JPH02150087A - Laser diode exciting solid state laser - Google Patents

Abstract

PURPOSE:To condense an exciting laser light outputted from an LD and directed into a laser medium without using other optical system such as lens, etc. by employing an optical fiber in which its exciting laser light emitting end face is formed in a convex lens state. CONSTITUTION:The light emitting end face of an optical fiber 2 for introducing an exciting laser from an LD 1 is formed in a convex lens state, an exciting laser light is condensed to be incident to a laser medium 3. A laser oscillator is composed of the exciting laser light incident side end face of the medium 3 and an output mirror 4. Thus, the exciting laser light incident side end face of the medium 3 is coated with an optical multilayer film having high permeabil ity for the exciting laser light of the LD 1 and high reflectivity for the laser oscillation light of the medium 3. The material of the medium 3 includes, for example, laser crystal such as YAG, YLF, YAP, GGG, etc. and laser glass.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a laser diode-pumped solid-state laser, and in particular to an optical fiber formed in the shape of a convex lens with a light-emitting end surface for the excitation laser light incident on the laser medium of the solid-state laser. This invention relates to a laser diode-pumped solid-state laser, which is characterized by being able to converge the pump laser light incident on a laser medium without using any other optical system by guiding the light using a laser diode.

[Conventional technology]

A basic configuration diagram of a conventional fiber-coupled laser diode-pumped solid-state laser is shown in FIG.

Excitation laser light from a laser diode (LD) 5, which is an excitation light source, is guided through an optical fiber 6, converged using an optical system such as a convex lens 7, and enters a laser medium 8. YA
The laser light oscillated within the laser medium 8 made of G crystal or the like resonates in a laser resonator composed of the excitation laser light incident side end face of the laser medium 8 and the output mirror 9, and the output mirror 9 resonates.
Emits from.

[Problems to be Solved by the Invention] Conventional laser diodes and de-pumped solid-state lasers have the configurations described above, and therefore have the following problems.

(a) Since an optical system such as a convex lens for converging the excitation laser light from the LD is added, the overall shape is thick (which is disadvantageous for compactness).

(b) There are many adjustment mechanisms for the optical axis, focus, etc., and therefore there are many adjustment points and the work is complicated.

(C) Since the optical system shown in (a) is required, the cost increases.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and in a fiber-coupled laser diode-pumped solid-state laser, the pump laser beam oscillated from the laser diode is transferred to the laser beam of the solid-state laser. The present invention provides a laser diode-pumped solid-state laser characterized in that the light output end face of an optical fiber is formed into a convex lens shape.

[Function] The optical fiber of the present invention whose excitation laser beam output end face is formed into a convex lens shape condenses the excitation laser beam from the LD that is incident on the laser medium without using any other optical system such as a lens.

[Example] An example of the present invention is shown in FIG. The excitation laser beam from the LDI is guided (the light output end face of the optical fiber 2 is formed into a convex lens shape, and the excitation laser beam is condensed into the laser medium 3
incident on the The laser resonator is composed of an excitation laser beam incident side end face of a laser medium 3 and an output mirror 4. Therefore, on the excitation laser light incident side end face of the laser medium 3,
It has high transmittance for the excitation laser beam of laser medium 3.
The laser oscillation light is coated with an optical multilayer film with high reflectivity.

In this embodiment, the material of the laser medium 3 is YAG.
, YLF, YAP, GGG, and other laser crystals and laser glasses can be used.

[Effect of the invention] The present invention has the following excellent effects.

(1) The entire device can be downsized.

(2) Adjustment of the optical axis, focus, etc. becomes easy.

(3) Since an optical system for converging the excitation laser light from the LD is not required, this greatly contributes to cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration diagram of an embodiment of a laser diode pumped solid-state laser according to the present invention, and FIG. 2 is a basic configuration diagram of a conventional example. 1: LD 2: Optical fiber Figure 1 Figure 2

Claims (1)

[Claims] A fiber-coupled laser diode-pumped solid-state laser, characterized in that a light-emitting end face of an optical fiber that guides a pump laser beam oscillated from a laser diode to a laser medium of the solid-state laser is formed into a convex lens shape.