Electron-beam-sustained gas laser with nonautonomous discharge and longitudinal configuration of pumping gas mixture
(57) Abstract:Usage: CO2lasers closed loop pumping of the working environment and the ionization of the gas electron beam intended for use in the Metalworking, mining and other industries. The inventive laser contains located in a discharge chamber of the cathode and anode electrodes, made in the form of gratings, in which the gas flow is directed in the direction of the electric field between the electrodes, the electron beam from the ionization device is directed opposite to the direction of the electric field and the optical axis of the resonator perpendicular to the gas flow and electric field in the space between the electrodes directly into the discharge zone, perpendicular to the planes of electrodes installed dielectric screens, made of porous ceramics, developed surface facing to the inner region of the discharge chamber. 2 Il. The invention relates to CO2lasers closed loop pumping of the working environment and the ionization of the gas electron beam, intended for use in the Metalworking, mining and other industries p is And 3702973, 01S3/00 issued 14.11.75 g] In the discharge region of the laser is set to the anode and cathode of a rectangular shape, between which the pumped gas mixture of N2-CO2-He. Perpendicular to the flow of gas in the interelectrode space from the cathode, with a net structure, a directed electron beam, and the optical axis of the resonator perpendicular to the electron beam and the gas flow.The design flaws electroionization lasers with transverse discharge are:
the presence of extended electrode layers overheated pornsleep mixture due to the pumping of the mixture along the anode and cathode electrodes;
the presence of peripheral areas of deposition along the gas flow, and the inlet and outlet of the discharge region due to scattering of ionizing electron beam on an output device of the electron source in Gaza;
increased turbulent pulsations in the gas density and refractive index due to required for this scheme discharge of high velocity gas;
bleed heat tube expanded gas along the flow due to turbulence, diffusion and heat conduction when operating in the pulse-periodic mode;
high power required for system nThe disadvantages of free longitudinal scheme of discharge. Known electron-beam-sustained laser [Joder M. J. et al, Theoretical and Experimental Performance of a High-Power-Sustained Electron Laser. Journal of Applied Physics, 1978, vol. 49, N 6] containing located in a discharge chamber of the cathode and anode electrodes, made in the form of lattices. The gas flow is directed into the interelectrode space on the anode side through the electrodes, i.e. in the direction of the electric field. In the opposite direction from the cathode in this space filed with the electron beam through the output device of the ionization source. The optical axis of the resonator in such a laser is directed perpendicular to the gas flow and electric field.The design does not provide sufficient uniformity of the gas flow, introduces restrictions on the strength of the electric field, and does not provide the necessary uniformity of the electric discharge directly into the discharge zone, due to the interelectrode distance of the walls of the discharge chamber.The invention is directed to solving the task of creating a industrial laser with longitudinal discharge circuit when forming a uniform velocity profile of the gas flow in the discharge zone and the spatial restriction of the gas ionization zone, i.e. on the creation of l is the call of the laser sustained discharge and longitudinal configuration of pumping gas mixture, containing located in a discharge chamber of the cathode and anode electrodes, made in the form of gratings, in which the gas flow is directed in the direction of the electric field between the electrodes, the electron beam is directed opposite to the direction of the electric field and the optical axis of the resonator perpendicular to the gas flow and the electric field, the above task is solved in that in the space between the electrodes directly into the discharge zone, perpendicular to the planes of electrodes installed dielectric screens, made of porous ceramics. The structure of this ceramic is formed from a thin wavy ceramic layers to form between the layers of mesh intervals with a developed surface. The screen is set so that the extended surface with mesh intervals were internal lateral wall of the discharge chamber.The technical result of the invention is to increase the laser power, reducing its angular divergence, which leads to the increase of the radiation intensity in the far zone. This is provided by the spatial limitation of the zone of deposition of the dielectric of the porous ceramics.The invention is in the n fragment of the block of porous ceramics, of which are recruited dielectric screens, limiting the area of deposition.In the case of the laser 1 in a discharge chamber (Fig.1) installed at a distance from each other of the cathode electrode 2 and anode electrode 3 having a rectangular shape and the lattice structure. The cathode electrode is grounded and the anode electrode 3 connected to the high voltage input 4, to which the summed voltage 15-40 kV (depending on the pressure of the working mixture), forming an electric field in the interelectrode space. The direction field shown by the arrow 5. Between the edges of the electrodes 2 and 3 with the dielectric screen 6 formed by blocks of porous ceramics, installed perpendicular to the planes of the electrodes. From the ionization source 7 (which can be used close-up electronic accelerator) in the discharge zone is directed to the electron beam 8. From block prokatnyh device 9 into the chamber through the anode electrode is directed gas stream 10 (gas mixture CO2-N2-He). In the case of laser 1 between the block prokatnyh device 9 and the walls of the enclosure are fitted with heat exchangers 11 and between