Development of spatial turbulence from boundary-controlled patterns in class-B lasers

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Eduardo Cabrera, Oscar G. Calderón, Sonia Melle, and J. M. Guerra
Departamento de Optica, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain

Received 1 February 2006; published 23 May 2006

Wereport time-resolved measurements of transverse dynamics in a pulsed custom-madeNd:YAG (yttrium aluminum garnet) broad-area laser, where a dynamic transitionfrom order to turbulentlike patterns appears, without the modification ofthe Fresnel number. To our knowledge, it is the firsttime this dynamical transition is observed in a class-B laser.Higher values of the pumping and a higher ratio betweenthe electric field and the inversion population decay rates diminishthe time at which the transition takes place. A theoreticalmodel based on the adiabatic approximation allows us to explainthe main features of the observed dynamics and to comparethe results with those previously seen, especially in broad-area CO₂lasers.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.053820
DOI:	10.1103/PhysRevA.73.053820
PACS:	42.65.Sf; 42.60.Jf; 42.60.Mi 42.65.Sf Dynamics of nonlinear optical systems including optical instabilities, optical chaos and complexity, and optical spatio–temporal dynamics 42.60.Jf Laser beam characteristics including profile, intensity, and power; spatial pattern formation 42.60.Mi Dynamical laser instabilities; noisy laser behavior YEAR: 2006
KEYWORDS:	solid lasers, neodymium, laser beams, optical pumping, pattern formation, turbulence

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