Laser beam focusing device

FIELD: laser engineering; delivery of focused laser beam to using equipment.

SUBSTANCE: proposed device has optically coupled input and output axicones made in the form of coaxially disposed internal an peripheral conical reflecting surfaces. Internal conical reflecting surfaces of axicones are disposed on rod ends. Rod is coupled with peripheral conical reflecting surfaces of axicones through pylons. Device is provided with two flat reflecting members. Internal conical reflecting surfaces of axicones disposed on rod ends have axial cylindrical lobes whose diameters are comparable with that of focused laser beam focal spot and have opposing mirror bevels at ends optically coupled with focal spot of focused beam through flat reflecting members.

EFFECT: enhanced power density of focused beam.

2 cl, 2 dwg

 

The invention relates to the field of laser technology and can be used in the delivery of the focused laser beam on the object (for example, when creating a laser technological complexes).

The known device for focusing the laser radiation, is made on the basis of optically conjugate Aksyonov, see L.W.Casperson and M.S.Shekhani. Breakdown in a Radial-Mode Focusing Element. Appl. Opt., v.13, No. 1, 1974, p.104-108; and W.R.Edmonds. The Reflakxicon, a New Reflective Optical Element, and Some Applications. Appl. Opt, v.12, No. 8, 1973, p.1940-1945.

The closest technical solution (prototype) of the present invention is a device for focusing of a laser beam containing optically coupled input and output axicon made in the form of coaxially arranged inner and peripheral conical reflecting surfaces, with the inner conical reflecting surface Aksyonov are mounted on the ends of the rod associated with peripheral conical reflecting surfaces of Aksyonov through pylons, see EN 2240615 C1, publ. 20.11.2004, bull. No. 32.

The shortcoming of the above technical solutions is the low power density in the focused beam of laser radiation due to the lack of use of radiation energy Central area served (focused) beam of laser radiation.

The technical result from the sing the proposed technical solution is to increase the power density of the focused beam of laser radiation.

In accordance with the invention the above technical result is achieved in that the device for focusing the laser radiation, comprising optically coupled input and output axicon made in the form of coaxially arranged inner and peripheral conical reflecting surfaces, with the inner conical reflecting surface Aksyonov are mounted on the ends of the rod associated with peripheral conical reflecting surfaces of Aksyonov through the pylons with two flat reflecting elements, and the interior conical reflecting surface Aksyonov mounted on the ends of the rod, provided with axial cylindrical protrusions, and the diameters of the above-mentioned axial protrusions commensurate with the diameter of the focal spot of the focused laser beam and made with multi-directional mirror bevels on the ends optically coupled through a flat reflecting elements with focal spot of the focused radiation.

In addition, the base of the axial cylindrical protrusion of the inner conical reflective surface of the input axicon is made with a groove.

Figure 1 shows the proposed device for focusing the laser radiation; figure 2 - the same place I on figure 1 on an enlarged is asstube.

The device contains input axicon in the form of a coaxially arranged inner 1 and 2 peripheral conical reflecting surfaces and is placed coaxially with the input axicon output axicon internal 3 and 4 peripheral conical reflecting surfaces. Reflective surfaces 1 and 3 are mounted on the ends of the rod 5, which is connected with the reflecting surfaces 2 and 4 using pylons 6, for example, through the sleeve 7. The internal reflecting surface 1 and 3 Aksyonov provided with axial cylindrical protrusions 8 and 9 with an outer diameter commensurate with the diameter d of the focal spot of the focused laser radiation (f1+F0). At the ends of the protrusions 8 and 9 are made of versatile mirror bevels 10 and 11, opposite which has a flat mirror elements 12 and 13. To avoid scattering of the radiation in place of the pair of the protrusion 8 and the reflective surface 1 (due to the presence of the radius on the sharp edge of the cutting tool for machining the reflecting surfaces of the device) in the base of the protrusion 8 is provided with a groove 14 (see figure 2).

The operation of the device is as follows.

