CN212905744U

CN212905744U - Laser coupling to single mode fiber angle deviation adjusting module applied to automatic machine

Info

Publication number: CN212905744U
Application number: CN202021068142.9U
Authority: CN
Inventors: 马良; 王灵光; 徐爽; 宋斌杰
Original assignee: Intelligent Automation Equipment Zhuhai Co Ltd
Current assignee: Intelligent Automation Equipment Zhuhai Co Ltd; Intelligent Automation Zhuhai Co Ltd
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2021-04-06
Anticipated expiration: 2030-06-11

Abstract

The utility model discloses a be applied to laser coupling to single mode fiber angle deviation adjustment module of automatic board aims at providing a simple structure, coupling efficiency height and be suitable for the laser source of multiple angle of divergence's the laser coupling to the single mode fiber angle deviation adjustment module of being applied to automatic board. The utility model discloses a camera module, first support frame and light source position control platform, be provided with laser light source on the light source position control platform, be provided with ground glass on the first support frame, ground glass is located the camera module reaches between the laser light source, the camera module ground glass reaches the coaxial setting of laser light source. The utility model discloses be applied to laser coupling's technical field.

Description

Laser coupling to single mode fiber angle deviation adjusting module applied to automatic machine

Technical Field

The utility model relates to a be applied to laser coupling to single mode fiber angle deviation adjustment module of automatic board.

Background

Laser is a significant invention of human in the 20 th century since nuclear power, computers, and semiconductors, and is called "fastest knife", "best-line ruler", and "brightest light". Laser, i.e., the light emitted by atomic stimulated emission, has been discovered by the famous jewish physicist einstein as early as 1916. When the electrons in the atoms absorb energy and then jump from a low energy level to a high energy level and then fall back from the high energy level to the low energy level, the released energy is released in the form of photons, and the optical characteristics of the excited photon beams are highly consistent. Because of such advantages of laser, it is applied to various fields such as manufacturing, life, military, medical treatment, communication, measurement, etc., and related industries are well established, and systems thereof are classified into continuous wave lasers and pulse lasers.

The optical fiber is a short term optical fiber, and is a fiber made of glass or plastic, which is often used as a transmission tool of light, and the principle of the fiber is total reflection of light. Optical fibers are used as carriers for transmitting optical signals and are key materials in optical fiber communication. The general optical fiber has mainly three layers: the core is a glass core with high refractive index, the middle is a silica glass cladding with low refractive index, and the outermost is a resin coating for protection. Two main characteristics of optical fibers are loss and dispersion. The loss is attenuation or loss of an optical signal per unit length, and the larger the loss is, the shorter the transmission distance is, in relation to the transmission distance of the optical signal. The main causes of attenuation loss of optical fiber are: inherent losses, bending, extrusion, impurities, non-uniformity, butt-joints, etc. The transmission modes of light in the optical fiber can be classified into: single mode optical fibers and multimode optical fibers. Multimode fiber: the central glass core is relatively thick (50 or 62.5 μm) and can transmit light in multiple modes. However, the intermodal dispersion is large, which limits the frequency of the transmitted digital signal and is more severe with increasing distance. For example: a600 MB/KM fiber has a bandwidth of only 300MB at 2 KM. Thus, multimode fibers are relatively close in transmission distance, typically only a few kilometers. Single-mode fiber: the central glass core is very thin (core diameter is typically 9 or 10 μm) and can only transmit one mode of light. Therefore, the dispersion between the modes is very small, and the optical fiber is suitable for remote communication, and because the single-mode optical fiber has good optical transmission characteristics and most optical devices are based on the single-mode optical fiber, more and more scenes are used for the single-mode optical fiber.

Optical fiber devices have important applications in free space optical communications, where coupling spatially light transmitted over long distances into single mode optical fibers is a precision project. In practical applications, one of the most critical steps in coupling free space light emitted from a laser into an optical fiber is the coupling efficiency, which determines the amount of energy at the output end of the optical fiber.

During coupling, the following points are to be taken into account to ensure that the laser light emitted by the laser enters the fiber completely. First, after the laser beam is focused by the lens, the beam waist spot radius must be smaller than the radius of the fiber core of the optical fiber, and the beam divergence angle must be smaller than the numerical aperture of the optical fiber. The emphasis is on choosing a reasonable lens focal length. Of course, for single mode fibers, the spherical aberration correction of the lens should also be noted because the core radius is too small. In addition, the clear aperture of the lens is at least about one time larger than the beam diameter to reduce diffraction losses. Secondly, the focused beam waist spot should fall on the end face of the optical fiber, and the incident laser beam, the lens and the optical fiber should be coaxial. This is done mainly on the alignment jig and is preferably adjusted by a reference light. Third, reflection, diffraction and scattering losses of the laser beam on the lens and reflection, scattering and absorption losses on the fiber end face are reduced as much as possible. The reflection and scattering loss of the lens can be reduced by plating an antireflection film and keeping the lens clean; the fiber end face is highly polished and cleaned, which reduces fiber end loss.

