: profile, intensity, and power; spatial pattern formation

  • 42.65.Jx

    Beam trapping, self-focusing and defocusing; self-phase modulation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2827568

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    A. V. Turukhin, V. S. Sudarshanam, M. S. Shahriar, J. A. Musser, B. S. Ham, and P. R. Hemmer, Phys. Rev. Lett. 88, 023602 (2002).

    H. Su and S. L. Chuanga, Appl. Phys. Lett. 88, 061102 (2006)APPLAB000088000006061102000001.

    M. S. Bigelow, N. N. Lepeshkin, and R. W. Boyd, Phys. Rev. Lett. 90, 113903 (2003).

    Q. Yang, J. Seo, B. Tabibi, and H. Wang, Phys. Rev. Lett. 95, 063902 (2005).

    G. Zhang, F. Bo, R. Dong, and J. Xu, Phys. Rev. Lett. 93, 133903 (2004).


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