Parallel beam (f1+F0laser radiation supplied to the internal reflecting surface 1 input axicon. Part of the radiation (f0using perifer is inih reflecting surfaces 2 and 4 Aksyonov, getting on internal (focusing) surface 3 of the output of the axicon, concentrated in the focus F of the device with the diameter of the focal spot, is equal to d. Central region (f1) the focused radiation through the mirror bevel 10, the elements 12 and 13 and the mirror bevel 11 is also fed to the focus F, where it is summed with a focused region f0radiation, thereby creating an increased power density of the focused radiation.

From the above it follows that the proposed solution has the advantage compared with the known, namely due to the additional use of radiation energy of the Central region of the focused radiation increases the power density in the area of the focal spot of the device.

Therefore, an apparatus for focusing laser radiation when used gives a positive technical result - increases the power density of the focused radiation.

For application materials, the company currently fabricated prototype of the proposed device, which, when tests confirmed the achievement of the above-mentioned technical result.

1. A device for focusing of a laser beam containing optically coupled input and output axicon made in the form of coaxially arranged inner and the peripheral port of a conical reflecting surfaces, the interior conical reflecting surface Aksyonov are mounted on the ends of the rod associated with peripheral conical reflecting surfaces of Aksyonov through pylons, characterized in that it has two flat reflecting elements, and the interior conical reflecting surface Aksyonov mounted on the ends of the rod, provided with axial cylindrical protrusions, and the diameters of the above-mentioned axial protrusions commensurate with the diameter of the focal spot of the focused laser beam and is made with multidirectional mirror bevels on the ends optically coupled through a flat reflecting elements with focal spot of the focused radiation.

2. The device according to claim 1, characterized in that the base of the axial cylindrical protrusion of the inner conical reflective surface of the input axicon is made with a groove.



 

Same patents:

FIELD: medical engineering.

SUBSTANCE: method involves manufacturing lens from material capable of photopolymerization, forming one or several lenses with required focal distance by introducing required quantity of the lens material in liquid state into cylindrical holder which material possesses required wetting angle for given liquid. The holder is placed on centrifuge and rotated together with the lens material to achieve uniformity under preset rotation frequency condition. Then, when rotating, the lens material is transformed into solid state due to light source radiation flow being applied. Rotation is stopped and lens is assembled in the holder. Oligomer composition, capable of frontal free radical photopolymerization with monomer corresponding to it, and reaction photoinitiator, is taken as the lens material. Working temperature is to be not less than on 30-40°С higher than polymer glass-transition temperature during polymerization. The lens material transformation into solid state by applying rotation is carried out by means of frontal photopolymerization method with polymerization front moving along the lens axis from below upwards or along the lens radius.

EFFECT: enhanced effectiveness in producing x-ray lenses having paraboloid-of-revolution refraction structure and having aperture increased to several millimeters without microroughnesses available on the surface.

8 cl

FIELD: optics.

SUBSTANCE: in accordance to method, for manufacturing lens with required focal distance F, one or several lenses are made with focal distance, determined from formula , where N - number of lenses, and F0=Rc/2δ, where Rc - parabolic profile curvature radius, δ - decrement of refraction characteristic of lens material related to class of roentgen refracting materials, after that required amount of lens material is injected, where ρ - density of lens material, R - lens radius, in liquid state into cylindrically shaped carrier with same internal radius, material of which provides wetting angle to aforementioned liquid, determined by condition , carrier is moved to centrifuge, carrier with lens material are rotated until reach of homogeneity at angular rotation frequency , where η - viscosity of lens material in liquid state, Re - Reynolds number, then lens material is transferred to solid state during rotation, rotation is stopped and lens is assembled in holder.

EFFECT: production of lenses having aperture increased up to several millimeters, having perfect refracting profile in form of paraboloid of revolution with absent micro-irregularities (roughness) of surface.

11 cl

FIELD: engineering of devices for controlling flows of particles, possible use for flipping spin of polarized neutrons.