the block prokatnyh device and the anode electrode installed dielectric wall 12. The optical axis 13 of the resonator, the mirrors of the resonator is above the plane of the drawing, and the second one under it.Side a (Fig.2) block of porous ceramics and opposite the side in contact with the electrode surfaces, and side forms the inner surface of the discharge chamber.The device operates as follows.The gas flow 10 is discharged by the unit prokatnyh device 9 into the discharge zone through the anode electrode 3. Simultaneously, the area of the discharge ionizes the outer electron beam 8 ionization source 7 and is pumped by energy of the electric field 5, is applied between the electrodes 3 and 2.Ceramic screens 6 contribute to the formation of a uniform velocity profile of gas, prevent the formation in the zone of scattered heterogeneous electron beam and developed fine structure of screens to achieve a high electric field intensity in the discharge, which in combination leads to increased homogeneity and stability of the discharge, to increase the power input, removable optical resonator 13 of the laser power and to reduce the angular divergence of the laser. Ceramics, which are made screens 6, provides a high radiation resistance screens and reliability of the laser. In addition e is the prevalence of gas-dynamic perturbations, i.e. improve optical uniformity of the active medium and reduce the angular divergence of the laser. From the zone of discharge of the gas mixture is carried through the cathode electrode 2, flowing outlet device ionization source 7 passes through the heat exchanger 11 and is fed to the input of block prokatnyh devices 9.The implementation of this technical solution on the experimental setup in SEC "Energy" NIIEFA them. D. C. Ephraim helped to increase the laser power by 15-20% and to reduce the angular divergence of the laser 20-25% Electron-beam-sustained gas laser with nonautonomous discharge and longitudinal configuration of pumping gas mixture located in the discharge chamber of the cathode and anode electrodes, made in the form of gratings, in which the gas flow is directed in the direction of the electric field between the electrodes, the electron beam from the ionization device is directed opposite to the direction of the electric field and the optical axis of the resonator perpendicular to the gas flow and electric field, characterized in that the space between the electrodes directly into the discharge zone, perpendicular to the planes of electrodes installed dielectric screens made To wavy layers of ceramics, to the inner region of the discharge chamber.
FIELD: quantum electronics, spectrometry, and plasma chemistry.
SUBSTANCE: proposed method for firing sparkless discharge in solid gases includes ignition of main charge between first and second electrodes by applying high-voltage pulse minus across first electrode and its plus, across second one, gas being pre-ionized with aid of low-energy electron beam, photons, and plasma electrons produced directly within main-discharge space; low-energy electron beam is produced by means of open barrier discharge with high-voltage pulse applied between first electrode made in the form of grid disposed on insulator surface and additional electrode disposed on opposite side of insulator; main charge is fired not earlier than ignition of open barrier discharge; the latter and main discharge are ignited within one gas-filled chamber. Device implementing proposed method has first and second electrodes forming main discharge gap, and high-voltage pulsed power supply; first electrode is made in the form of grid disposed on insulator surface whose opposite side mounts additional electrode; high-voltage pulsed power supply is connected through minus terminal to first grid electrode and through plus one, to second electrode; it functions to ignite main discharge; additional high-voltage pulsed power supply for open barrier discharge is connected through plus terminal to first grid electrode and through minus one, to additional electrode; first grid electrode, second electrode, additional electrode, and insulator are mounted in same gas-filled chamber.
EFFECT: enhanced main-charge stability due to enhanced efficiency of gas pre-ionization in main discharge gap from pre-ionization source disposed within main discharge space.
4 cl, 5 dwg
FIELD: electrical engineering, physics.
SUBSTANCE: laser incorporates elongated solid main electrodes, each furnished with, at least, one UV-preionisation device. The gas flow zone is formed by gas flow dielectric guides and the main discharge electrode working surfaces. The said preionisation devices are arranged outside the gas flow zone to enlighten the gap between the main discharge through the gap between the main discharge electrodes and the flow dielectric guides.
EFFECT: laser efficient operation under the conditions of high pulse rate.
11 cl, 3 dwg
SUBSTANCE: present invention pertains to quantum electronics, particularly to electrode systems of gaseous TE-lasers. In the electrode system of TE-laser with corona preoinisation, the inner conductors of the corona preionisation devices are only connected between themselves. The outer conductors of the corona preionisation devices are connected to the main discharge electrodes.
EFFECT: provision for effective preionisation of the discharge gap, which does not require a high voltage lead through the case to the electrodes of the preionisation device.
5 cl, 2 dwg
SUBSTANCE: laser has a gas pumping loop in which there are series-arranged discharge gap formed by two extended electrodes, diffuser, heat exchanger, cross flow fan with an impeller and an extra channel. The inlet opening of the extra channel lies on the pressure side of the fan. The distance between the electrodes is between 0.05 and 0.25 times the external diametre of the impeller. The extra channel is in form of a convergent tube with an outlet hole directed towards the impeller of the fan on the suction side of the fan.
