14 research outputs found
Stable one-dimensional periodic waves in Kerr-type saturable and quadratic nonlinear media
We review the latest progress and properties of the families of bright and
dark one-dimensional periodic waves propagating in saturable Kerr-type and
quadratic nonlinear media. We show how saturation of the nonlinear response
results in appearance of stability (instability) bands in focusing (defocusing)
medium, which is in sharp contrast with the properties of periodic waves in
Kerr media. One of the key results discovered is the stabilization of
multicolor periodic waves in quadratic media. In particular, dark-type waves
are shown to be metastable, while bright-type waves are completely stable in a
broad range of energy flows and material parameters. This yields the first
known example of completely stable periodic wave patterns propagating in
conservative uniform media supporting bright solitons. Such results open the
way to the experimental observation of the corresponding self-sustained
periodic wave patterns.Comment: 29 pages, 10 figure
Stable multicolor periodic-wave arrays
We study the existence and stability of cnoidal periodic wave arrays
propagating in uniform quadratic nonlinear media and discover that they become
completely stable above a threshold light intensity. To the best of our
knowledge, this is the first example in physics of completely stable periodic
wave patterns propagating in conservative uniform media supporting bright
solitons.Comment: 12 pages, 3 figure
Curso 1967-68. Concierto de violonchelo
Tres fotografÃas del concierto de violoncello interpretado por Martha Gerschefskl, acompañada al piano por Edward H. Mattos, en el Aula de Salinas del edificio antiguo de la Universidad de Salamanca, organizado por la Cátedra de música Francisco Salinas y la Asociación de Antiguos Alumnos y Amigos de la Universidad de Salamanca ASUS, el 20 de noviembre de 1967