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SUMMARY:Modulated Waves in Electrodynamics and Optics. Historical Perspect
 ive - Lev Ostrovsky (University of Colorado Boulder)
DTSTART:20220711T153000Z
DTEND:20220711T160000Z
UID:TALK175841@talks.cam.ac.uk
DESCRIPTION:The 1960s-70s witnessed a fast development of the science of n
 onlinear waves. In particular\, it refers to modulated waves in which the 
 parameters of oscillations such as amplitude\, frequency\, and wavenumber\
 , are slowly varying\, and these variations can themselves propagate as no
 nlinear waves that can (albeit loosely) be called &ldquo\;waves of envelop
 es&rdquo\; or &ldquo\;waves of modulation.&rdquo\; The applications were m
 ostly related to two areas: the surface water waves\, and nonlinear electr
 omagnetic waves in transmission (delay) lines\, and\, of course\, in optic
 al systems under the action of lasers. The works in the first area began i
 n UK and USA\, and they are well known to this audience. Here we will conc
 entrate on the theory of modulated electromagnetic waves\, which began to 
 be developed in the former Soviet Union\, parallel to the Western works on
  water waves. This presentation outlines some aspects of these studies\, i
 ncluding such effects as self-phase modulation\, self-steepening of an env
 elope\, modulation instability\, and envelope solitons\, bright and dark. 
 Whenever possible\, the corresponding experimental results are shown.
LOCATION:Seminar Room 1\, Newton Institute
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