JP2765351B2 - Laser-pumped solid-state laser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a laser-pumped solid-state laser.

[0002]

2. Description of the Related Art As a laser beam pumped solid-state laser, for example, the one shown in FIG. 2 is conventionally known. In FIG. 2, reference numeral 21 denotes a solid-state laser medium, which has a cylindrical shape. On a substantially semi-peripheral side surface of the solid-state laser medium 21,
A semi-cylindrical reflector 22 is adhered, and the remaining semi-peripheral side surface is irradiated with laser light 23 from a semiconductor laser as an excitation light source. Then, a total reflection mirror 24 is arranged on one end side of the solid-state laser medium 21 in the longitudinal direction, and an output mirror 25 is arranged on the other end side, respectively.

In the above configuration, the solid-state laser medium 21
The laser light transmitted through the inside is absorbed by the medium and excites the medium. The laser light that was not absorbed in one transmission is
The light is reflected by the reflector 22, enters the solid-state laser medium 21 again, and is absorbed. The light-excited portion inside the solid-state laser medium 21 becomes a gain medium for the solid-state laser light, is amplified by the action of the laser resonator, and the solid-state laser light is output from the output mirror 25.

[0004]

In the above-mentioned conventional laser-pumped solid-state laser, since the solid-state laser medium has a cylindrical shape, the side surface acts as a convex lens for the laser light. Therefore, as shown in FIG. 2B, the laser light cannot uniformly excite the entire solid laser medium, and an uneven excitation distribution occurs in the gain medium, and the laser light is formed at a position where the optical axis of the solid laser light is deviated. Is done. Therefore, there is a problem that the design of the laser resonator that achieves high efficiency and high output operation becomes very troublesome when the oscillation lateral mode is made single.

It is an object of the present invention to provide a laser beam pumped solid-state laser having a solid-state laser medium having a structure capable of attaining a uniform pumping distribution by a laser beam.

[0006]

In order to achieve the above object, a laser beam pumped solid-state laser of the present invention has the following configuration. That is, the laser-pumped solid-state laser of the present invention is a laser-pumped solid-state laser;
The solid-state laser medium has a concave lens as a laser beam incident portion on both side surfaces of one of the two opposite side surfaces of the solid-state laser medium; and a complete surface on both side surfaces of the other opposite side surface. A diffusion surface is formed;

[0007]

Next, the operation of the laser-pumped solid-state laser of the present invention having the above-described structure will be described. In the present invention, the solid-state laser medium has a quadrangular prism shape, and a concave lens is adhered to both sides of one of the opposite sides, and a perfect diffusion surface is formed on both sides of the other opposite side, and light is incident through the concave lens. The laser beam spreads in the medium and is diffused on the perfect diffusion surface. Therefore, since the inside of the medium is uniformly photoexcited,
It can eliminate the deviation of the optical axis of solid-state laser light,
The design of the laser resonator for high-power operation is facilitated.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a laser-pumped solid-state laser according to one embodiment of the present invention. In FIG. 1, the solid-state laser medium 1 is
The solid-state laser medium 1 has a concave lens 2a and a concave lens 2b as laser light incident portions which are in close contact with both side surfaces of one of the two opposing side surfaces of the solid laser medium 1 by optical contact. The perfect diffusion surfaces 3a and 3b are formed on both side surfaces of the opposite side surface.

The complete diffusion surfaces 3a and 3b are formed by applying a paint containing BaSO ₄ as a main component on the side surface of the polished sand medium.

In the above configuration, the laser beam 4a (4
b), when input into the solid-state laser medium 1 through the concave lens 2a (2b), expands in the medium due to the action of the concave lens, but as shown in FIG.
It reaches the formation surface of b), is diffused by the perfect diffusion surface there, and penetrates all corners in the medium. That is, the laser light 4a (4b) uniformly optically pumps the inside of the solid-state laser medium 1. After that, it is the same as the case of FIG.

As described above, the light-excited portion in the medium becomes the gain medium. However, in the present invention, since the inside of the medium is uniformly excited, there is no deviation of the optical axis of the solid-state laser and high efficiency and high efficiency.
The design of the laser resonator for high-power operation is facilitated.

[0012]

As described above, according to the laser-excited solid-state laser of the present invention, the solid-state laser medium is formed in a quadrangular prism shape, and concave lenses are adhered to both sides of one of the opposite sides, and A perfect diffusion surface is formed on both sides of the opposite side surface, and the laser light incident through the concave lens is spread in the medium and diffused on the perfect diffusion surface. There is an effect that the deviation of the optical axis can be eliminated and the design of the laser resonator for high efficiency and high output operation becomes easy.

[Brief description of the drawings]

FIGS. 1A and 1B are conceptual configuration diagrams of a laser-pumped solid-state laser according to one embodiment of the present invention, wherein FIG. 1A is a side view and FIG.

FIG. 2 is a conceptual configuration diagram of a conventional laser beam pumped solid-state laser, in which (a) is a side view and (b) is a cross-sectional view.

[Explanation of symbols]

 Reference Signs List 1 solid laser medium 2a concave lens 2b concave lens 3a perfect diffusion surface 3b perfect diffusion surface 4a laser beam 4b laser beam

Claims (1)

(57) [Claims] A solid-state laser medium having a quadrangular prism shape; and a concave lens serving as a laser beam incident portion provided on both sides of one of two opposite sides of the solid-state laser medium. A laser light pumped solid-state laser, wherein the laser light pumped solid-state laser is in close contact with each other;