RU1840810C - Flow-type electron-beam pumped gas laser - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention relates to quantum electronics. The disclosed electron-beam pumped gas laser has a discharge chamber in housing of which there are windows for inlet of a beam of charged particles from a pre-ionisation device and radiation output which are placed in the body and are connected to the electrode power supply system, one of which lies at the aperture of the window for inlet of the beam of charged particles and is perforated. The laser also has a magnet system for holding the beam of charged particles within the active volume of the discharge chamber. Electrodes are merged with the magnet system for holding the beam of charged particles. Each electrode is formed by a set of parallel and insulated mini-resistors made from material with high magnetic permittivity and high resistivity, and is connected to the power supply system through a current collector which is in form of a permanent magnet or solenoid around the electrode.

EFFECT: high power and efficiency, low radiation divergence and smaller dimensions of the laser.

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Description

The invention relates to quantum electronics and can be used to create high-power gas lasers with preliminary ionization of the active medium.

A flowing gas laser is known (see aut. Certificate. No. 1419447 H01S 3/22, 1986) - a prototype in which a gas discharge chamber contains a housing with windows for outputting radiation, changing gas, introducing electron beams from an ionization device. The housing contains a system of electrodes, one of which (cathode) is installed in the window aperture. At the bottom and upstream of the gas flow at the boundary of the chamber’s active volume there are multi-blade screens with blades in the form of permanent flat non-conducting magnets or equivalent isolated solenoids. Against the blades on the side of the electrodes is an additional magnetic system made on permanent magnets or equivalent solenoids. A coordinated magnetic field created by the screen blades and the magnetic system at the boundary of the active volume prevents the electrons of the preionization device having a transverse velocity component from leaving the active zone. The disadvantages of this design are: a decrease in the electric strength of the gap due to distortions of the electric field introduced by the blades, leading to a decrease in the power of the gas laser; deterioration of the optical quality of the flow in the core caused by gas-dynamic disturbances from the wake and the boundary layers formed on the blades located at the entrance to the discharge chamber.

The aim of the present invention is to increase the output power and efficiency of the laser, reducing the divergence and dimensions of the laser.

This goal is achieved by the fact that in the laser, which includes a gas preionization device, a power supply system and a discharge chamber containing a housing with windows for inputting charged particles and outputting radiation, an electrode system in the housing and a magnetic system, the magnetic system is placed in electrodes made of a large number of mini-resistors parallel-stacked and isolated from each other with a common current collector connected to the power supply system, while the mini-resistors are made of materials with high magnetic permeability and high specific resistance, and current collectors either in the form of permanent magnets or in the form of isolated solenoids, the conductors of which are connected to the electrodes and the power supply system.

A feature of the claimed technical solution is that the electrodes of the discharge chamber, together with permanent magnets or insulated solenoids, form a magnetic system, which, unlike the known ones, can improve the uniformity of the distribution of electrons in the active volume of the discharge chamber and the possibility of creating a compact, magnetic system. Thus, the electrodes, in addition to their main function (excitation of the gas mixture), also perform the function of the magnetic system (keeping the electron flow within the active volume).

Compared with the prototype and other known technical solutions, the claimed technical solution is "new." The electrodes, consisting of parallel-mounted mini-resistors with a common current collector, are known (AA Velikin et al. "Energy Opportunities", vol. 26, No. 1, TVT, 1988, p. 37) are intended primarily for gas lasers. However, the use of electrodes made of materials with high magnetic permeability and high resistivity, which are functional elements of the magnetic system, is also "new" and allows you to get a positive effect. The above allows us to conclude that the claimed technical solution meets the criteria of the invention of "novelty" and "significant differences".

Figure 1 shows the design of the laser. The laser includes: a discharge chamber with a working gas, in the housing 1 of which there are windows for introducing infected particles from a preionization source 2 (electron gun) installed tightly on the housing, and outputting radiation; electrodes 3, the conductive elements 4 of which are made of a material with high resistivity and high magnetic permeability, insulated from each other by a dielectric 5. As current collectors, magnets 6 or solenoids 7 made of insulated conductors connecting the electrodes to the power supply system are used; a beam of ionizing particles is introduced through window 8.

The laser operates as follows. The active medium is electrically pumped by electrodes connected to a power supply system. Preliminary ionization of the medium is carried out by a beam of ionizing particles (electrons). The confinement of electrons in the active volume is carried out by a magnetic system consisting of permanent magnets or solenoids placed in the electrodes. The magnetic field of the magnetic system is increased by a factor of µ (µ is the relative magnetic permeability of ferrite) with the help of conductive rods made of ferrite, which are simultaneously high-resistance conductors of the anisotropic-resistive electrode. The magnetic field of the magnet system is created in the discharge zone between the anode and cathode, and the magnetic field lines are directed perpendicular to the surface of the electrodes. Under the influence of a magnetic field, fast electrons move along helical lines within the region covered by the magnetic field. This increases the uniformity of ionization of the active medium, the efficiency of using an electron beam, and accordingly, the power and efficiency of the laser increases, and the directivity of the laser radiation improves.

Compared with the prototype, the claimed technical solution has the following advantages: through the use of a coordinated magnetic system in the electrodes and the use of mini-resistors made of materials with high magnetic permeability, the output radiation power, laser efficiency are increased, and the dimensions and divergence of the laser are reduced.

Claims (1)

A flow-through electroionization gas laser containing a discharge chamber, in the case of which there are windows for inputting a beam of charged particles from a preionization device and outputting radiation, located in the case and connected to the electrode power supply system, one of which is located in the aperture of the window for inputting a beam of charged particles perforated, as well as a magnetic system for holding a beam of charged particles within the active volume of the discharge chamber, characterized in that, in order to increase power and efficiency, reduce To reduce the divergence of radiation, as well as reduce the dimensions of the laser, the electrodes are combined with a magnetic system to hold a beam of charged particles, with each electrode formed by a set of ministors parallel to each other and insulated from one another, made of a material with high magnetic permeability and high resistivity, and connected with a power supply system by means of a current collector, made in vice, covering the perimeter of the electrode of a permanent magnet or solenoid.

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