Kerr effect in multilayer dielectric coatings.

We report the utilization of the optical Kerr effect in multilayer dielectric coatings, previously discussed only theoretically. We present the design and realization of multilayer dielectric optical structures with layer-specific Kerr nonlinearities, which permit tailoring of the intensity-dependent effects. The modulation depth in reflectance reaches up to 6% for the demonstrated examples of dielectric nonlinear multilayer coatings.

PROGNOSTIC CRITERIA OF VARIOUS CURRENTS OF CROHN'S DISEASE IN CHILDREN.

Objective: To identify clinical, laboratory and morphological prognostic criteria at different during Crohn's disease in children.

Materials And Methods: in 48 patients with primary BC in age from 1 year to 18 years retrospectively evaluated the clinical and medical history, laboratory parameters, used complex morphological study of the intestinal mucosa.

Results: prediction of complicated Crohns diseaseis important to the high humoral activity, small bowel localization process with the identifcation of ulcers, fractures, the presence of such cell populations in the mucosa of the colon as inactive macrophages and young tbroblasts, muscle infrtration of neutrophilic granulocytes plate.

Highly-dispersive mirrors reach new levels of dispersion.

A highly-dispersive mirror with the unprecedented group delay dispersion of -10000 fs in the wavelength range of 1025-1035 nm is reported. Reproducible production of a coating with such a high dispersion was possible due to the recently developed robust synthesis technique. Successful employment of the new highly-dispersive mirror in an oscillator is demonstrated.

High-power multi-megahertz source of waveform-stabilized few-cycle light.

Waveform-stabilized laser pulses have revolutionized the exploration of the electronic structure and dynamics of matter by serving as the technological basis for frequency-comb and attosecond spectroscopy. Their primary sources, mode-locked titanium-doped sapphire lasers and erbium/ytterbium-doped fibre lasers, deliver pulses with several nanojoules energy, which is insufficient for many important applications. Here we present the waveform-stabilized light source that is scalable to microjoule energy levels at the full (megahertz) repetition rate of the laser oscillator.

260-megahertz, megawatt-level thin-disk oscillator.

A Kerr-lens mode-locked (KLM) Yb:YAG thin-disk oscillator delivering 215-fs pulses with 75-W average power and 1.4-MW peak power at a repetition rate of 260 MHz is presented. Self-starting KLM is demonstrated at an output power of 68 W.