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.

 

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