JPS61134088A - Total reflection type prism amplifier - Google Patents

Abstract

PURPOSE:To unnecessitate coating treatment on the reflection plane by a method wherein total reflection is performed on the reflection plane by making an inclination between the incidence plane and the reflection plane and between the emission plane and the reflection plane. CONSTITUTION:With respect to a laser medium 1, an excitation lamp 2, an incidence plane 3, an emission plane 4, and a reflection plane 5; thetain is the angle of incidence, thetaout the angle of refraction, alpha the angle made between the incidence plane and the reflection plane and between the emission plane and the reflection plane, n2 the refractive index of the laser medium 1, n1 and n2 the refractive indices of the substance in contact with the laser medium, and broken lines the region of laser beam advancement. A laser beam comes into the incidence plane 3 at the angle of thetain and comes into total reflection on the reflection plane 5 when satisfying Formula 1. For example, in the case of a laser medium of n1=n3=1, n2=1.52, alpha=26.65 deg., when made incident at thetain=56.65 deg., a laser beam is reflected on the reflection plane 5 at a reflection angle of 60 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solid-state laser device, and particularly to a laser optical amplifier device.

[Conventional technology]

In a conventional reflection amplifier of this type, as shown in Figure 2, the incident surface 3 and the reflection surface 5 of the laser medium 1 are parallel, and the seventh reflection surface reflects the laser light and transmits the excitation light. [Problems to be Solved by the Invention] As mentioned above, in the conventional reflection type amplifier device, when the reflective surface is subjected to the coating process, the incident energy is not absorbed by the coating process. Limited by damage threshold.

[Means to solve all problems]

In the present invention, the incident surface and the reflecting surface and the exit surface and the reflecting surface are tilted so that the light is totally reflected by the reflecting surface, thereby eliminating the need for coating treatment on the reflecting surface.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing the configuration of a total reflection type disk amplifier device according to the present invention.

In the figure, 1 is the laser medium, 2 is the excitation lamp, 3 is the incident surface, 4 is the exit surface, 5 is the reflective surface, θin is the incident angle, θ
is the refraction angle, α is the angle between the incident surface and the reflective surface ut, and the exit surface and the reflective surface, nl [refractive index of laser medium 1, nle n is the refractive index of the substance in contact with the laser medium, broken liJ ha laser This is the area where light travels.

The laser beam is incident on the incident surface 3 at an angle θin, and when the following conditional expression is satisfied, the laser beam is totally reflected at the reflective surface 5.

5in(θout+α)>ns/ns where sin θin/sin θout =”
t/nt For example, n1=n3=1. n2 = 1.5
2. When the laser medium is α=26.65′, θi X1
When laser light is incident at an angle of =56.65', it is reflected by the reflective surface 5 at a reflection angle of 60°.

〔Effect of the invention〕

As explained above, the present invention has the advantage of tilting the incident surface and the reflecting surface and the output surface and the reflecting surface so that the laser beam is totally reflected by the totally reflecting surface, and completely eliminates the need for coating on the reflecting surface.
It is possible to input laser light with high energy density. In addition, by using the total reflection prism intensifier of the present invention, it is possible to construct a large-diameter, high-output laser device.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention. Figure 2 is a conventional reflection amplifier! ! FIG. The broken line is the area in which the laser beam travels. 1...Laser medium, 2...Excitation lamp, 3...Incidence surface, 4...Emission surface, 5...
...Reflecting surface, θin...Laser light incident angle, θ
out... Laser beam refraction angle, α... Angle s"M... between the incident surface and the reflective surface, and the output surface and the reflective surface.
...Refractive index of the laser medium, "1 e"3...
...Refractive index of the substance in contact with the laser medium.

Claims (1)

[Claims] 1. A total reflection prism amplifier device, characterized in that an incident surface, an exit surface, and a reflecting surface of a laser medium are inclined, and the incident laser beam is totally reflected and amplified by the reflecting surface.