A device for focusing laser radiation

 

The invention relates to the field of laser technology and can be used as a focusing system for high-power laser radiation with a laser technological complexes. A device for focusing the laser radiation contains input and output axicon, peripheral reflecting surface which are located on the body. The device is also equipped with a device for supplying refrigerant, two nozzles, stem and pylons, the internal reflective surface of Aksyonov mounted on the rod, the latter is connected with the body pillars are hollow and is divided into two compartments sealed by a partition. Nozzle attached to the lateral surfaces sealed septum, placed in the compartments to form channels for the passage of the refrigerant, and their outputs are sent to the internal reflecting surfaces of Aksyonov. In one pylon made channels whose inputs are connected to the device for supplying coolant and outputs hydraulically connected with compartments that are hydraulically connected to the channels for the refrigerant is provided in the second and/or third pylon. The technical result - the increase of the radial density and power (energy) focused and the my invention relates to the field of laser technology and can be used as a focusing system for high-power laser radiation with a laser technological complexes.

Know a focusing device, comprising a housing (tube), fixed in the housing main mirror that is optically conjugate with the main mirror small mirror placed in the frame fixed to the body by three pylons (see Optical and infrared telescopes 90-ies. Ed. by A. Hewitt. M.: Mir, 1983, page 110).

A device for focusing the laser radiation, containing the axicon, the output peripheral reflecting surface which is optically interfaced with the input of the internal conical reflecting surface so that the focus is parallel to the input beam of radiation is located at the peripheral reflecting surface (see L. W. Casperson and M. S. Shechani Breakdown in a Radial-Mode Focusing Element.// Appl. Opt., v. 13, No. 1, 1974, pp. 104-108).

The closest technical solution (prototype) of the present invention is a device for focusing the laser radiation, containing the input and output axicon, peripheral reflecting surface which are located on the body (see W. R. Edmonds. The Reflaxicon, a New Reflective Optical Element, and Some Applications. // Appl. Opt., v. 12, No. 8, 1973, pp. 1940-1945).

The disadvantage of all the above structures is the limit of the focused laser radiation power (energy), which reduces to operate the solution is to enhance performance and increase service life.

In accordance with the invention the above-mentioned technical result is achieved in that the device for focusing the laser radiation, containing the input and output axicon, peripheral reflecting surface being located on the housing additionally contains a device for supplying coolant, two nozzle airtight partition, rod and pylons, the internal reflective surface of Aksyonov mounted on the rod, the latter is connected with the body pillars are hollow and is divided into two compartments sealed by a partition, a nozzle mounted on the side surfaces of the sealed septum, placed in the compartments to form channels for the passage of the refrigerant, and their outputs are sent to the internal reflecting surfaces of Aksyonov, one pylon made channels whose inputs are connected to the device for supplying coolant and outputs hydraulically connected with compartments that are hydraulically connected to the channels for the refrigerant is provided in the second and/or third pylon.

In addition, the cavity of the rod is cylindrical shape with a bottom narrowing of the facing sides of the inner reflecting surfaces of Aksyonov.

Casinogo radiation further comprises a device vignetting laser radiation, located in front of the pylon from the radiation input.

In addition, the device vignetting laser radiation is made in the form attached to the body cooled fingers cylindrical shape.

In addition, the cooled fingers made with a diameter equal to or greater than the thickness of the pylons in cross section.

In addition, the device for focusing the laser radiation is composed of two rigidly connected halves with the parting line in the longitudinal section of the device, passing through the middle region of the body, pylons, rod and sealed partitions.

In Fig.1 presents the proposed device for focusing the laser radiation on the input side of the laser radiation) of Fig.2), the same cross-section a-a in Fig.1, in Fig.3 - a device made of two halves.

The device has an input 1 and output 2 axicon made in the form of a peripheral conical reflecting surfaces 3 and 4, located on the housing 5, and the inner conical reflecting surfaces 6 and 7, mounted on the rod 8 connected to the housing 5 by means of pylons 9 (for example, three in number), and is optically conjugate to each other through the surface 3 and 4.

The rod 8 is provided with the strips is of conical shape, aimed at the internal reflecting surfaces 6 and 7 Aksyonov 1 and 2. The device is also equipped with nozzles 11 and 12 and sealed by a partition 13 dividing the cavity 10 into two compartments 14 and 15. The nozzles 11 and 12 are fixed on the side surfaces of the partition walls 13, are placed in the compartments 14 and 15 with the formation of channels (gaps) for passage of a refrigerant and directed their outputs in the direction of bottom sections of the cavity 10.

In one of the pylons 9 device has radial channels 16 and 17 are hydraulically connected through the nozzle 11 and 12 with the compartments 14 and 15, which, in turn, is hydraulically connected with the channels 18 and 19 (see Fig.1, figs.2) executed in the second and/or third pylons 9 to exit refrigerant (both channels 18 and 19 can be performed in one of the piers 9).

To prevent radial loads on the pylon 9 in the design of a device to vignetting of the laser radiation in the form of radial cylindrical fingers 20, mounted in the housing 5 in front of the pylon 9 on the input side of the focused radiation. The fingers 20 are made with an outer diameter D that is equal to or greater than the thickness of the piers 9 in cross-section, to ensure full coverage (vignetting) of the laser radiation incident on the pylons 9.

The operation of the device is as follows.

Laser radiation from a source (not shown) supplied to the internal conical reflecting surface 6 of the axicon 1 and reflected from the latter, falls on its peripheral conical reflecting surface 3, thus achieving the formation of a beam of annular cross-section.

A beam of annular cross-section is served on the peripheral conical reflecting surface 4 of the axicon 2 and on its inner reflecting surface 7, is made toroidal shape with a generatrix in the form of a parabola. Radiation reflected from the surface 7, is collected at the point F (Fig.2), forming a focal region with a high density level of the laser radiation, which can be used in technological processes, where appropriate, the use of laser materials processing.

Heat from the internal reflecting surfaces 6 and 7 and the adjacent surface layers of structural material (as the most "loaded" laser radiation) is produced by supplying a refrigerant feeder refrigerant conventionally not shown) in the channels 16 and 17 of one of the pillars 9 and then through the nozzle 11 and 12 of the surface layers, the refrigerant is discharged through channels 18 and 19 of the second and third pylons 9.

The fingers 20 that are installed in front of the pylon 9 and vinateria beam of laser radiation of a circular cross-section, completely occlude the latter, thus excluding them "burn" and thermal deformation.

Cooling of the fingers 20 is similar to the cooling of the internal reflecting surfaces 6 and 7 Aksyonov 1 and 2.

To improve the manufacturability of the device may be made of two halves I and II with the parting line B (see Fig.3) passing through the middle region (sites) of the base 5, pylons 9, body 8 and sealed partitions 13.

From the above it follows that the proposed design due to forced cooling elements, experiencing increased radiation exposure, allows you to focus laser beams with high density radiation, and consequently, a higher power (energy) that extends the performance capabilities and increases the service life of focusfor.

Thus, the proposed device with the implementation gives a positive technical result, namely expanding operational capabilities and increases service life.

For application materials, the enterprise manufactured prototype of the product (brazed construction of copper-based)rmula inventions

1. A device for focusing the laser radiation, containing the input and output axicon, peripheral reflecting surface being located on the housing, characterized in that it is provided with a device for supplying refrigerant, two nozzles, stem and pylons, the internal reflective surface of Aksyonov mounted on the rod, the latter is connected with the body pillars are hollow and is divided into two compartments sealed by a partition, a nozzle mounted on the side surfaces of the sealed septum, placed in the compartments to form channels for the passage of the refrigerant, and their outputs are sent to the internal reflecting surfaces of Aksyonov, one pylon made channels, the inputs of which are connected to a device for supplying coolant and outputs hydraulically connected with compartments that are hydraulically connected to the channels for the refrigerant is provided in the second and/or third pylon.

2. The device under item 1, characterized in that the cavity of the rod is cylindrical shape with a bottom narrowing of the facing sides of the inner reflecting surfaces of Aksyonov.

3. The device according to p. 2, characterized in that the bottom of the narrow cavity of the rod is made to the VA vignetting laser radiation, located in front of the pylon from the radiation input.

5. The device according to p. 4, characterized in that the device vignetting laser radiation is made in the form attached to the body cooled fingers cylindrical shape.

6. The device under item 5, characterized in that the cooled fingers made with a diameter equal to or greater than the thickness of the pylons in cross section.

7. Device according to any one of paragraphs.1-6, characterized in that it consists of two rigidly connected halves with the parting line in the longitudinal section of the device, passing through the middle region of the body, pylons, rod and sealed partitions.



 

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