SUBSTANCE: device contains one coil, creating alternating magnetic field, perpendicular to flight of neutrons, second coil, creating constant magnetic field, strength of which changes linearly along working area, parallel to flight of neutrons, and made in form of solenoid. First coil is composed of two symmetrically positioned one-layer coils, each one of which is made in form of one-layer spiral, opposite segments of which are bent at direct angle to spiral plane, and coils are mounted so that these segments are facing each other. Each one-layer coil is placed inside hermetic container made of dielectric material and repeating the shape of coil. Containers have apertures and air ducts for communication with air environment. Neutron duct is moved into space formed by two one-layer coils. Construction of device makes it possible to exclude presence of constant magnetic field, direction of which is perpendicular to neutrons flight direction, and creates magnetic field parallel to magnetizing field of neutron duct, resulting in prevention of depolarization of flow of polarized neutrons (intensiveness of the flow of polarized neutrons does not decrease).

EFFECT: increased efficiency.

1 cl, 5 dwg

FIELD: engineering of devices for controlling flows of particles, possible use for flipping spin of polarized neutrons.

SUBSTANCE: device contains one coil, creating alternating magnetic field, perpendicular to flight of neutrons, second coil, creating constant magnetic field, strength of which changes linearly along working area, parallel to flight of neutrons, and made in form of solenoid. First coil is composed of two symmetrically positioned one-layer coils, each one of which is made in form of one-layer spiral, opposite segments of which are bent at direct angle to spiral plane, and coils are mounted so that these segments are facing each other. Each one-layer coil is placed inside hermetic container made of dielectric material and repeating the shape of coil. Containers have apertures and air ducts for communication with air environment. Neutron duct is moved into space formed by two one-layer coils. Construction of device makes it possible to exclude presence of constant magnetic field, direction of which is perpendicular to neutrons flight direction, and creates magnetic field parallel to magnetizing field of neutron duct, resulting in prevention of depolarization of flow of polarized neutrons (intensiveness of the flow of polarized neutrons does not decrease).

EFFECT: increased efficiency.

1 cl, 5 dwg

Radiation head // 2293387

FIELD: radiation engineering; devices for controlling particle flux or electromagnetic radiation using collimator for the purpose.

SUBSTANCE: proposed radiation head has radiation source holder installed in fixed housing made of absorbing material with biological-shield wicket gate joined with its cylindrical sliding surface and labyrinth collimating surface which form ball in closed position; wicket gate pivot is located in center of cylindrical surface of housing. In addition, set of filters separately mounted in stepped spline guides of housing is attached radially relative to common pivot, butt-ends of filters being congruent to housing collimating channel surface; holder is provided with blind pocket in butt-end opposite to source which has through slit to receive telescopic lock damper; the latter is mounted on rod whose spring-loaded flange is loosely mounted inside supporting grip; each filter is separately secured on double-arm positioning lever.

EFFECT: enlarged capabilities of dosing radiation power, enhanced radiation safety in head servicing and storage.

3 cl, 4 dwg

FIELD: optical trap matrix control and particle matrix formation.

SUBSTANCE: proposed method and device are implemented by laser and variable-time optical diffraction element enabling dynamic control of optical-trap matrices followed by controlling particle matrices and also using plurality of optical traps to provide for handling single objects.

EFFECT: improved method and system for producing plurality of optical traps.

30 cl, 10 dwg

FIELD: ultra-violet radiation.

SUBSTANCE: the mirror-monochromator has a multi-layer structure positioned on a supporting structure and including a periodic sequence of two separate layers (A,B) of various materials forming a layer-separator and a layer-absorber with a period having thickness d, Bragg reflection of the second or higher order is used. Mentioned thickness d has a deviation from the nominal value not exceeding 3%. The following relation is satisfied: (nAdA + nBdB)cos(Θ) = m λ/2, where dA and dB - the thicknesses of the respective layers; nA and nB - the actual parts of the complex indices of reflection of materials of layers A and B; m - the integral number equal to the order of Bragg reflection, which is higher than or equal to 2, λ - the wave-length of incident radiation and Θ - the angle of incidence of incident radiation. For relative layer thickness Г=dA/d relation Г<0.8/m is satisfied.

