Method of obtaining polarization converter

FIELD: physics.

SUBSTANCE: oxide glass is treated with a focused laser beam. The glass melting is performed at temperatures from 1650 to 1700°C. The composition of the glass is as follows, in mol. %: MgO 5-10, CaO 5-10, B2O3 5-10, Al2O3 15-20, SiO2 55-65.

EFFECT: simplification of the technology, reduction of the standard deviation of the value of the phase shift of the nanogrid.

2 ex, 1 dwg



Same patents:

FIELD: physics, optics.

SUBSTANCE: invention relates to an optical device for generating and viewing dynamic and static three-dimensional holographic images, comprising at least one laser radiation source, at least one light guide and holographic optical elements arranged on the surface of the light guide. The device further includes a spatial light modulator configured to generate a digital hologram and one holographic optical element for outputting radiation from the light guide. Said element is configured to compensate for eye defects by compensating for the shape of the wave front passing through said holographic optical element.

EFFECT: reconstruction of the three-dimensional image of an object which is synthesized using software and hardware, observation with an ametropic eye of which can be identical to observation of real three-dimensional objects with an emmetropic eye.

18 cl, 12 dwg

FIELD: physics.

SUBSTANCE: this limiter comprises translucent insulating substrate with semiconductor film on its surface to increase electric conductivity at heating by passing radiation and to be placed in the lens focal area. Said film is structured as a grid or mosaic of spots with mean periodicity of the structure smaller than radiation wavelength.

EFFECT: higher performance, lower threshold of operation.

4 cl, 3 dwg

FIELD: agriculture.

SUBSTANCE: group of inventions relates to the field of agriculture, namely the methods of electromagnetic effect on plants with visible wavelength range and the devices implementing these methods. The method comprises supplying the light flux from the emitter. And the light flux is passed through the polariser, polarised completely or partially, mixed, for example with non-polarised flow, if any, and is directed towards the plants. The density or the type or the density and the type of polarisation are adjusted, for example, by electric or magnetic field, or electric and magnetic fields. The device comprises an emitter with a reflector and is provided with the polariser located on the path of the light flux. And the polariser has a dielectric polarising medium, or the polarising medium sensitive to the electric or magnetic field, or to electric and magnetic fields. And the optical axes of polarising particles are located at an angle or angles to the optical axis of the emitter and form a monolayer or multilayer polarising medium. The device comprises the transparent electrodes, between which a polariser with electrically sensitive polarising medium is placed, and the outlets of the transparent electrodes are galvanically connected to the outlet of the control unit and overlaps the working surface of the polariser. The control winding is located in the plane of the polariser with magnetically sensitive medium and is connected to the current output of the control unit.

EFFECT: inventions provide improved plant vegetation and increase in the efficiency of the photosynthetic active radiation.

2 cl, 4 dwg

FIELD: physics.

SUBSTANCE: proposed shutter comprises locally smelting or evaporating mirror metal film located in focal area of the lens and secured by translucent substrate. On radiation side said substrate includes also the ply of translucent liquid of solid sol with nanoparticles in size smaller than radiation wavelength. Mirror film is arranged on said substrate on radiation side or opposite side.

EFFECT: lower threshold of shutter operation.

4 dwg

FIELD: physics, optics.

SUBSTANCE: invention relates to controlling intensity, colour, phase, polarisation or direction of light. In the method, the angular spectrum of the generated optical two-photon radiation is varied according to the spatial profile of variation of intensity of laser pumping. The key feature of the method is the use of laser pumping in high spatial modes in rigid focusing mode. The method is based on adaptive adjustment of the phase front of laser pumping using an active spatial light phase modulator. This adjusted front, owing to phase synchronism conditions in the nonlinear crystal, generates a biphoton amplitude shape corresponding to a spatial Bell state.

EFFECT: present method enables to generate maximally entangled Bell states of photon pairs in two-dimensional subspace of paraxial modes with single parity.

2 dwg

FIELD: physics.

SUBSTANCE: proposed method comprises application of an integer number of pairs consisting of zero and first tunnel-coupled nonlinear-optical waveguides (TCNOW). Length of every TCNOW includes even or odd number of radiation power pumping at low input intensity when optical nonlinearity influence on power pumping may be neglected. Note here that low and high intensity signals affecting the pumping owing to nonlinearity is fed to zero TCNOW waveguide. Radiation from output of zero or first TCNOW waveguide is fed to zero waveguide of the next TCNOW pair. Parameters of all TCNOW and intensity range of input signal intensity at zero waveguide of every TCNOW are selected so that high intensity signal exits from zero waveguide at odd number of pumping for low input intensities in TCNOW wavelengths, or from first waveguide at even number of pumping for low intensities in wavelengths of these TCNOW.

EFFECT: isolation of signal portion with maximum intensity.

12 cl, 6 dwg

FIELD: physics.

