منابع مشابه
Spatial phase dislocations in femtosecond laser pulses
We show that spatial phase dislocations can be generated in femtosecond laser beams by computergenerated holograms provided they are build in a setup compensating for the introduced spatial dispersion of the broad spectrum. We present analytical results describing two possible arrangements dispersionless 4f -setup and double-pass grating compressor. Experimental results on the generation of opt...
متن کاملNonlinear optical beams carrying phase dislocations
We describe different types of self-trapped optical beams carrying phase dislocations, including vortex solitons and ring-like soliton clusters. We demonstrate numerically how to create such nonlinear singular beams by the interaction of several fundamental optical solitons. Mutual trapping of several solitons can be regarded as a synthesis of ‘soliton molecules’, and it corresponds to a transf...
متن کاملDensity of turbulence-induced phase dislocations.
Under certain conditions, light-wave propagation through turbulent media causes a specific type of phase distortion: so-called phase dislocations. A salient feature of phase dislocations is an appearance of zones where the phase turns out to be a multivalued function of coordinates. The problem of turbulence-induced phase dislocations is considered. Both a theoretical treatment and simulations ...
متن کاملPhase-field approach to surface-induced phase transformations and dislocations
The Ginzburg-Landau theory for multivariant martensitic phase transformations is advanced in three directions: the potential is developed that introduces the surface tension at interfaces; a mixed term in gradient energy is introduced to control the martensite-martensite interface energy independent of that for austenite-martensite; and a noncontradictory expression for variable surface energy ...
متن کاملInfluence of mobile dislocations on phase separation in binary alloys
We introduce a continuum model to describe the phase separation of a binary alloy in the presence of mobile dislocations. The kinetics of the local composition and dislocation density are coupled through their elastic fields. We show both analytically and numerically that mobile dislocations modify the standard spinodal decomposition process, and lead to several regimes of growth. Depending on ...
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ژورنال
عنوان ژورنال: Intermetallics
سال: 2001
ISSN: 0966-9795
DOI: 10.1016/s0966-9795(01)00083-8