Ultraviolet writing of channel waveguides in proton-exchanged LiNbO₃

We report on a direct ultraviolet (UV) writing method for the fabrication of channel waveguides at 1.55 µm in LiNbO3 through UV irradiation of surface and buried planar waveguides made by annealed proton exchange and reverse proton exchange. A systematic study of the guidance properties as a function of the UV writing conditions is presented

Correction of Y-Branches on Proton-exchanged Waveguides in Lithium Niobate By Femtosecond Writing Technology

Correction Y-branches power dividers of the multi-function integrated optics chips on proton-exchanged waveguides in lithium niobate by the technology of direct femtosecond laser writing were investigated. Optimal correction parameters and their influence on temperature stability of Y-splitter are determined. Keywords: lithium niobate, Y-splitters, proton exchange, femtosecond writing, refractive index, integrated optics

Direct laser writing of periodic structures in a Cu-doped near-surface layer on z-cut LiNbO3 crystals

This work is funded by Volkswagen Foundation/Trilateral Project “Investigation of the domain wall conductivity in uniaxial ferroelectrics"

Production Asymmetry Measurement of High Xt Hadrons in pp Collisions at 40 GeV

Single-spin asymmetries for hadrons have been measured in collisions of transversely-polarized 40 GeV/c proton beam with an unpolarized liquid hydrogen target. The asymmetries were measured for pi+-, K+-, protons and antiprotons, produced in the central region (0.02 < Xf < 0.10 and 0.7 < Pt < 3.4 GeV/c). Asymmetries for pi+-, K+- and antiprotons show within measurement errors the linear dependence on Xt and change a sign near 0.37. For protons negative asymmetry, independent of Xt has been found. The results are compared with those of other experiments and SU(6) model predictions.Comment: 25 pages (Latex), 12 Postscript figure

Комбинированное лечение метастазов почечно-клеточного рака в позвоночник

This study is a retrospective analysis of the combined treatment of patients with metastatic renal cell carcinoma who had undergone spinal surgery. Objective: to evaluate the effect of the type of surgery on the spine, as well as targeted therapy on outcomes, quality of life and long-term outcomes of patients with mRCC in the spine. According to our data the survival of patients treated with targeted therapy was significantly higher than in patients without it. The use of targeted therapy in conjunction with surgery and sometimes teletherapy (DLT), increases survival and improves quality of life of patients with mRCC in the spine. Данная работа представляет собой ретроспективный анализ результатов комбинированного лечения пациентов с метастазами почечно-клеточного рака, перенесших операции на позвоночнике. Цель исследования – оценка влияния вида оперативного вмешательства на позвоночнике, а также таргетной терапии на исходы, качество жизни и отдаленные результаты лечения пациентов с метастазами почечно-клеточного рака в позвоночник. По нашим данным, выживаемость больных, получавших таргетную терапию, достоверно выше, чем у пациентов без нее. Применение таргетной терапии совместно с хирургическим лечением, а иногда и дистанционной лучевой терапией увеличивает выживаемость, улучшает качество жизни пациентов с метастазами рака почки в позвоночник

Subsurface disorder and electro-optical properties of proton-exchanged LiNbO3 waveguides produced by different techniques

It has been established, that proton-exchanged LiNbO3 waveguides have a marked subsurface layer with structural disorder inducing degradation of electro-optical properties of these waveguides. At the same time, such a subsurface disorder is found to be less pronounced in soft proton-exchanged (SPE) waveguides in comparison with annealed proton-exchanged (APE) ones. The experimental samples of phase modulators fabricated by SPE technique exhibit a better electro-optical efficiency compared to the LiNbO3 modulators produced by the standard and improved APE techniques