JPS58145901A - Fiber for laser knife - Google Patents

Abstract

PURPOSE:To improve the transmittance of a laser beam remarkably by forming a fiber which has a cord-like structure of a rectangular shape in section and of which the long sides of the rectangular shape are longer by at least >=5 times than the shorter sides and transmitting the linearly polarized laser beam therethrough. CONSTITUTION:A fiber for a laser knife is formed to have the section of which the long sides (a) are longer by at least >=5 times, more preferably >=10 times, than the shorter sides (b). A linearly polarized laser beam is used. The linearly polarized laser beam A made incident to the fiber from the incident end 1 thereof repeats total reflection between the upper bottom 2 and lower bottom 3 of the fiber and is emitted from an exit end 4. Then, the transmittance of the linearly polarized light is improved in the transmission of said beam.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for use as a light guide path of a laser scalpel. This article relates to the structure of optical fibers.

Conventional laser beam refracts and focuses the laser beam using mirrors and lens groups.
This is a joint type laser scalpel that emits light from the tip of the laser knife, but in this method, the entire device is rigid and has poor operability.In order to improve this, various laser scalpel devices that use optical fibers have been studied. , some of which have come into practical use.

However, conventional optical fibers have generally been circular in cross section, but these are relatively flexible and easy to manufacture using extrusion methods. Furthermore, the light transmittance was said to be relatively good.

However, when transmitting a laser beam through the fiber, unlike the case of beams used for ordinary optical communications, the transmission loss must be specially reduced, and a higher transmittance must be achieved. And so. That is, since the laser beam is more like a heat ray than a light ray, the loss when passing through the fiber immediately melts and burns the fiber itself, causing the fiber to quickly melt and burn out. Many of them lost their functionality and became unpractical. This is a highly heat-resistant lees as a countermeasure.

Various studies have been conducted to use materials with
The current situation was that sufficient information had not yet been obtained.

As a result of various studies on fibers for laser scalpels formed from Kcl, KBy, AgCl%, and other known 7-eye materials, the inventor has recently discovered that the cross section is rectangular. A linearly polarized laser beam is limited to a rectangular belt-shaped fiber whose long side is at least 5 times or more preferably 10 times as long as its short side and whose overall shape is flat. If the transmittance is transmitted through the phi/? - It was discovered that this was much higher than that of 1, which led to the completion of the present invention.

Embodiments will be described below with reference to the drawings.

The drawing shows the laser scalpel phi/? according to the present invention. - is a perspective view of. Its cross section is rectangular, and it is formed of a solid having a string-like structure. The important features of the product of this invention are:
The long side a of the rectangle is at least 5 times as long as the short side, preferably 10 times as long as the short side.

In particular, in the product of the present invention, a linearly polarized laser beam A is used, and the linearly polarized laser beam A entering from the input end 1 of the fiber has an upper base 2 and a lower base of the fiber optics. As a result of the experiment, in the case of a)5b, the transmittance is low and there is no difference from that of the conventional fiber with a circular cross section, but in the case of a)5b, the transmittance increases rapidly, and the transmittance is significantly lower than that of a)1.
At 0b, there is a significant improvement. In the prototype, a = 7■
, b=0.6-, a linearly polarized laser beam was applied and the transmittance was 92%.

On the other hand, in the case of circular fibers having the same area, the cross section was less than 50 inches, and there was a clear difference between the two.

In addition, the material is KcerK, which is the same as conventional fiber.
Br * kgcl + TlBr, Tl1l
+ Zn5e e As2Se, or a mixture of two or more of these are all applicable.

The present invention is based on the above-mentioned structure, and its transmittance is particularly excellent when transmitting a linearly polarized laser beam, and it is also superior to conventional products no matter what material is used on the machined surface. There is no inferiority, and furthermore, other properties such as flexibility and operability are also almost the same, making it particularly useful as a fiber for laser scalpels.

Claims (2)

[Claims] (1) A fiber formed of a solid having a rectangular cross section and a string-like structure, the long side of the rectangle being at least 5 times longer than the short side, and linearly polarized. A fiber for Shi7 laser scalpel that is characterized by allowing laser beams to pass through it. (2) The fiber for laser scalpel according to claim 1, wherein the long side is about 711I11 and the short side is about 0.6cm.