SUBSTANCE: laser radiation with nanosecond duration is transmitted through a plasma waveguide at an angle to the optical axis of the waveguide, optical refraction index distribution with a cylindrical profile with the maximum refraction index along the boundary and the minimum along the centre of the pipe is formed in the narrow spectral region of anomalous dispersion near the fixed spectral absorption line of the plasma.

EFFECT: obtaining, within a plasma waveguide, a regular spatial structure of the optical refraction index in the spectral region of anomalous dispersion near the wavelength which corresponds to the narrow spectral absorption line in high-speed ionisation wave plasma.

6 dwg

FIELD: physics.

SUBSTANCE: device comprises laser radiation source, polariser, spinning optical element and feedback circuit. The latter consists of light splitting plate, extra polariser, photo detector, amplifier, optical element and rotary unit spinning rpm control unit with polarisation plane turn transducer arranged thereat.

EFFECT: control over polarisation turn angle.

2 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to dimming thermochromic device, which includes at least two light-transmitting substrates and at least one thermochromic layer, reversibly changing transmission of light and heat flows with change of its temperature in visible and/or nearest IR parts of spectrum. Thermochromic layer is made from thermochromic material, representing photocurable composition based on mixture of monomers and oligomers of derivatives of unsaturated acids, which contains complexes of transition metals, halogenides of alkali and/or alkali earth metals. Application of claimed invention makes it possible to simplify technology of production, reduce energy and labour consumption of the process of thermochromic triplex manufacturing, and reduce its cost.

EFFECT: device manufacturing is characterised by low production toxicity, availability and cheapness of raw materials.

12 cl, 3 tbl, 4 ex, 122 dwg

FIELD: physics, optics.

SUBSTANCE: invention relates to the source of pulsed laser radiation, which includes optically series-connected to each other laser with continuous radiation, optical switch, synchronizer unit, optical delay device, optical radiation summation device, focusing system. An optical key, controllable master pulse oscillator and pulse counting device with the configurable scaling ratio are added, and the information input of an optical key is connected to the output of the continuous radiation laser, and the output is connected to the information input of the optical switch, the first output of the controllable master pulse oscillator is electrically connected to the control input of the optical key, the second output is electrically connected to the first control input of the optical switch and, besides, the second output of the controllable master pulse oscillator through the pulse counting device with the configurable scaling ratio is connected to the second control input of the optical switch.

EFFECT: increase of output intensity of optical laser radiation at the expense of impulse interference.

3 dwg

FIELD: physics.

SUBSTANCE: method of modulating light includes forming a magnetoplasmon crystal based on a periodically nanostructured dielectric array with a spatial period d, sputtering thereon layers of ferromagnetic and noble metals, as well as dielectrics, illuminating the magnetoplasmon crystal with light and applying a magnetic field. Modulation of the intensity of TM polarised reflected light is carried out using a periodically nanostructured film of ferromagnetic metal with thickness h=50-200 nm. The light source used is TM polarised electromagnetic radiation which falls on the surface of the magnetoplasmon crystal at an angle which corresponds to excitation of surface plasmon polaritons. An alternating magnetic field is applied in the form of equatorial Kerr effect.

EFFECT: reduced thickness of the magnetooptical modulator.

4 dwg

FIELD: physics, optics.

SUBSTANCE: invention relates to optoelectronics. The method of generating electromagnetic radiation in the terahertz range comprises interaction of directed exciting radiation with the active medium of a sample and obtaining secondary electromagnetic radiation. The active medium of the sample used is material with topological insulator properties, wherein excitation is carried out with pulsed radiation with exciting pulse duration τ=10-12-10-14 s, pulse energy Epul=10-5-10-2 J and wavelength λexc=350-5000 nm, wherein the exciting radiation is directed on the plane of the sample with active medium at an angle α≠90°. The active medium used can be a thin film or crystal of bismuth selenide (Bi2Se3) or bismuth telluride (Bi2Te3). The detecting element used can be zinc telluride (ZnTe).

EFFECT: enabling monitoring and control of generation parameters when exciting materials with topological insulator properties.

5 cl, 2 dwg

FIELD: physics.

SUBSTANCE: method of making a tinted article, having a tinting film, includes joining polymer sheets. The polymer sheets used are two sheets of a transparent material, one of which is coated with an elastic polymer in the form of points with size of less than 30 mcm, followed by polymerisation thereof, joining with another sheet by stacking, followed by sealing the periphery and feeding into the space between the films through a valve a coloured optically transparent working fluid for controlling the degree of light transmission through inlet and outlet thereof. During inlet of the working fluid, light transmission decreases and during outlet of the working fluid, light transmission increases.

EFFECT: controlling the degree of light transmission, which means improving optical characteristics of surfaces depending on operating conditions.

2 cl, 2 ex

FIELD: electricity.

