Design of one-dimensional Lambertian diffusers of light

We describe a method for designing a one-dimensional random surface that acts as a Lambertian diffuser. The method is tested by means of rigorous computer simulations and is shown to yield the desired scattering pattern.Comment: 6 pages, 2 figure

Влияние физических, химических и биологических манипуляций на поверхностный потенциал кальций-фосфатных покрытий на металлических подложках

The electret voltage indices of artificial surfaces are dependent on coatings formation technology and may be regulated by means of change in their physical-chemical parameters. Chemical modification of radio frequency magnetron calcium phosphate coatings (RFMCPC) by means of silicious incorporation led to an augmentation of pieces’ electrostatic potential. A complication of RFMCPC relief that was fixed by roughness index Ra is accompanied by increase in electret voltage index of artificial surface and its statistical deviation. Bone marrow cells suspension in model biological electrolyte populated RFMCPC dimples. In this manner it modulated the amplitude and leveled out the differences of surface electrostatic potential.Показатели потенциала электростатического поля искусственных поверхностей зависят от технологии нанесения покрытий и могут регулироваться через изменение их физико-химических параметров. Химическая модификация высокочастотных (ВЧ) магнетронных кальций-фосфатных (КФ) покрытий посредством введения силикат-иона приводила к возрастанию электростатического потенциала изделий. Усложнение рельефа ВЧ-магнетронных КФ покрытий, зафиксированное по росту индекса шероховатости Ra, сопровождалось увеличением электретного потенциала поверхности и его статистической девиации. Взвесь клеток костного мозга в модельном биологическом электролите заполняла углубления КФ покрытий и, таким образом, модулировала амплитуду и выравнивала различия их поверхностного электростатического потенциала

Single-mode Er-doped fiber random laser with distributed Bragg grating feedback

We report the implementation of a one-dimensional random laser based on an Er/Ge co-doped single-mode fiber with randomly spaced Bragg gratings. The random grating array forms a complex cavity with high quality factor resonances in the range of gain wavelengths centered around 1535.5 nm. The reflection spectra of the grating array and the emission spectra of the laser are investigated for different numbers of gratings. The experimental results are compared qualitatively with numerical simulations of the light propagation in one-dimensional Bragg grating arrays based on a transfer matrix method. The system is pumped at 980 nm and the experimentally observed output radiation presents a typical laser threshold behavior as a function of the pump power. We find that the laser output contains several competing spectral modes. (C) 2009 Optical Society of Americ

The influence of physical, chemical and biological manipulations on surface potential of calcium phosphate coatings on metal substrates

The electret voltage indices of artificial surfaces are dependent on coatings formation technology and may be regulated by means of change in their physical-chemical parameters. Chemical modification of radio frequency magnetron calcium phosphate coatings (RFMCPC) by means of silicious incorporation led to an augmentation of pieces’ electrostatic potential. A complication of RFMCPC relief that was fixed by roughness index Ra is accompanied by increase in electret voltage index of artificial surface and its statistical deviation. Bone marrow cells suspension in model biological electrolyte populated RFMCPC dimples. In this manner it modulated the amplitude and leveled out the differences of surface electrostatic potential