Conditions for bistability and solitons stability are defined in semiconductor laser with active and passive layers of
quantum dots. It is demonstrated the way to design of base optical parameters which are critical for stability of spatial
solitons. The possibility of localized structures formation from coherent excitons in thin semiconductor film is analyzed.
We present results of direct computer simulations of formation of laser bullets--3D localized (soliton-like) structures of coherent radiation in media with saturable optical absorption and amplification and frequency dispersion. Stable stationary symmetric and pulsing asymmetric laser bullets are demonstrated. Superstability of these dissipative solitons and absence of drift of their main parameters give good reason to believe that these structures are promising for applications in the field of optical information processing.
It has been designed and applied the method of transfer matrix for layered structures with second order nonlinearity, as new technique to simulate spectral characteristics of semiconductor microcavities. The nonlinearity of single layer is simulated by transfer matrix with 4 X 4 dimensions. Light intensity distributions and spectral dependencies for generator of second harmonic have been calculated. It has been shown that the most effective direction of second harmonic wave is not coincide with direction of incident wave. It is demonstrated the university of suggested algorithm and capability to extend it for other types of cavities and nonlinearities.
THe paper considers the possibility of application of doped chiral systems with properties of dynamic optical hysteresis as optical limiters. The theoretical analysis of interaction of transmitted radiation with a resonant absorbing chiral system is performed using both two-level and multi-level models of the absorbing center. Experimental values of nonlinearity threshold obtained for the system of ketocyanine - nematochiral liquid crystal were approximately 250 (mu) J/cm2 at the wavelength of 530 nm.
Transversely 2D laser autosolitons--localized structures of light in wide-aperture lasers with saturable absorption--with different topological indices and rotating axially non-symmetrical intensity distribution are analyzed by means of computer simulations. Four different types of collisions of laser autosolitons are presented.
We present the results of computer simulations of laser diffractive autosolitons--particle-like field structures in the wide-aperture lasers with saturable absorber. Existence of transversely motionless and moving patterns in one- and two-dimensional laser schemes is demonstrated.
We present the results of theoretical investigations and computer simulations of switching waves and diffractive autosolitons in wide-aperture lasers with additional nonlinear elements, nonlinear interferometers, and arrays of optically coupled passive nonlinear cavities excited by laser radiation.
The stimulated Brillouin scattering (SBS) excitation and hypersound generation experiments in collagen structures are described. Peculiar features of such structures explaining energy characteristics of SBS are considered. Potential biology and medicine applications of hypersound generated by SBS are discussed.
The fine-scale thermal self-action of the laser radiation in pulsed excimer lasers is shown. The increments of the convective instability are obtained. The range of transverse modulation periods is defined, for which the instability exhibits significant temporal growth. It is shown that this effect can increase the laser divergence.
Hard excitation of particle-like field structures in passive nonlinear interferometers (diffractive autosolitons) under conditions of transverse structure instability and in the case of unstable resonator are investigated. The existence of positive and negative diffractive autosolitons in a wide-aperture laser with saturable absorber is shown.
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