EFFECT: provided production of a multi-layer mirror, which in the range hard ultra-violet radiation has a small width of the reflection curve by the level of a half of the maximum at a high reflection factor in a wide range of the angles of incidence.

6 cl, 1 dwg

FIELD: medical eqipment.

SUBSTANCE: device can be used for rigging digital X-ray diagnostic apparata. Device has for diaphragming working bunch of medical X-ray diagnostic apparatus has depth diaphragm provided with top and lower group of shutters made of material withhigh atomic number, for example, of plumbum. Shutters are made for movement by mechanism connected with electric engine and disposed between entrance and exit holes of depth diaphragm. Case of diaphragm is tightly connected with optical window of X-ray irradiator. Digital photocamera is fixed inside case of depth diaphragm. Photocamera is connected with computer equipped with display and with electric coordinatographic device connected woth electric engine. Digital photcamera is mounted for bringing phot image together with X-ray image. Camera is has two mirrord, one of which mirrors is disposed within area of direct X-ray from X-ray radiator. Shadow image of internal organs is brought into coincidence with image of skin cover of patient within area of rentgenography.

EFFECT: eased scheduling of surgical operation.

3 dwg

FIELD: roentgen optics; roentgen ray flux reflecting, focusing, and monochromatization.

SUBSTANCE: proposed method for controlling X-ray flux by means of controlled energy actions on control unit incorporating diffraction medium and substrate includes change of substrate and diffraction medium surface geometry and diffractive parameters of this medium by simultaneous action on control-unit substrate and on outer surface of control-unit diffraction medium with heterogeneous energy. X-ray flux control system has X-ray source and control unit incorporating diffraction medium and substrate; in addition, it is provided with diffraction beam angular shift corrector connected to recording chamber; control unit is provided with temperature controller and positioner; substrate has alternating members controlling its geometric parameters which are functionally coupled with physical parameters of members, their geometric parameters, and amount of energy acting upon them. Diffraction medium can be made in the form of crystalline or multilayer periodic structure covered with energy-absorbing coating.

EFFECT: enhanced efficiency of roentgen-ray flux control due to dynamic correction of focal spot shape and size.

3 cl, 1 dwg

FIELD: optical instrument engineering.

SUBSTANCE: before conversing parallel laser radiation beam of continuous cross-section to circular-section beam, the central round-shaped part is cut out of parallel laser radiation beam for subsequent delivery to specified circular-section beam convergence point. Device has entrance and exit axions that are optically conjugated. One reflecting conic surface of axion is mounted onto ends of hollow rod connected with other reflecting conic surface of axions through pylons. Cavity of rod is divided by partition provided with nozzles for supplying coolant into mentioned compartments. Reflecting surfaces of axions and partition of rod are made with through axial holes. Diameter of axial hole of reflecting conic surface of axions is commensurable with diameter of spot of focused laser radiation. Laser radiation beams can be focused with higher power of density.

EFFECT: increased power density.

4 cl, 1 dwg

FIELD: optics.

SUBSTANCE: proposed process includes layer-by-layer cross-linking of photopolymerizing molecules by means of focused optical radiation to produce spatially confined X-ray passages disposed within X-ray absorbing material. To this end X-ray absorbing material is added in advance to photopolymerized material, and collimator space, except for X-ray passages, is cross-linked using photochemical method.

EFFECT: enhanced spatial resolution and convergence of spatially confined X-ray passages into single point; reduced cost of process.

3 cl

FIELD: radiation shielding and masking systems, those producing illumination effects (advertisement, decorative lights), data display systems.

