Optical Properties of Light-Scattering Standards for CCD Photometry.

This paper analyzes the light-scattering standards currently used for calibration (verification) and systematic research in photo and spectrophotometry tools. The application specificities in studying the diffuse reflected and transmitted light during biomedical CCD photometry are considered. The advantages of a new class of photometers with non-spherical reflectors as ellipsoids of revolution truncated along the focal planes with the internal mirror surface are presented.

[An influence of the modified therapy on the course of epilepsy in patients with the low cerebral spinal fluid-cranial index].

Aim: To evaluate the effect of modified therapy on the course of epilepsy in patients with the low cerebral-spinal-fluid-cranial (CSF-cranial) index.

Material And Methods: One hundred and twenty-four patients with cryptogenic epilepsy were prospectively analyzed. Group I consisted of 36 patients with a normal volume of reserve cerebrospinal fluid and a level of the CSF-cranial index within the physiological norm (from 1.

Spatially-resolved self-heterodyne spectroscopy of lateral modes of broad-area laser diodes.

We investigate the fine structure of the optical spectrum of a broad-area laser diode with approximately 30-MHz resolution using spatially-resolved self-heterodyning technique. We show that this method is capable of measuring the relative powers and spacings of the individual lateral modes.

Compact representation of the spatial modes of a phase-sensitive image amplifier.

We compute the eigenmodes of a spatially-broadband optical parametric amplifier with elliptical Gaussian pump and show that the well-amplified eigenmodes can be compactly represented by a low-dimensional subspace of the first few Laguerre- or Hermite-Gaussian (LG or HG, respectively) modes of an appropriate waist size. We also show that the first few eigenmodes are well matched to single LG or HG modes. For sufficiently large pump waists, the optimum waist size of the compact basis is in the vicinity of the geometric average of the pump waist size and the inverse spatial bandwidth of the nonlinear crystal in the parametric amplifier.

Spontaneous decay of CdSe/ZnS core-shell quantum dots at the air-dielectric interface.

We report measurements of the fluorescence decay times of CdSe/ZnS core-shell quantum dots at the air-dielectric interface for several dielectrics with different refractive indices. The results are in agreement with a simple theory that accounts for the impact of the refractive index on the density of states and magnitude of the vacuum field, as well as for the local-field correction inside the quantum dot. The results suggest that, by embedding the quantum dots into a high-index dielectric material, one can reduce the spontaneous decay time to sub-nanosecond scale while preserving high quantum efficiency.