JPS5989480A - Bi-output solid-state laser device - Google Patents

Abstract

PURPOSE:To miniaturize the device, and to reduce manufacturing cost by efficiently oscillating laser beams from two solid-state rods by using one light source. CONSTITUTION:A metallic reflecting mirror 2 takes a cylindrical shape, a section thereof is formed to a contour shape in the case when two ovals are overlapped on the same plane so as to share one focus, and its inner surface is used as a metallic reflector plate. A cylindrical light source 3 for generating excitation beams is arranged along the common focus. Two laser resonance systems 4, 5 are each disposed along other two focuses, and beams from the light source 3 are projected to the systems and laser beams are emitted. The light source 3 is lit in a pulse shape, and beams from the light source 3 are projected to the solid-state rods 8, 10. Accordingly, the rods 8, 10 generate laser beams, and laser beams are resonated in the resonance systems 4, 5.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a solid-state laser device, and more particularly to a dual-output solid-state laser device that can selectively oscillate two or the same types of laser beams. .

[Technical background of the invention and its problems]

Lasers have traditionally been used to treat birthmarks.

A nevus is a type of mole, and appears colored due to the presence of nevus cells under the skin.

This nevus has different colors that can be seen through the skin surface depending on the location of the nevus cells. Figure 1 (α)
9(b) This will be explained with reference to 9(C). Figure 1 (α).

(h) In t (c>, 21 is the epidermis, 22 is the dermis, 26 is the hair follicle, and 24 is the nevus cell. In FIG. 1 (α), the nevus cell is below the epidermis 21. 24 are present and visible through the skin surface as a brown color. In FIG. 1(A), nevus cells 24 are present in the upper part of the dermis 22.

This image appears transparent as black. In FIG. 1(c), nevus cells 24 are present deep in the dermis 22, and these cells are visible in blue.

Among these, in order to cure the nevus cell 24 shown in FIG.
It is irradiated to some extent. Irradiation with this ruby laser can heal nevus cells without damaging the skin. - Even if a ruby laser is used on the nevus cells 24 shown in FIG. 1(b)tCc>, the nevus cells 24 cannot be cured. This t'L is based on the dissipation length (depth at which 90 cm of the output is absorbed) inherent to the laser beam with respect to the living body. The dissipation lengths of various laser beams for irradiated substances are shown in the table below.

(Margin below) Generally, ruby lasers are relatively well absorbed by living organisms.

Therefore, although the ruby laser is effective against the nevus cells 24 existing in the epidermis 21, it cannot be expected to be effective against the nevus cells 24 existing deep within the skin due to its short dissipation length. Therefore, for the nevus cell 24 shown in FIG. 1(h)t(C), a YAG laser with a long extinction length is used.

In this way, for nevus treatment, two types of lasers are used depending on the location of the nevus cells 24.

The ruby laser and YAG laser form a solid rond of, for example, φ15 x 150 m with ruby and YAG,
The solid iron is instantaneously irradiated with high-output light generated by a Xe lamp or the like, and the energy excites the atoms of the substance constituting the solid iron to generate laser light. The generation time of this laser beam is on the order of μSec or m5ec, and is a so-called pulse oscillation.In order to generate these two types of laser beams, two types of laser generators had to be provided. Therefore, the size of the device has to increase and the cost has inevitably increased.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances L/c, and the first invention is to be able to oscillate two types of laser beams, and to reduce the size and manufacturing cost of the device. The second invention aims to provide a double-blade solid-state laser device that can selectively oscillate laser beams of the 2It class. be.

[Summary of the invention]