SUBSTANCE: proposed device that can be used for dissipating electromagnetic radiation, such as light, radio waves, X-rays, as well as for dissipating particle streams is, essentially, multilayer screen some of whose layers are deformable ones. Electric field is built up between two electricity conducting layers due to voltage applied to these layers. In the process conducting layers are split into segments and separate electrodes are brought to respective layers. Voltage applied to separate segments permanently varies with the result that electric field produced is nonuniform and deformable layers are embossed due to nonuniformity of attractive forces between electrodes, this embossed pattern permanently changing its configuration. Radiation (light of different ranges, radio and electromagnetic waves, particle streams) passed through screen or reflected therefrom dissipate due to optical nonuniformity. Kind of dissipation continuously varies due to changes in embossed pattern. Segments of conducting layers can be energized obeying different laws including pseudorandom one.

EFFECT: reduced specific surface power of incident radiation.

4 cl, 2 dwg

FIELD: nuclear physics.

SUBSTANCE: device realizes electric magnet for spectroscopy of decomposition of neutron, with current configuration, providing magnetic field of 1/R type, where R - radial distance from device axis. Magnet includes no iron and field is fully absent at distance of near 25 cm and more from its outer surface. Device has two hollow semi-cylinders which connect through Φ-like flanges. This capability is achieved due to use in construction of each semi-cylinder of two coaxial semi-pipes, supported by their edges by setting grooves of flanges, containing elements for pressurization and centering.

EFFECT: higher trustworthiness, higher reliability, higher durability, higher precision.

2 dwg

FIELD: X-ray diffraction and X-ray topography methods for studying the structure and quality control of materials during nondestructive testing.

SUBSTANCE: the invention is intended for X-ray beam shaping, in particular, the synchrotron radiation beam, by means of crystals-monochromators. The device for X-ray beam shaping has two crystals-monochromators in the dispersionless diffraction scheme. It is ensured by the possibility of displacement of one from crystals in the direction of the primary beam with crystal fixing in two discrete positions. Both crystals-monochromators have the possibility of rotation for realization of the successive Bragg diffraction. Device for crystal bending has displacement mechanism, two immovable and two movable cylindrical rods, between of which the end parts of a bent crystal are located. The axes of these parts are displaced one in respect to the other. The immovable rods are leaned against the upper surface of a flat parallel plate near its end faces. The L-shaped brackets are attached to the end faces of plate. The parallel surfaces of the brackets contact with immovable rods. The parallel surfaces of the end faces of the upper joints of L-shaped brackets contact with movable rods. The plate with L-shaped brackets is embraced with crooked shoulders of floating rocker with cylindrical pins, installed on the rocker ends. The pins are leaned against the surfaces of movable rods perpendicularly to them. The displacement mechanism is located between the lower surface of plate and middle point of the rocker.

EFFECT: increasing the energy range of X-ray beam when maintaining its spatial position; improving the uniformity of bending force distribution and homogeneity of crystal deformation.

2 cl, 2 dwg

FIELD: optical instrument engineering.

SUBSTANCE: before conversing parallel laser radiation beam of continuous cross-section to circular-section beam, the central round-shaped part is cut out of parallel laser radiation beam for subsequent delivery to specified circular-section beam convergence point. Device has entrance and exit axions that are optically conjugated. One reflecting conic surface of axion is mounted onto ends of hollow rod connected with other reflecting conic surface of axions through pylons. Cavity of rod is divided by partition provided with nozzles for supplying coolant into mentioned compartments. Reflecting surfaces of axions and partition of rod are made with through axial holes. Diameter of axial hole of reflecting conic surface of axions is commensurable with diameter of spot of focused laser radiation. Laser radiation beams can be focused with higher power of density.

EFFECT: increased power density.

4 cl, 1 dwg

FIELD: roentgen optics; roentgen ray flux reflecting, focusing, and monochromatization.

