JPS6021583A - Gas laser oscillating device - Google Patents

Abstract

PURPOSE:To facilitate the dust-proof and moisture-proof treatment of the surface of a contracting reflection mirror and to miniaturize the titled device by a method wherein this device is equipped with the contracting reflection concave mirror of the laser resonator inside the body of housing, and the contracting convex mirror inside the projection on the side of the housing. CONSTITUTION:The concave mirror 13 is placed in the cylindrical body 24 of the housing 2, and the convex mirror 15 that receives the reflected light of the mirror 13 in the swell-out projection 2B on the side of the package. The contraction of the flux of light is carried out inside the housing 2, and, in addition to the miniaturization of the whole device, the mirrors of the contraction system do not become cloudy; therefore the decrease of laser output is prevented. Since a contracted laser beam 6d passes through an output window 9, and the diameter of the window 9 can be reduced, the expensive material of a crystal plate 9 can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in the output beam extraction section of a high-power gas laser transmitter.

[Background of the invention]

In order to obtain a beam with high efficiency and good focusing, an unstable resonator configuration is generally adopted.

In order to increase the output of a gas laser device, the volume of the laser medium section is increased to increase the diameter of the beam.

FIG. 1 illustrates the structure of a conventional high-power gas laser device.

In the figure, 1 is the laser medium, which is CO2 and N2.

) 1e etc. are used. 2 is an envelope in which the medium is completely enclosed. The envelope consists of an elongated cylindrical main body 2A and a protrusion 2B formed by bulging a part of the main body laterally. Inside the two main bodies, a concave mirror 3 at one end and a convex mirror 4 at the other end are arranged as reflecting mirrors for generating laser light 6 so that their mirror axes coincide. An annular plane mirror 5 is arranged between the two reflecting mirrors with its mirror axis tilted downward by 45 degrees. A circular window 7 in the center of this plane mirror 5
The laser beam 6 passes through, and the circular portion 8 of the plane mirror 5 reflects a part of the laser beam 6 to form a parallel beam of laser beam 6a. The laser beam 6a is transmitted through a crystal plate 9 attached to the protruding portion 2B of the envelope, and is emitted outside the device to become a laser beam 6b. The laser beam 6b enters the concave mirror 10, is reflected, becomes a convergent beam of laser beam 6C, and enters the convex mirror 11, and the reflected beam 6d becomes a parallel beam of laser beam reduced to a predetermined ratio and is focused for processing. The light is irradiated by an optical device, focused, and used for cutting and welding.

In the above configuration, a concave mirror 10 and a convex mirror 1 for beam reduction are used.
1 is outside the envelope 2, the laser device as a whole becomes large-sized, and it is difficult to keep the mirror surfaces of the two mirrors 10 and 11 for reduction dust-proof and moisture-proof.

The present invention eliminates the above-mentioned drawbacks by the following configuration.

[Summary of the invention]

The feature of the present invention is that, as shown in FIG. A convex mirror 15 for receiving the reduction is installed inside the bulging protrusion 2B on the side of the envelope.

[Embodiment of the Invention] The relative arrangement of the concave mirror 12 and the convex mirror 15 is the same as the relative arrangement of the concave mirror 1o and the convex mirror 11 in the conventional device shown in FIG.

However, in the conventional device shown in FIG.
In contrast, in the device of the present invention shown in FIG. 2, the laser beam oscillation is performed inside the envelope 2, which makes the entire laser beam oscillation device compact, and does not cause fogging on the reflecting mirror of the reduction system. This has the effect of preventing a decrease in laser output.

In the conventional device, the laser beam 6a before reduction is output through the output window 9.
However, in the device of the present invention, the laser beam 6d was reduced.
is transmitted through the output window 9.

〔Effect of the invention〕

The crystal plate serving as the output window 9 is an expensive one made entirely of a special crystal material such as Z nI Se. According to the present invention, since the diameter of the output window 9 is reduced, there is also the effect that the expensive material of the crystal plate 9 can be saved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional gas laser oscillation device. FIG. 2 is a longitudinal sectional view of the gas laser oscillation device of the present invention. 2... Envelope, 3.10... Concave mirror, 4, 11.1
5... Convex mirror. Agent Patent Attorney Akio Takahashi A

Claims (1)

[Claims] 1. In a laser resonator in which a reflecting mirror for resonating a laser beam is placed oppositely within an envelope enclosing a laser medium, a concave mirror for reduction formed in an annular reflecting mirror is installed inside the cylindrical main body of the envelope. A gas laser oscillation device characterized in that a reduction convex mirror into which the reflected light from the concave mirror is incident is installed in a bulging protrusion on the side of the envelope.