The outline of the first invention for achieving the above object is to form a cylindrical shape whose cross-sectional shape is the ring interval when two ellipses are superimposed on the same plane so that the - focal point is common; What is the common focal point VC with a metal reflector whose inner surface is a metal reflector? Ej
A rod-shaped light source for generating excitation light is arranged along the other two focal points, and a beam from the light source for generating excitation light is incident along the other two focal points. - an anti-power solid-state laser device characterized by having two laser resonant systems that emit laser light; This is a reverse output solid-state laser device characterized by adding a shutter means disposed in the middle of the axis.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Figure 2 shows the 1. A schematic perspective view of a reverse power solid-state laser device including the second invention, and FIG. 3 is a sectional view of a metal reflecting mirror. In the second decoy, the counter-power solid-state laser device includes a housing 1, a metal reflecting mirror 2 provided within the housing 1, and a rod-shaped excitation light generation light source 3 disposed within the metal reflecting mirror 2. , two laser resonant systems 4.5 arranged parallel to the excitation light generation source 6, and an original shutter 6.7 movable across the original axes of the laser resonant systems 4 and 5. . The metal reflecting mirror 2
is shown in Figure 3')ttcsTwo ellipses A and B are placed on the same plane with one of the ellipses A and H having a common focal point.
It has a cylindrical shape with a cross-sectional shape corresponding to the ring spacing when f is superimposed, and its inner surface is a metal reflecting plate. The light source 6 for generating excitation light
are, for example, Xe lamps that emit high-output light in a pulsed manner, and are arranged along a common focal point within the metal reflecting mirror 2. Although not shown, the light source 3 for generating excitation light is connected to a power source equipped with a large-capacity capacitor for momentarily supplying a large amount of power and an LC delay circuit that determines the supply time of this power. are doing. The two laser resonant systems 4 and 5 are arranged parallel to the excitation light generating light source 6 along the other focal point of the metal reflecting mirror 2. The laser resonant system 4 is composed of a bar-shaped solid rod 8 disposed within the metal reflecting mirror 2, and reflecting mirrors 9α and 9b disposed facing each other on the long axis extension of the solid rod 8. The reflectance of the reflecting mirror 9α is lower than that of the reflecting mirror 9b.

- The laser resonant system 5 also has the same configuration as the laser resonant system described above, with a bar-shaped solid rod 10 disposed within the metal reflecting mirror 2 and a solid rod 10 disposed opposite to each other on the long axis extension of the solid rod 10. It consists of reflecting mirrors 11α and 11b. Reflector 11α
Its reflectance is lower than that of the reflecting mirror 11b. The metal reflecting mirror 2, the light source 6 for generating excitation light, and the two laser resonant systems 4 and 5 constitute the first invention. The original shutter 6.7 has shafts 6α and 7 that protrude from the housing 1.
One end is rotatably held at α, and the other end is made of a material that does not allow the original to pass through. The original shutter 6 is a solid lot on the optical axis of the laser resonant system 4.

8 and the reflecting mirror 9α so as to be able to move in and out. Further, the original shutter 7 is configured to be able to move in and out between the solid iron 10 and the reflecting mirror 11α on the optical axis of the laser resonant system 5. On the extension of the optical axis of the laser resonant system 4 and outside the self-reflecting mirror 9α, there is a condenser lens 12. An optical fiber 14 is arranged through i3 so as to guide all of the laser light emitted from the laser resonant system 4. Similarly, on the optical axis extension of the laser resonant system 5 and outside the reflecting mirror 11α, there is a condenser lens 15°16
A source fiber 17 is arranged through the laser resonator system 5 to guide the laser light emitted from the laser resonant system 5.

The operation of the dual-output solid-state laser device configured as described above will be explained.

First, when fully operating this dual-output solid-state laser device,
The light source 6 for generating excitation light is turned on in a pulsed manner. Then, as shown in FIG.
．． IOK enters.

At this time, the excitation light generation light source 6 and the solid rod 8 are connected to the third
It is located at the focal point of the ellipse A shown in the figure, and the excitation light generation light source 6 and the solid rod 10 are located at the focal point of the ellipse B. Therefore, the element emitted from the excitation light generation light source 6 is:
When the light is reflected on the part of the metal reflecting mirror 2 belonging to the ellipse A, the light is focused on the solid rod δVc, and when it is reflected on the part belonging to the ellipse B, the light is focused on the solid rod 10. Therefore, the light emitted from the excitation light generation light source 6 can be used as excitation light without wasting it. Solid rod with total incidence of excitation light 8゜1
0 generates a laser beam, and the L laser beam resonates in the laser resonant systems 4 and 5. According to the first rtcb invention, two solid-state laser beams can be oscillated with high total efficiency using one light source. Kira, one of the laser resonance systems 4 and 5 is connected to the shutter 6.
．． 7, laser light can be generated only from the other laser resonant system. For example, if one of the solid-state Rondos 8.10 is used for a ruby laser and the other for a YAG laser, the ruby laser and YAG laser can be selected in one device by switching the shutter 6.7. can be used. The laser beam generated from one side of the laser resonant system 4.5 is directed to a reflecting mirror 9α with low reflectance.
Or take out the n1 element fiber 14 from anti-#J sharp 11α.
Either one of the 17 species can emit a mustard light guide. Therefore, it is convenient when two types of lasers are used depending on the location of the nevus cells, such as in nevus treatment.

