V.E. Zuev Institute of Atmospheric Optics

About: V.E. Zuev Institute of Atmospheric Optics is a facility organization based out in . It is known for research contribution in the topics: Environmental science & Geology. The organization has 97 authors who have published 103 publications receiving 36 citations.

Atmospheric Research for Adaptive Optics

Abstract: Abstract Adaptive optics (AO) systems are an essential part of large astronomical telescopes and laser complexes operating through the atmosphere. Each AO system is individually designed; the requirements for the components and the performance of an AO system are determined by the intensity and distribution of turbulent fluctuations of the air refractive index over the radiation propagation path. In this work, we review the techniques and instruments for measuring and forecasting atmospheric conditions for AO, including devices and techniques developed at the Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences. The basic principles of atmospheric AO and the related atmospheric parameters are briefly described. Particular attention is paid to the parameter used for the estimation of capabilities of AO systems, i.e., the wind speed at a level of 200 hPa. The comparison with the data from foreign astronomical observatories is carried out. The necessity for atmospheric research for large Russian astronomical observatories is discussed.

Whispering-gallery modes promote enhanced optical backflow in a perforated dielectric microsphere

Abstract: Optical energy flow inside a dielectric microsphere is usually codirected with the optical wavevector. At the same time, if the optical field in a microsphere is in resonance with one of the high-quality spatial eigenmodes (whispering-gallery modes - WGMs), a region of reverse energy flow emerges in the shadow hemisphere. This area is of considerable practical interest due to increased optical trapping potential. In this Letter, we consider a perforated microsphere with an air-filled single pinhole fabricated along the particle diameter and numerically analyze the peculiarities of WGM excitation in a nanostructured microsphere. A pinhole isolates the energy backflow region of a resonant mode and changes a perforated microsphere into an efficient optical tweezer. For the first time to our knowledge, we reveal the multiple enhancement of backflow intensity in the pinhole at a WGM resonance and discuss the way for its manipulation.

Estimation of optimal wavelengths for atmospheric non-line-of-sight optical communication in the UV range of the spectrum in daytime and at night for baseline distances from 50 m to 50 km

Abstract: For implementation of non-line-of-sight optical communication, the wavelength from the range 200-400 nm at which the signal-to-noise ratio reaches a maximum depending on the baseline distance is estimated. The estimates are performed in the daytime, at moonlit night, and without background radiation. The results obtained allow us to recommend λ=290nm for the implementation of the long-range communication in the daytime and λ=350nm at night. For impulse response that provides the basis for estimating the communication channel quality, four algorithms of the Monte Carlo method are considered. The algorithm with modified double local estimate provides the least error for the same number of photon trajectories. UV radiation is potentially dangerous to humans, and therefore, the illuminance of the Earth's surface is estimated under the optical axis of the source for baseline distances of 2, 10, and 100 m together with the time period of a continuous communication session safe for operators.