Pattern formation in large-aspect-ratio single-mode inhomogeneously broadened lasers

Journal Article · Wed Dec 01 04:00:00 EST 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.063808· OSTI ID:20650000

Cabrera, Eduardo; Calderon, Oscar G; Guerra, J M ^[1]

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1. Departamento de Optica, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid (Spain)

Pattern formation in large-aspect-ratio single-mode inhomogeneously broadened lasers is studied by means of the integro-differential Maxwell-Bloch equations. As the inhomogeneous linewidth increases, the neutral stability curve shows a relaxation in the traveling wave selection allowing structures with different sizes to grow. We have performed numerical simulations with a simplified model based on a few discrete groups of atoms at different resonant frequencies to observe transverse dynamics above threshold for good and bad cavity configurations. We obtain, in general, that close to threshold the inhomogeneous broadening leads to a more complex pattern in comparison to the homogeneous broadening case. At higher pumpings, a stabilization in the number of spatial frequencies taking part in the transverse pattern is found. The influence of the laser aperture on temporal dynamics is also studied. It is shown how the typical self-pulsing regime present in single-mode inhomogeneously broadened lasers is destroyed for a wide enough aperture.

• OSTI ID: 20650000
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
APERTURES
ASPECT RATIO
ATOMS
BLOCH EQUATIONS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
INTEGRO-DIFFERENTIAL EQUATIONS
LASER CAVITIES
LASERS
OPTICAL PUMPING
RELAXATION
STABILITY
STABILIZATION
TRAVELLING WAVES