It goes without saying that the present invention is not limited to the above embodiments, but includes various modifications within the scope of the invention. For example, a metal reflecting mirror 2t'is whose cross-sectional shape is the ring interval of two overlapping ellipses A and Bf is not limited to one in which each focus is on a straight line as shown in FIG. It may be a cross-sectional shape in which two ellipses A and Bf- are overlapped so that their long axes intersect with each other with a common focal point. Even in this case, the light emitted from the excitation source generation source 3 can be focused onto the solid rod 8.9 without waste. Further, the main switches 6 and 7 disposed in the middle of the optical axes of the laser resonant systems 4 and 5 are not limited to mechanically operated ones as in the above embodiments, but can be made of materials whose transmittance changes depending on an electric field, such as liquid crystals, PLZT, KDP<polarizer), etc. may be used. Further, in the embodiment described above, the laser beams emitted from the laser resonant systems 4 and 5 are of different types, but it is of great value even if the solid rod 8 and the IQi are made of the same material. For example, if the optical fibers 14 and 17 are irradiated with the same laser beam at the same time, they can be cut.

It is convenient for metal processing such as drilling holes. In addition, the present invention
Two or the same types of laser beams are selectively extracted from the laser resonant systems 4 and 5, and the guide of the laser beams emitted from the laser resonant systems 4 and 5 does not matter. Therefore, the laser light emitted from the dual-output solid-state laser device can be used as it is without using an optical fiber <14.17'ft.
Alternatively, light may be guided by combining reflecting mirrors. Furthermore, as shown in FIG. 5, the laser beam from the laser resonant system 4 is reflected by a reflecting mirror 18. An optical fiber 20 is provided in the optical path of the laser beam from the laser resonant system 5 via the half mirror 19.
It can also lead to

〔Effect of the invention〕

As explained above, according to the first invention, it is possible to provide a dual-output solid-state laser device that can efficiently generate two or the same types of laser light in one device, and furthermore, According to the invention, it is possible to provide a dual-output solid-state laser device that can selectively extract two or the same type of laser 'X. Therefore, compared to the conventional method using two devices, the device can be made smaller and the manufacturing cost If can be significantly reduced. In particular, the effect of selectively using two types of laser light in contributing to nevus treatment is extremely significant.

[Brief explanation of the drawing]

FIG. 1 ("> e (b) t (C) is a schematic explanatory diagram illustrating the generation position of nevus cells, and FIG. 2 is a schematic perspective view of a solid-state laser device by Futata, which is an embodiment of the present invention. Figure 6 is a cross-sectional view of a metal reflecting mirror, Figure 4 is a cross-sectional view showing a modified example of the metal reflecting mirror, and Figure W5 is a schematic perspective view of the output light guide path of the dual-output solid-state laser device as a negative optical fiber. 2... Metal reflecting mirror, 6... Light source for generating excitation light, 4
．． 5... Laser resonance system, 6.7... Original shutter, 8.10... Solid rod, 9α, 9b, 11
α, 11, 6. ,,Reflector.

Claims (2)

[Claims] (1) It has a cylindrical shape with the cross-sectional shape of the ring interval when two ellipses are superimposed on the same plane so that the focus of - is common,
A metal reflecting mirror with a metal reflecting plate on its inner surface, a rod-shaped excitation light generating light source arranged along a common focal point, and a bar-shaped excitation light generating light source arranged along the other two focal points, and the excitation light source arranged along the other two focal points. A dual-output solid-state laser device comprising two laser resonant systems that receive light from a light source for light generation and emit laser light. (2) In order to have a common focal point, [form a cylindrical shape with the cross-sectional shape of the ring interval when two ellipses are superimposed on the same plane,
A metal reflecting mirror with a metal reflecting plate on its inner surface, a rod-shaped excitation light generating light source arranged along a common focal point, and a bar-shaped light source for generating excitation light arranged along the other two focal points I/C. The invention also includes two laser resonant systems that emit laser light by receiving light from an excitation source generating light source, and a source shutter means disposed midway along the source axes of the two laser resonant systems. Features dual-output solid-state laser and equipment.