SUBSTANCE: generator of subteraherz and teraherz emission includes a laser emission source, an electrical circuit with voltage sources and an impedance load, and an optically active element. The latter is provided with an additional field transistor provided in a gate area with a semiconductor layer with a short life time of photoexcited charge carriers, a gate of transparent or semi-transparent material; electric displacement is supplied to a sink and to a source of a conductive channel of the field transistor.

EFFECT: increasing output power.

2 dwg

FIELD: electricity.

SUBSTANCE: invention is related to edge-lit systems. The edge-lit system comprises an emission source in the forms of at least one light-emitting diode; the lower mirror with reflective coating; the upper reflective and diffusion film placed above the lower mirror and edge mirrors at four sides thus forming an air-filled waveguide together with the lower mirror and the upper reflective and diffusion film. The upper reflective diffusion plate is made of material with volume-diffuse scattering and reflective coating applied to its lower side; it has a number of transparent or partially transparent areas.

EFFECT: improving brightness and uniformity of lighting.

4 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: integrated vision and display system contains a layer generating display image; image detector is designed for visualisation of infrared radiation in the narrow range of angles in regard to display surface normal and it includes reflection of one or more objects at the display surface or close to it; radiator of the vision system is designed to radiate infrared radiation for the purpose of objects lighting; light waveguide passes visible and infrared radiation and has the opposite upper and/or lower surfaces designed to receive infrared radiation from the vision system radiator, to guide infrared radiation by TIR from the upper and lower surfaces and projection of infrared radiation to an object outside limits of the narrow range of angles in regard to display surface normal.

EFFECT: improving functionality and small size of the device.

14 cl, 14 dwg

FIELD: physics, optics.

SUBSTANCE: system for scanning collimated light comprises an optical waveguide, a system for inputting light into the first end of the optical waveguide and a controller for controlling position along the first end of the optical waveguide. The optical waveguide comprises a first end, a second end opposite the first end, a viewing surface which continues at least part between the first end and the second end, a back surface opposite the viewing surface, and an end reflector located at the second end of the optical waveguide. The end reflector comprises one or more polyhedral lens structures and a diffraction grating.

EFFECT: high efficiency of scanning collimated light.

13 cl, 16 dwg

FIELD: electricity.

SUBSTANCE: to obtain infrared radiation an electrical signal is sent to the input of the preemphases unit. The preemphases unit changes the signal form by taking the 8-th root of it. The changed signal is then sent to the input of the infrared radiation source.

EFFECT: simplification and acceleration of signal processing.

3 dwg

FIELD: electricity.

SUBSTANCE: group of inventions relates to lighting engineering. Backlight lighting device (24) is equipped with backlight base (22) with mounted LED unit (32) and a light-conducting plate (20), which lateral surfaces are light-receiving surfaces (20a). The LED unit (32) is faced to light-receiving surfaces (20a) of the light-conducting plate (20). The backlight base (22) has guide pins (40) protruding from the base plate surface (22a), at that the light-conducting plate (20) has concave connecting sections (38) at positions faced to the guide pins (40), while the guide pins (40) are coupled to the connecting sections (38). Lateral surface of each guide pin (40) is equipped with a through hole (40a), which passes through the above lateral surface.

EFFECT: prevention or exclusion of uneven brightness of the light emitted through the light-conducting plate.

9 cl, 12 dwg

FIELD: electricity.

SUBSTANCE: multielement terahertz radiation generator includes test sample, femtosecond laser, multielement emitter where element emitter is made in the form of crystal semiconductor with sputtered metal mask forming sharp laser illumination gradient for crystal semiconductor layer. On the boundary of illuminated and shaded parts of semiconductor layer, a sharp gradient of photoexcited charge carrier concentration is formed parallel to the semiconductor surface. In addition the device includes elliptical mirror forming a focused terahertz radiation beam, while multielement emitter includes a raster of cylindrical microlenses distributing laser radiation between element emitters and illuminating only those semiconductor layer areas involved in terahertz radiation generation. The metal mask is made in the form of flat metal stripes.

EFFECT: increased power of terahertz radiation, possible application of small test samples.

3 cl, 2 dwg

FIELD: physics.

SUBSTANCE: method includes heat treatment and formation of regions with modified optical properties. Heat treatment is carried out before the step of forming microoptical raster and includes forming heat-sealed layers on two opposite surfaces of a plate. The heat-sealed layers are formed by irradiating a plate made of porous optical material with laser radiation, the surface of the plate being in contact with a laser radiation-absorbing plate. After forming a heat-sealed layer on the second surface of the plate, microoptical raster is formed in the same layer. The raster is formed by irradiating the plane of forming regions, which is superimposed with the laser beam focusing plane, with laser radiation.

EFFECT: producing microoptical raster from positive microoptical elements on porous glass plates and higher optical power of microoptical elements in the raster.

31 dwg, 1 tbl