Vol 17, No 1 (2023)

The most important optical element of the photodetector (PD) is the aperture “cold” diaphragm that protects the photodetector module against leakage radiation and flares. The article proposes a method to obtain and generate a coating on the aperture “cold” diaphragm surface being a PD component in the medium-wave and long-wave infrared band.

This article presents the research results on the control of the mechanical and functional titanium parameters by an additive surface laser micro-treatment with an additional graphite layer under the influence of near-IR laser radiation. The results of experimental studies on selection of the optimal laser radiation parameters for increasing the hardness and wear resistance of a model titanium sample are provided. The results demonstrate significantly increased hardness of the treated area (up to 9.3 times) and a decreased abrasive wear resistance rate by about 2 times compared to the original sample.

The influence of deviation of the beam splitter parameters on the operation of a quantum photon gate in an integrated optical version is considered. It is shown that the required accuracy is quite achievable for electro-optical control in the X-splitter geometry. The estimated length of the device demonstrates its possible implementation even on the substrates with a length of 3 inches.

The weak lines of CaII at 393 and 397 nm were observed upon 20 kHz insonification of 2M CaCl₂ aqueous solution in the multibubble sonoluminescence spectrum. The rough estimation of Ca ionization degree having made by comparison with the solar spectrum that indicates the significant thermodynamic nonequilibrium of processes in a cavitation bubble.

Optical gyros, such as ring laser gyros and fiber optical gyros, have become a basis for strapdown inertial navigation systems due to a number of advantages (larger dynamic range of the measured velocities; high stability of scale factor, insensitivity to linear acceleration and G-stress; smaller readiness time, etc.). Despite success in its development, ring laser and fiber optic gyros are unsuitable for using in control systems of small portable devices because of its large size and weight. Now the actual task is miniaturization of optical gyros, or development and research of microoptical gyros.

A model of the atmospheric optical communication channel based on scattered radiation in the UV wavelength range is considered. The model is based on the Monte Carlo method algorithms for the local and modified double local estimate to calculate the impulse response of the optical communication channel. The bit error rate in the day and at night is estimated for the wavelength range from 200 to 400 nm and information coding using the digital pulse interval modulation (DPIM). The results demonstrate that the wavelength λ = 295 nm is better to arrange a long-range communication using the receiving system under study in the daytime, whereas the wavelength λ = 395 nm is better at night.