EFFECT: design of a compact TE-type gas laser with efficient laser gas pumping, stable operation and high pulse repetition rate.
4 cl, 1 dwg
SUBSTANCE: laser includes gas-filled chamber with the main discharge electrodes installed in it, charging circuit and discharging circuit. Charging circuit includes pulse voltage source and peaking capacitors. Discharging circuit includes peaking capacitors and the main discharge electrodes, at least one corona pre-ioniser in the form of dielectric tube with inner and outer electrodes. Outer electrode of pre-ioniser covers part of surface of dielectric tube and is connected to the main discharge electrode. At that, outer electrode of corona pre-ioniser is current lead of charging circuit.
EFFECT: improving efficiency of pre-ionisation and stability of operation.
FIELD: physics, optics.
SUBSTANCE: invention relates to laser engineering. The discharge system of a high-efficiency gas laser includes, arranged in the housing of the laser, extended first and second electrodes which define a discharge area in between. On the side of one of the electrodes there is a UV preioniser, which is in the form of a system for igniting a uniform creeping discharge between the extended ignitor electrode and an additional electrode, placed on the surface of a dielectric layer which covers an extended metal substrate connected to the additional electrode. The dielectric layer is in the form of a straight thin-wall dielectric tube with a longitudinal section. The ignitor electrode and the additional electrode are placed on the outer surface of the dielectric tube along the tube, and the metal substrate is placed inside the dielectric tube such that at least part of the surface of the metal substrate is superimposed with the extended part of the inner surface of the dielectric tube. The additional electrode is connected to the metal substrate through the longitudinal section of the dielectric tube.
EFFECT: increasing generation energy and average radiation power of the gas laser and simple design of the gas laser.
5 cl, 4 dwg
SUBSTANCE: invention refers to a gas molecule and atom excitation device in gas laser pumping systems. The device represents a tray in the form of an elongated parallelepiped or cylinder having an outer casing made of an insulation material. Parallel mesh electrodes - anode and cathode - are integrated into the casing along the tray walls. The space between the electrodes represents a discharge chamber for glow burning. Between each electrode mesh and the inner face of the tray, there are chambers used as a gas flow conditioner. Gas is individually supplied into each of the chambers. One of the side walls of the gas tray is slotted to release an excited gas molecule or atom flow from the discharge chamber into a resonant chamber generating a radiation flow.
EFFECT: downsizing and reducing power of the device and maintaining energy deposition.
3 cl, 2 dwg
FIELD: physics, optics.
SUBSTANCE: invention relates to laser engineering. The discharge system of an excimer laser includes a space discharge area (4) in a laser chamber (1) between first and second electrodes (2), (3), the longitudinal axes of which are parallel to each other; each preionisation unit (5) comprises a system for generating uniform complete creeping discharge on the surface of an extended dielectric plate (6), having an arched shape in the cross-section. The arched dielectric plate (6) can be in the form of a dielectric tube.
EFFECT: enabling laser energy and power increase.
21 cl, 13 dwg
FIELD: physics, optics.
SUBSTANCE: invention relates to laser engineering. The laser includes a gas-filled housing which is fitted with a ceramic discharge chamber with an extended high-voltage flange, a high-voltage electrode and a grounded electrode, both placed extended and placed in the discharge chamber, and at least one preionisation unit. Each preionisation unit comprises a system for generating creeping discharge, which includes an extended dielectric plate having an arched shape in the cross-section. In another version of the invention, the high-voltage electrode is placed on the inner side of the high-voltage flange and is partially transparent. The preionisation unit is placed on the back side of the partially transparent high-voltage electrode. The extended walls of the ceramic discharge chamber are preferably inclined towards the high-voltage electrode, and capacitors are inclined towards the high-voltage electrode.
EFFECT: high generation energy and power of the laser.
24 cl, 6 dwg
FIELD: power industry.
SUBSTANCE: invention relates to laser engineering. The gas laser discharge system contains the extended first and second laser electrodes, located in the laser housing, UF pre-ionizer located aside from one of laser electrodes and designed as the system of ignition of sliding discharge between extended igniting electrode and additional electrode located on the surface of the dielectric layer coating an extended metal substrate. The dielectric layer is designed as a part of direct thin-walled cylindrical tube enclosed between two planes of the tube cuts made along its length parallel to the axis. The igniting electrode is placed on the internal surface of the part of the dielectric tube along it and connected to the laser electrode, and the surface of the extended metal substrate is made concave and superposed with the part of external cylindrical surface of the dielectric layer.
EFFECT: possibility of increase of generation energy and simplification of the laser design.
4 cl, 4 dwg