SUBSTANCE: proposed method for controlling X-ray flux by means of controlled energy actions on control unit incorporating diffraction medium and substrate includes change of substrate and diffraction medium surface geometry and diffractive parameters of this medium by simultaneous action on control-unit substrate and on outer surface of control-unit diffraction medium with heterogeneous energy. X-ray flux control system has X-ray source and control unit incorporating diffraction medium and substrate; in addition, it is provided with diffraction beam angular shift corrector connected to recording chamber; control unit is provided with temperature controller and positioner; substrate has alternating members controlling its geometric parameters which are functionally coupled with physical parameters of members, their geometric parameters, and amount of energy acting upon them. Diffraction medium can be made in the form of crystalline or multilayer periodic structure covered with energy-absorbing coating.

EFFECT: enhanced efficiency of roentgen-ray flux control due to dynamic correction of focal spot shape and size.

3 cl, 1 dwg

FIELD: medical eqipment.

SUBSTANCE: device can be used for rigging digital X-ray diagnostic apparata. Device has for diaphragming working bunch of medical X-ray diagnostic apparatus has depth diaphragm provided with top and lower group of shutters made of material withhigh atomic number, for example, of plumbum. Shutters are made for movement by mechanism connected with electric engine and disposed between entrance and exit holes of depth diaphragm. Case of diaphragm is tightly connected with optical window of X-ray irradiator. Digital photocamera is fixed inside case of depth diaphragm. Photocamera is connected with computer equipped with display and with electric coordinatographic device connected woth electric engine. Digital photcamera is mounted for bringing phot image together with X-ray image. Camera is has two mirrord, one of which mirrors is disposed within area of direct X-ray from X-ray radiator. Shadow image of internal organs is brought into coincidence with image of skin cover of patient within area of rentgenography.

EFFECT: eased scheduling of surgical operation.

3 dwg

FIELD: ultra-violet radiation.

SUBSTANCE: the mirror-monochromator has a multi-layer structure positioned on a supporting structure and including a periodic sequence of two separate layers (A,B) of various materials forming a layer-separator and a layer-absorber with a period having thickness d, Bragg reflection of the second or higher order is used. Mentioned thickness d has a deviation from the nominal value not exceeding 3%. The following relation is satisfied: (nAdA + nBdB)cos(Θ) = m λ/2, where dA and dB - the thicknesses of the respective layers; nA and nB - the actual parts of the complex indices of reflection of materials of layers A and B; m - the integral number equal to the order of Bragg reflection, which is higher than or equal to 2, λ - the wave-length of incident radiation and Θ - the angle of incidence of incident radiation. For relative layer thickness Г=dA/d relation Г<0.8/m is satisfied.

EFFECT: provided production of a multi-layer mirror, which in the range hard ultra-violet radiation has a small width of the reflection curve by the level of a half of the maximum at a high reflection factor in a wide range of the angles of incidence.

6 cl, 1 dwg

FIELD: optical trap matrix control and particle matrix formation.

SUBSTANCE: proposed method and device are implemented by laser and variable-time optical diffraction element enabling dynamic control of optical-trap matrices followed by controlling particle matrices and also using plurality of optical traps to provide for handling single objects.

EFFECT: improved method and system for producing plurality of optical traps.

30 cl, 10 dwg

Radiation head // 2293387

FIELD: radiation engineering; devices for controlling particle flux or electromagnetic radiation using collimator for the purpose.

SUBSTANCE: proposed radiation head has radiation source holder installed in fixed housing made of absorbing material with biological-shield wicket gate joined with its cylindrical sliding surface and labyrinth collimating surface which form ball in closed position; wicket gate pivot is located in center of cylindrical surface of housing. In addition, set of filters separately mounted in stepped spline guides of housing is attached radially relative to common pivot, butt-ends of filters being congruent to housing collimating channel surface; holder is provided with blind pocket in butt-end opposite to source which has through slit to receive telescopic lock damper; the latter is mounted on rod whose spring-loaded flange is loosely mounted inside supporting grip; each filter is separately secured on double-arm positioning lever.

EFFECT: enlarged capabilities of dosing radiation power, enhanced radiation safety in head servicing and storage.

3 cl, 4 dwg

Up!