JPH04101479A - Laser diode exciting solid state laser - Google Patents

Abstract

PURPOSE:To effectively utilize a wavelength converter and to extend its lifetime by providing a movable mechanism at the converter. CONSTITUTION:An optical output from a laser diode 1 is converted to the end face of a solid stage laser element 3 by a converging lens 2, and the excited element 3 generates an inverted distribution to oscillate between it and a mirror 5. A wavelength converter 4 is secured by a spring 11 and a screw 9 in a converter support 10. The converter 4 can be varied at upper and lower positions by regulating the screw 9. Since the converter 9 is disposed at a restricted position so as to raise the density of a light passing through the converter 4, the new surface of the converter can be, if it is normally moved about 0.1mm, irradiated with the light. Accordingly, the surface of the converter is not deteriorated, and its output is not reduced in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a laser diode pumped solid state laser, and more particularly to a laser diode pumped solid state laser having a light wavelength conversion element.

[Conventional technology]

As shown in FIG. 3, a conventional laser diode pumped solid-state laser having a wavelength conversion element includes a laser diode 1.
Condensing lens 2. Solid-state laser element 3 (Nd: YAG, etc.), wavelength conversion element 4. It has a mirror 5 (for example, Japanese Patent Application No. 61-299049).

The light from the laser diode is focused on the end face of the solid-state laser device 3 by the converging lens 2, and excites the solid-state laser device 3. When the solid-state laser element 3 is excited, population inversion occurs and laser oscillation occurs between the solid-state laser element 3 and the mirror 5. The wavelength conversion element 4 is placed between the solid-state laser element 3 and the mirror 5, and converts the wavelength of light generated from the solid-state laser element 3. For example,
When the solid-state laser element is Nd:YAG, it generates light of 106 μm, which can be converted to light of 0,532 μm by the wavelength conversion element.

[Problem to be solved by the invention]

In this conventional laser diode-pumped solid-state laser with a wavelength conversion element, the wavelength conversion element 4 is placed in a place with high optical density within the laser resonator, which deteriorates the surface of the wavelength conversion element and outputs power in a short time. The disadvantage was that it decreased.

[Means to solve the problem]

The laser diode-pumped solid-state laser of the present invention includes a mechanism that allows the wavelength conversion element to move.

〔Example〕

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a schematic cross-sectional view of one embodiment of the present invention. The optical output from the laser diode 1 is converged on the end face of the solid-state laser element 3 by the converging lens 2, and the excited solid-state laser element 3 is configured to cause population inversion and oscillation between it and the mirror 5. ing. The wavelength conversion element 4 includes a conversion element support 10
It is fixed inside with 1 spring and 9 screws.

The vertical position of the wavelength conversion element 4 can be varied by adjusting the screw 9. The wavelength conversion element 4 is placed in a constricted location in order to increase the density of the light passing through the wavelength conversion element 4, so moving it by about 0.1 mm usually allows light to shine on a new surface of the wavelength conversion element. I can do it. A similar mechanism can also be provided in the horizontal direction. For example, if a 5 mm square element is used as the wavelength conversion element, the life span can be extended several tens of times or more.

FIG. 2 shows a partial sectional view of another embodiment of the invention.

The configuration other than the support structure of the wavelength conversion element 4 is the same as that in FIG. 1.

The wavelength conversion element 4 is held by a screw and a spring 1 via a spacer 14. The spacer 14 is made of Teflon or the like, and has the function of reducing distortion during holding.

〔Effect of the invention〕

As explained above, in a laser diode-pumped solid-state laser having a wavelength conversion element, the present invention makes the wavelength conversion element, which deteriorates the fastest, movable, so that the wavelength conversion element can be effectively utilized, and its lifespan is longer than that of conventional laser diode-pumped solid-state lasers. It has the effect of increasing the amount by several tens of times or more.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of one embodiment of the present invention. FIG. 2 is a partial cross-sectional view of another embodiment of the invention. FIG. 3 is a component diagram of a laser diode-pumped solid-state laser having a conventional wavelength conversion element. 1... Laser diode, 2... Converging lens, 3...
...Solid laser element, 4...Wavelength conversion element, 5...
Mirror, 9... Screw, 10... Conversion element support, 1
1...Spring.

Claims (1)

[Claims] A laser diode, a solid-state laser element that absorbs light from the laser diode and generates other light, a mirror that reflects the light generated from the solid-state laser element, and a wavelength that converts the wavelength of the light from the solid-state laser element. A laser diode-pumped solid-state laser having a conversion element, characterized in that the wavelength conversion element has a movable mechanism.