Deformation of the signal envelope due to a strong dispersion of the refractive index in the gain region

Journal Article · Sat Feb 28 00:00:00 EST 2004 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2004V034N02ABEH002595· OSTI ID:21470471

Bukhman, N S ^[1]

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1. Samara State Architecture and Building Academy, Samara (Russian Federation)

It is shown that, when a narrow-band signal with a non-Gaussian envelope propagates in a medium with a strong dispersion, the signal envelope being distorted due to the dispersion of the gain (or) absorption in the medium. Nevertheless, the amplitude-modulated signal having a symmetric (even) intensity envelope remains the same. The propagation velocity of the 'middle point' (i.e., the symmetry centre) of the signal coincides with the real group velocity of the wave with a given carrier frequency in the medium and can be subluminal, superluminal or negative. Therefore, the concept of a real group velocity (including the superluminal or negative velocity) is also applicable in media with a strong dispersion of the gain (or absorption). (interaction of laser radiation with matter. laser plasma)

• OSTI ID: 21470471
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 34, Issue 2; Other Information: DOI: 10.1070/QE2004v034n02ABEH002595; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
AMPLITUDES
CARRIERS
FREQUENCY MODULATION
GAIN
LASER RADIATION
REFRACTIVE INDEX
SIGNAL DISTORTION
SIGNALS
SYMMETRY
VELOCITY
AMPLIFICATION
ELECTROMAGNETIC RADIATION
MODULATION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SORPTION