JPH01237602A - Optical fiber for transmission of light energy - Google Patents

Abstract

PURPOSE:To improve mass productivity and to lower the reflection loss of light energy at the end faces of optical fibers by connecting the end faces on the other side of the short-sized optical fibers which are applied with a non- reflection AR coating on the end faces on one side to the end faces of the long-sized optical fiber. CONSTITUTION:The short-sized optical fibers 1, 2 are applied with the AR coating on the end faces 1a, 2a on one side and the end faces 1b, 2b on the other side are welded and connected to both end faces 3a, 3b of the long-sized optical fiber 3. The mass productivity is thereby improved; in addition, the reflection loss of the light energy at the end faces of the optical fibers is decreased. The effect of effectively utilizing the light energy is obtd. and the adverse influence of return light on an incident optical system, particularly a laser oscillator is lessened.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical fiber for optical energy transmission, and in particular, the loss of optical energy due to Fresnel reflection loss at both ends of the optical fiber causes a large loss in terms of performance and cost. This invention relates to high-energy transmission optical fibers for high-power laser processing equipment that produce high-power laser processing equipment.

[Conventional technology]

Conventionally known optical fibers for transmitting optical energy of this kind have used one or several long optical fibers connected together.

[Problem to be solved by the invention]

However, the conventional optical fiber for optical energy transmission described above is long and difficult to handle, and from the standpoint of mass production and cost, it is difficult to
(Non-reflective) No coating applied. For this reason,
The Fresnel reflection loss at both end faces of this optical fiber was as high as about 8%, and there were drawbacks such as loss of transmission energy and return light due to reflection from the incident end face, which adversely affected the optical oscillator.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide an optical fiber for transmitting optical energy that is excellent in mass productivity and that can reduce reflection loss of optical energy at the end face of the optical fiber.

[Means to solve the problem]

In order to achieve the above object, the optical fiber for optical energy transmission according to the present invention is provided by applying AR cocoing to one end surface of a short optical fiber, and applying AR cocoing to the other end surface of the long optical fiber. It is configured to be connected to both end faces.

[Effect]

In this way, in the present invention, an AR cocoon is provided on one end surface.
By connecting a short optical fiber coated with a long optical fiber to a long optical fiber, it is possible to provide a low reflection loss optical energy transmission optical fiber that is excellent in mass productivity and has reduced reflection loss of optical energy at the end face.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 is a front view showing an embodiment of an optical fiber for optical energy transmission according to the present invention. A short optical fiber 1.2 cut into a length of about 10 cm to 1 m has one end face 1.
a, 2a are subjected to AR co-coating, and the other end surfaces 1b, 2b are both end surfaces 3a of a long optical fiber 3,
3b is fusion spliced.

Note that this connection requires reinforcement, which reduces the degree of freedom of bending at this part, but this can be handled by changing the length of the short optical fiber 1.2 depending on the application. . For example, when bending force is applied near the tip of the output side, such as in a laser scalpel, the length of the short optical fiber 1.2 is set to be about 1 m, whereas when used in a laser processing machine that is combined with a robot, If the output end is fixed to a nozzle and a large bending force is applied to the front side of the nozzle, use a short optical fiber 1.2.
This can be done by cutting the length to a short length of about 1Qcm and fitting this connection part into the nozzle.

In addition, as a connection method between the short optical fiber 1.2 and the long optical fiber 3, various methods can be considered in addition to the above-mentioned embodiment method, but a connection method that does not change over time and has a small connection loss That's fine.

〔Effect of the invention〕

As explained above, in the optical energy transmission optical fiber according to the present invention, a short optical fiber whose one end face is AR-coated is connected to both end faces of a long optical fiber. , it is possible to provide an optical fiber for transmitting optical energy with excellent mass productivity, and also to reduce the reflection loss of optical energy at the end face of the optical fiber, which has the effect of effectively utilizing optical energy and also reduces the adverse effects of returned light on the input optical system, especially the laser oscillator. It has various excellent effects such as being able to reduce the amount of

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of an optical fiber for optical energy transmission according to the present invention. L 2.3... Optical fiber, la, 2a... one end face, Ib, 2b... other end face, 3a, 3b... end face.

Claims (1)

[Claims] A light for transmitting optical energy, comprising a short optical fiber having one end face coated with an anti-reflection coating, and the other end face of the optical fiber being connected to both end faces of a long optical fiber. fiber.