JPH0311309A - Light incidence device for optical fiber - Google Patents

Abstract

PURPOSE:To keep the incidence mode to an optical fiber in the steady state by transmitting laser light through a light-transmissive body which is slantingly moved and inserted onto the exit optical path of the laser light, and correctively moving the optical path of the laser light onto the axis of a condenser lens to prevent the deflection of the incidence mode to the optical fiber. CONSTITUTION:A condenser lens 22 is provided on the same axis as the center of an optical fiber end 3 fitted to an optical fiber end holding function part 21, and a light-transmissive body 23 which has one end face part arranged on the axis of the condenser lens 22 and has the other end face part slantingly provided on an exit optical path A of the laser light is arranged between the condenser lens 22 and a laser light exit end part 1. Thus, the laser light is always made incident on the axis of the optical fiber end independently of the installation state of a light incidence device for optical fiber or the exit position precision of the laser light, and the light incidence device for optical fiber of high quality free from deflection of the incidence mode to the optical fiber is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical fiber human light device for inputting laser light into an optical fiber.

[Conventional technology]

In recent years, gas laser oscillators such as helium-neon lasers and argon lasers have come to be widely used in optical measurement equipment and special lighting equipment, and optical fibers are increasingly being used as light guide paths. There is.

Conventionally, in order to input the laser light emitted from a laser oscillator into an optical fiber, an optical fiber end holding function section for holding the end of the optical fiber such as an optical connector is provided at the laser light emitting end of the laser oscillator. A common method is to attach a fiber and let the laser light enter the end of the optical fiber. Furthermore, as a means to improve the incidence efficiency at the end of the optical fiber,
For example, by providing a condensing lens between the above-mentioned laser beam emitting end and the optical fiber end holding function section, and by providing a movable adjustment mechanism for this condensing lens and making it move, convergence adjustment and optical path adjustment can be performed at the same time. The following method is used.

[Problem that the invention seeks to solve]

In the conventional optical fiber human lighting device configured as described above, the optical path of the laser beam output end due to the installation condition and the accuracy of the laser beam output position, the condenser lens and the optical fiber end holding function part The axis misalignment between the central axis of the optical fiber and the central axis of the condensing lens must be corrected by moving the optical axis of the condensing lens, resulting in an axial misalignment between the central axis of the optical fiber end and the central axis of the condensing lens. Since the incident light entering the end of the optical fiber is deviated from the central axis of the end of the optical fiber, the incident mode to the optical fiber is biased, resulting in a very inconvenient situation.

This invention was made to solve the above-mentioned problems, and regardless of the installation condition of the optical fiber human light device or the accuracy of the laser beam emission position, the laser beam is always aligned with the central axis of the end of the optical fiber. It is an object of the present invention to provide a high-quality optical fiber human light device that does not cause bias in the incident mode to the optical fiber because it allows light to enter from above.

[Means for solving problems]

In the optical fiber human light device according to the present invention, a condenser lens is provided coaxially with the central axis of the optical fiber end that fits into the optical fiber end holding function part, and the condenser lens and the laser beam emitting end are connected to each other. In between, a light-transmitting body having one end surface disposed on the central axis of the condensing lens and the other end surface movably provided on the laser light emission path.

[Effect]

In the optical fiber human light device according to the present invention, the optical path of the laser beam is moved onto the central axis of the condensing lens by the laser beam passing through a transparent body tilted and inserted into the laser beam output optical path. After correction, the condensing lens acts to condense and inject the laser beam from on the central axis of the end of the optical fiber.

[Embodiments of the invention]

FIG. 1 is a configuration diagram of an embodiment according to the present invention, in which (1) is a laser beam emitting end of a laser oscillator, (2)
(3) is the optical fiber human light device body installed at the laser beam emitting end (1), and (3) is the optical fiber end to which the optical fiber is attached. (21) is an optical fiber end holding function section provided on the main body (2) and fits and holds the optical fiber end (3), and (22) is an optical fiber end holding function section provided on the main body (2). (23) is a light-transmitting body having parallel flat end surfaces, (24) is a sleeve for holding the light-transmitting body, and (25) is a light-transmitting body (23). )
a ring with a universal joint structure provided with a cross fulcrum to hold one end of the condenser lens (22) in a tiltable manner on the central axis of the condenser lens (22);
(26) is an adjustment screw for tilting and adjusting the other end of the transparent body (23) to the laser beam output optical path (A in the figure).

In the optical fiber human lighting device configured as described above, the main body (2) is installed at the laser beam emitting end (1) due to misalignment or misalignment of the laser beam emitting end. , an axis misalignment occurs between the output optical path of the laser beam and the central axes of the optical fiber holding function section (21) and the condenser lens (22).

Therefore, adjust the rotation of the adjustment screw (26) to
) by tilting and inserting the end of the laser beam emitting end side into the laser beam output optical path, the laser beam entering from the end of the transparent body is refracted according to the refractive index of the transparent body. do. When this refracted Rede light is emitted from the end of the transparent body,
The light is emitted onto the central axis of the condenser lens (22) (B in the figure). The optical fiber end (3) fitted into the optical fiber end holding function part (21) and the condensing lens are arranged on the same axis, and the laser beam approximately parallel to the axis is transmitted to the optical fiber end (3). ) and enters the end of the optical fiber.

Therefore, in the optical fiber human light device according to the present invention, the laser beam can always be incident on the central axis of the condensing lens and the end of the optical fiber disposed coaxially with the condensing lens. Since no deviation occurs, the incident mode entering the optical fiber will not be biased.

〔Effect of the invention〕

As described above, according to the present invention, the misalignment between the output optical path of the laser beam and the center axis of the condensing lens and the end of the optical fiber is corrected, so that the incident mode to the optical fiber is not biased. Since the mode of incidence on the optical fiber can be maintained in a steady state without causing any interference, there is an effect that a high quality human light device for optical fiber can be constructed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an optical fiber human light device according to an embodiment of the present invention. In the figure, (2) is the main body of the optical fiber human light device, (
21) is an optical fiber end holding function part, (22) is a condensing lens, (23) is a transparent body, and (26) is an adjustment screw.

Claims (1)

[Claims] An optical fiber end holder for attaching the optical fiber end to the laser light output end of the laser oscillator in an optical fiber light input device for condensing and inputting the laser light emitted from the laser oscillator to the optical fiber end. A condenser lens is provided on the central axis of the optical fiber end holding function section to condense the laser beam to the end of the optical fiber, and a condenser lens is provided between the condenser lens and the output end of the laser beam. A light-transmitting body having a parallel flat end surface is tiltably provided, and by tilting the light-transmitting body, the light-transmitting body is inserted into the output optical path of the laser beam, and the output optical path is refracted by the light-transmitting body. , to move onto the central axes of the condenser lens and the optical fiber end holding function section, and to correct the axis misalignment between the output optical path of the laser beam and the central axes of the condenser lens and the optical fiber end holding function section. A light input device for an optical fiber, characterized in that: