Method and device for focusing laser radiation

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

 

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).

Known methods focusing of a laser beam, based on the transformation of the parallel light beam in a beam of annular cross-section with its subsequent note to the specified point.

Device for the implementation of the methods 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.p.104-108 and W.R.Edmonds. The Reflakxicon, a New Reflective Optical Element, and Some Applications. Appl. Opt, v.l2, No. 8, 1973, p.p.1940-1945.

The closest technical solution(prototype) of the present invention is a method of focusing of a laser beam, comprising converting a parallel beam of laser radiation solid section in a beam of annular cross-section for further information in the set point, see U.S. Pat. Of the Russian Federation No. 2240615 (application No. 2003110805/06 16. 04.2003,), IPC G 21 K 1/00.

The device for implementing the above method comprises optically coupled input and output axicon made in the form of inner and outer rotation bodies each, while the inner body rotation Aksyonov mounted on the ends of the hollow rod associated with the outer rotation bodies of Aksyonov through the pylons, and the floor is the motion of the rod is divided into two compartments by transverse partition with nozzles for supplying refrigerant in said compartments.

The shortcoming of the above technical solution is reduced power density at the focused beam of laser radiation due to the presence of the tip (point of contact) on the inner body rotation of the input axicon, leading to overheating of the latter (due to the difficulty of heat removal at high levels of power density of the focused radiation and, consequently, to progressive destruction of the inner body input axicon from its apex to the periphery (to avoid the above-mentioned negative phenomena the top of the inner body input axicon need to dull flat transverse faces, which leads to the decrease of energy in the focal spot and reduces the upper limit of the level of power density of the focused laser radiation).

The technical result from the use of 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 in the method of focusing of a laser beam, comprising converting a parallel beam of laser radiation solid section in a beam of annular cross-section for further information in the set point, before converting the parallel beam of the laser is about radiation solid section in a beam of annular cross-section, from a parallel beam of laser radiation solid section cut out of the Central part of the circular cross-section for its subsequent submission to the target point information of a beam of annular cross-section.

A device for focusing of a laser beam containing optically coupled input and output axicon made in the form of inner and outer rotation bodies each, while the inner body rotation Aksyonov mounted on the ends of the hollow rod associated with the outer rotation bodies of Aksyonov through the pylons, and the cavity of the rod is divided into two compartments by transverse partition with nozzles for supplying refrigerant in said compartments, the inner body rotation Aksyonov and the wall of the rod is made with a through axial holes, the hole diameter of the inner body rotation of the input axicon is comparable with the spot diameter of the focused laser beam and the axial holes of the partitions of the rod and internal rotation bodies of Aksyonov isolated from the compartments of the hollow rod sealed elements.

In addition, the sealed hollow elements made in the form of thin-walled tubes mounted coaxially aligned axial bores in the inner rotating bodies of Aksyonov and stud partitions.

In addition, the internal diameter thin-walled tubes, the diameters of the holes of the partition rod the inner body rotation of the output axicon equal to or greater than the diameter of the hole of the inner body rotation of the input axicon.

The drawing shows a device for realization of the proposed method.

The device comprises optically coupled input and output axicon made in the form of a conical external 1, 2, and 3 internal, 4 rotating bodies. The inner body of rotation 3, 4 Aksyonov mounted on the ends of the podyjí rod 5 that is associated with the outer rotation bodies 1, 2 Aksyonov through pylons 6 and the housing 7. The cavity of the rod 5 is divided by transverse partition 8 into two compartments 9, 10, which serves a refrigerant for cooling the internal bodies Aksyonov) through the channels 11, 12 through nozzles 13, 14 provided on the partition wall 8. The output of the refrigerant through the channels 15, 16 (input and output channels for the refrigerant structurally, it is advisable to perform inside the pylons 6).

