JPH0644121Y2 - Slab type solid laser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a slab type fixed laser using a slab as an oscillation material element for oscillating a solid-state laser used for laser processing or the like.

<Prior Art> Conventionally, solid-state laser oscillators have generally been roughly classified into rubbing, yttrium aluminum garnet (abbreviated as YAG above), glass, etc. A rod-shaped rod type is used. These solid-state laser materials are housed in a condenser together with a xenon lamp that serves as excitation light and oscillate while cooling the heat generation. However, in the rod type, the temperature distribution due to excitation causes thermal and optical deformation inside and the light condensing characteristics deteriorate. Therefore, a slab type having a rectangular cross section is used, which does not cause a change due to heat or a thermal lens effect unlike the rod type, and can obtain a high power laser beam of linearly polarized light with a small spread angle of light.

<Problems to be solved by the invention> When these lasers are oscillated, the excitation light 1 is incident from the surface of the rod shown by the broken line toward the center as shown by the broken line of the rod type in FIG. , Even if the side surface is a mirror surface, sufficient oscillation is possible. However, when the material element is a slab type, as shown by the solid line, when the excitation light 1 is incident at an angle of 0 ° to 45 ° with respect to the surface, reflected light 8 is generated, and the excitation light 1 is sufficiently inside the slab. There is a drawback that it is difficult to oscillate because it does not penetrate into. In particular, since the slab type with 6 mirror surfaces does not oscillate, the pumping light 1 is scattered by polishing the two reflecting surfaces in a zigzag manner and roughening the other 2 surfaces. The method of letting is taken. As a result, the pumping light 1 is made to enter the slab type at an angle close to perpendicular to the surface, but it is difficult to uniformly pump it and there is a drawback that the intensity distribution of the laser beam becomes uneven. .

<Means for Solving the Problems> In the present invention, except for the above-mentioned drawbacks, the present invention is a slab having a rectangular hexagonal cross section serving as an oscillation material element for oscillating a laser by exciting pump light in a condenser. Is a slab-type solid-state laser in which a scattering plate that scatters light is attached and coated on each of four long sides including a mirror-polished surface of the slab.

<Operation> Since the excitation light projected from the outside onto the slab which is the solid-state laser material element is scattered by the light scattering plate such as ground glass, the inside of the slab is uniformly excited.

<Examples> Examples of the slab type fixed laser of the present invention will be described with reference to the drawings.

First, the slab applied to the laser according to the present invention will be described with reference to the vertical sectional front view of FIG. As seen in this figure, the material element of the solid-state laser is formed by a slab 2 having a rectangular cross section such as YAG. A scattering plate 4 that scatters light, such as thin frosted glass, is attached to the four side surfaces of the slab 2 including the mirror-polished surface. Therefore, when the excitation light 1 is projected on the scattering plate 4 as shown by the arrow A, the incident excitation light 1
Is scattered in each direction as indicated by arrow B, so that there is no reflection from the side surface to the outside, and the inside of the slab is uniformly and efficiently excited.

FIG. 1 is a side view showing the configuration of an embodiment of a slab type solid-state laser to which the slab of FIG. 2 is applied. In this figure, one side of a slab material measuring 2.8 mm in length and width and 63 mm in length is coated so that the laser light shown by the broken line is reflected 100% at a right angle to the zigzag reflection surface, and the other side is opposed to the zigzag surface. A YAG slab 2 of hexagonal mirror surface polished at an angle of 2.2 ° is housed in a concentrator 6 having an elliptic cylindrical shape together with a xenon flash lamp 5 for excitation. This is repeated 10pp
^s , oscillate in one zigzag path, and the characteristics of the laser output with respect to the input of the lamp 5 are obtained as shown in FIG.
It can be seen that the output of the curve Y of the laser oscillator according to the present invention is larger than that of the curve X of the conventional laser oscillator.

<Effect of the Invention> As described above, according to the present invention, the laser output is reduced by applying the hexahedral mirror-polished slab to the condenser 6 used in the rod-type solid-state laser. It is possible to oscillate intensively with a large output, and the effect obtained for improving performance is great.

[Brief description of drawings]

FIG. 1 is a side view showing the construction of an embodiment of a slab type solid-state laser of the present invention, FIG. 2 is a vertical sectional front view of a slab applied to the embodiment of FIG. 1, and FIG. FIG. 4 is a characteristic diagram showing the relationship between the laser output and the input of the pumping lamp of the slab type solid-state laser, and FIG. 4 is a schematic front view showing the entrance path of the pumping light in the conventional slab type and rod type. In addition, 1: excitation light, 2: slab, 3: rod, 4: scattering plate, 5: lamp, 6: condenser, 7: laser light, 8: reflected light.

Claims (1)

[Scope of utility model registration request] 1. A slab having a hexagonal rectangular plate having a rectangular cross section, which is an oscillation material element for oscillating a laser when excited by excitation light, is provided in a condenser, and a long side including a mirror-polished surface of the slab. A slab type solid-state laser in which a scattering plate that scatters light is attached and coated on each of the four side surfaces.