JP2800503B2 - Diode-pumped solid-state laser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diode-pumped solid-state laser.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional diode-pumped solid-state laser has a laser diode array 1, a condensing lens 15 for condensing light output from the laser diode array 1, and a focal point of the laser diode light. Solid-state laser medium 11, oscillating light HR coat 13, and oscillating light AR, which are respectively deposited on both end surfaces of solid-state laser medium 11.
A coat 17, an output mirror 16, an oscillation light HR13 applied to the output mirror 16, and a laser diode array 1
Around there are a + lead 2, a + electrode 4, a -lead 3, a -electrode 5, a stem 6, a holder 7, and a window 14 for protecting the laser diode array 1. By passing a current through the laser diode array 1 through the + electrode 4 and the − electrode 5, laser diode light is output. This laser light passes through a window 14 for protecting the laser diode array 1 and is condensed by a condenser lens 15.
At the focal point, a solid-state laser medium 11 is arranged, and is excited by diode light. The solid-state laser light is output from the output mirror 16.
Oscillation light of the solid-state laser medium 11 oscillates between the HR coats 13, a part of which is output and output from the output mirror 16.

[0003]

In the conventional diode-pumped solid-state laser, it is difficult to align the optical system with the condenser lens 15 and the beam cross section of the laser diode is elliptical. When narrowing down to the beam diameter at the solid laser medium end face determined by
It was necessary to optimize by moving the condensing lens in parallel along the optical axis.

[0004]

The solid-state laser of the present invention comprises:
A laser diode and a solid-state laser medium excited by the laser diode are provided. Reflective coating is applied to both end faces of the solid-state laser medium facing each other, and a resonator is formed on both end faces .
The solid laser in the opening of the holder
Fix the medium and cover the stem with the holder
Have .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1A is a sectional view of a diode-pumped solid-state laser according to one embodiment of the present invention.

As a light source for excitation of the solid-state laser, the laser diode array 1, the + electrode 4, the + lead 2, the -lead 3, and the -electrode 5 for supplying current to the laser diode array 1, and the laser diode array 1 are mounted. Stem 6 to do
And a holder 7 for accommodating the stem 6. A screw 9 is attached to the stem, and the stem 7 is joined to the holder 7 with an adhesive 8. A solid-state laser medium holder 10 is attached to the screw 9, and a solid-state laser medium 11 is arranged at the center of the solid-state laser medium holder 10. The solid-state laser medium 11 is sealed with a low-melting glass 12,
Block the area around the laser diode array 1 from outside air,
It is filled with an inert gas 18 and sealed. As shown in FIG. 1B, oscillating light and HR coating 13 are applied to both end surfaces of the solid-state laser medium 11.

Next, the operation will be described. The pumping light is output from the laser diode array 1, and the solid-state laser medium 1
Excite one. Since the laser diode array 1 is close to the solid-state laser medium 11 with a dimension of 1 mm or less, it is possible to obtain an excitation power density sufficient for oscillation without narrowing the excitation light by the condenser lens. Not used. In addition, since the end face is provided with the oscillating light HR coat 13, oscillation occurs between the end faces of the solid-state laser medium, and a part is output. Therefore, the number of optical components can be reduced.

FIG. 2 is a sectional view of a diode-pumped solid-state laser according to a second embodiment of the present invention. The laser diode array 1 is connected via a + electrode 4, a + lead 2 and a − lead 3, a − electrode 5, and the laser diode array 1 is mounted on a stem, and the stem 6 is attached to a solid-state laser medium holder 10. The holder 10 and the stem 6 are joined together by the low melting glass 12
Are bonded by a low-melting glass 12, and a solid-state laser medium 11 is disposed in a hole at the center of the holder 10.
To join. As shown in FIG. 1B, an oscillation light HR coat 13 is applied to both end surfaces of the solid-state laser medium 11, and a part thereof is used as an optical output. In addition, an inert gas 13 is filled around the laser diode array 1,
Deterioration due to oxidation etc. is prevented.

The solid-state laser medium 11 is excited by the excitation light of the laser diode array 1. Solid laser medium 1
Oscillation light HR coating 13 is applied to both end faces of 1 so that oscillation occurs on both end faces. Since the diode-pumped solid-state laser of this embodiment uses the low-melting glass 12 for bonding,
There is no degassing, and it is sealed with inert gas 18,
The life of the laser diode array 1 is extended. In the embodiment, the example in which the end face of the solid-state laser medium is flat is shown. However, if one end face has a curvature, the light condensing effect of the emitted light is improved.

[0010]

As described above, according to the present invention, since a resonator is formed at both end surfaces of the solid-state laser medium, a condenser lens, a mirror, and the like are not required, so that the number of parts is reduced and the cost can be reduced. In addition, since sealing is made with low-melting glass, airtight sealing is good, and there is no degassing from the adhesive, so that the life can be extended.
Further, since the inside of the laser diode is sealed with an inert gas, there is no deterioration due to oxidation or the like in the vicinity of the oscillating portion, and the life can be extended.

Although a laser diode array is used as an excitation light source in the embodiment, a single laser diode or light emitting diode may be used instead of the array.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional example.

[Description of Signs] 1 Diode array 2 + Lead wire 3-Lead wire 4 + Electrode 5-Electrode 6 Stem 7 Holder 8 Adhesive material 9 Screw 10 Solid laser medium holder 11 Solid laser medium 12 Low melting point glass 13 Oscillating light HR coat 14 Window 15 Condenser lens 16 Output mirror 17 Oscillating light AR coating 18 Inert gas

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01S 3/094

Claims (4)

(57) [Claims] And 1. A laser diode, a solid-state laser medium excited by said laser diode, said applying mutually opposing end surfaces in the reflective coating of the solid-state laser medium, configured with a diode pumped resonators at both ends faces Solid
Laser diode mounted on stem of body laser
The solid-state laser medium into the opening of the holder with the opening.
A diode-pumped solid-state laser , wherein the holder is fixed to the stem . 2. The diode-pumped solid-state laser according to claim 1, wherein one end face of the solid-state laser medium has a curvature. 3. A diode pumped solid-state laser of claim 1 wherein the diode pumped solid-state laser which is characterized in that a laser diode in an atmosphere of inert gas. 4. The diode-pumped solid-state laser according to claim 1, wherein the distance between the end face of the solid-state laser medium and the laser diode is 1 mm or less.