On the inner rotary bodies 3, 4 Aksyonov device has axial holes 17, 18 and the partition wall 8 of the rod 5 is provided an axial channel (hole) 19, the latter being tightly connected by means of a thin-walled tubes 20, 21 with the holes 17, 18 of the inner rotary bodies 3, 4 Aksyonov. The diameter d of the internal body rotation - 3 input axicon made commensurate with the spot diameter of the focused beam of laser radiation (preferably equal to the effective diameter of the spot of the focused laser beam at the point F).

For the free passage of the Central part (area) of the beam of laser radiation internal diameters of the tubes 20, 21, the diameter of the channel 19 of the partition 8 of the rod 5 and the inner diameter of the hole of the body of rotation 4 of the output of the axicon is made equal to or larger than the diameter d of the axial bore of the inner body rotation 3 input axicon.

Implementation of the proposed method using the device is as follows.

Parallel I beam of laser radiation of a solid circular cross-section and serves on the inner body rotation 3 (with a conical reflecting surface) of the input axicon, which after reflection from the surface of the latter with the aid of outer body rotation 1 input axicon is converted into the beam II ring sections for submission to the external body of rotation 2 of the output of the axicon. After reflection from the outer surface of the body of revolution 2 beam II carried out his information in the set point F through the inner body of rotation 4 of the output of the axicon (point F is placed in the focal plane of the device and has an effective diameter of the focused spot (reduced) radiation, equal to d). When applying radiation to the inner body of rotation 3 of the input of the axicon beam I cut out (produce) in its Central part (area) III with diameter d in the cross section through the axial bore 17 of the body 3 (the diameter of the hole 17 is chosen from the condition of commensurability with the diameter of the focused spot (reduced) is zlecenia beam II).

Cut from the beam I part III radiation is passed through the tube 20, the channel 19, the tube 21 and serves to point F of the information beam II to summarize from the last.

The heat from the internal bodies 3, 4 Aksyonov carried out by pumping refrigerant (coolant) through the compartments 9, 10 through the inlet 11, 12 and output 15, 16 channels of the hydraulic system (in graphical materials conventionally not shown).

From the above it follows that the proposed solution has the advantage compared with the known, namely:

- due to the full utilization of the energy of the light beam (including its Central part) increases the power density in the focal spot is reduced at a given point of emission;

the absence of sharp peaks on the inner body input axicon reduces the degree of heating of the body and improves the heat sink, which allows the focusing of a beam of laser radiation with high power density.

Therefore, when using the invention gives the technical result consists in the possibility of using laser beams with high power density of light energy.

1. The method of focusing of a laser beam, comprising converting a parallel beam of laser radiation solid section in a beam of annular cross section for posleduyushego the information in the set point, characterized in that before converting parallel beam of laser radiation solid section in a beam of circular cross-section, of a parallel beam of laser radiation solid section cut out of the Central part of the circular cross-section for its subsequent submission to the target point information of a beam of annular cross-section.

2. A device for focusing of a laser beam containing optically coupled input and output axicon made in the form of two conical reflecting surfaces each, with one reflecting conical surface Aksyonov mounted on the ends of the hollow rod associated with the other conical reflecting surface Aksyonov through the pylons, and the cavity of the rod divided by a partition with nozzles for supplying refrigerant in said compartments, characterized in that the reflecting conical surface of Aksyonov mounted on the ends of the hollow rod and the wall of the rod is made with a through axial holes, the diameter of the axial bore of conical reflecting surface Aksyonov mounted on the ends of the hollow rod, commensurate with the spot diameter of the focused laser beam and the axial hole of the partition rod and conical reflecting surfaces Aksyonov mounted on the ends of the hollow rod, isolated from the compartments CTE is life sealed hollow elements.

3. The device according to claim 2, characterized in that the hollow sealed elements are in the form of thin-walled tubes mounted coaxial conical reflecting surfaces of Aksyonov at the ends of the hollow rod and the axial hole of the partition walls of the terminal.



 

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