When the laser is coupled into the optical fiber, even if the positions of the reference spot and the coupling spot are completely overlapped, the final laser may have low coupling efficiency or cannot be coupled into the optical fiber because the incident angle of the optical fiber is larger than the Numerical Aperture (NA) of the single-mode optical fiber, as observed from the image taken by the industrial camera. This is because, as shown in fig. 1, the deviation between the exit angle of the end face of the optical fiber and the incident angle of the coupled light is large. At this time, the coupled light is ensured to be incident at an angle parallel to the axis of the optical fiber, and finally, the coupled light enters the light, so that the coupling efficiency is improved.

The current conventional methods for horizontal collimation of light are mainly using one or two diaphragms.

Method 1-with one diaphragm: put the diaphragm on the slide rail, let light pass through the diaphragm hole, the center of facula is on a straight line with diaphragm hole center, at this moment backward the position of removal diaphragm, if optical axis and removal axle are nonparallel, light just can not pass through the diaphragm hole and is blocked by the aperture diaphragm, at this moment the angle of adjusting the light source makes the facula pass through the diaphragm, continue to move the diaphragm position backward and then the preceding step until no matter how to move the diaphragm backward, light all can pass through the aperture of diaphragm, accomplish light level adjustment this moment promptly. Although the method is simple and convenient, the precision is in direct proportion to the distance, the farther the distance is, the higher the precision is, obviously, the space of an automatic machine is limited, the precision cannot be ensured, and the method is also relatively complicated when applied to automation; method 2-two diaphragms are used: when two diaphragms are used, the two diaphragms are separated and fixed at a certain distance, the centers of the diaphragm holes are on the same height and the same straight line, and light rays cannot necessarily pass through the second diaphragm hole if not horizontal when passing through the first diaphragm hole, so that the height and the angle of the light source are adjusted until the light rays pass through the two diaphragm holes simultaneously, and the light rays are horizontal. The method does not need to move the diaphragm, saves the precision problem caused by small space, is more troublesome to adjust, needs to adjust three dimensions simultaneously, also needs to ensure the height problem of two diaphragm holes, and is not beneficial to the automation of the machine table. Therefore, there is a need to develop an angle deviation adjustment module for coupling laser applied to an automated machine to a single mode fiber, which has a simple structure, high coupling efficiency and is suitable for laser sources with various divergence angles.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough, provide a simple structure, coupling efficiency height and be suitable for the laser source of multiple divergence angle be applied to the laser coupling to the single mode fiber angle deviation adjustment module of automatic board.

The utility model adopts the technical proposal that: the utility model discloses a camera module, first support frame and light source position control platform, be provided with laser light source on the light source position control platform, be provided with ground glass on the first support frame, ground glass is located the camera module reaches between the laser light source, the camera module ground glass reaches the coaxial setting of laser light source.

Further, the camera module comprises a second support frame, a camera is arranged on the second support frame, a lens is arranged on the camera in a matched mode, and the lens is matched with the laser light source.

Furthermore, one side of the ground glass, which is close to the laser light source, is a polished surface, and one side of the ground glass, which is close to the camera module, is a frosted surface.

Further, the wavelength of the laser light source is 850 nm.

Further, the lens is an industrial lens.

Further, the focal length of the lens is 75 mm.

Further, the camera is an industrial camera.

Further, the light source position adjusting platform is a five-axis adjusting platform.

The utility model has the advantages that: compared with the prior art, in the embodiment of the utility model, use ground glass replaces the diaphragm, utilizes the refraction principle of light, as long as ensure to add the facula center around the ground glass can together, this kind of setting need not to consider the high problem of light source, as long as guarantee light beat can on the ground glass camera module observe can to the distance does not have the influence to the precision almost, only needs very little space just can accomplish, accords with the requirement of automatic board completely, because the camera module focuses and observes being the facula of expansion on ground glass, also is favorable to the location, the utility model discloses easy and simple to handle, simple structure, it is small, coupling efficiency is high, is suitable for the laser light source of multiple divergence angle, can be used to the horizontal autocollimator equipment of supplementary laser coupling, so, the utility model has the advantages of simple structure, High coupling efficiency and suitability for laser sources with various divergence angles.

Drawings

FIG. 1 is a schematic illustration of prior art laser coupling;

fig. 2 is a schematic plan view of the present invention;

FIG. 3 is a schematic view of the present invention in an ideal state with the ground glass removed;

FIG. 4 is a schematic view of the present invention at an ideal state and at another viewing angle when the ground glass is removed;

FIG. 5 is a schematic view of the light spot of the present invention in an ideal state and with the ground glass removed;

FIG. 6 is a schematic view of the present invention in an ideal state without the ground glass removed;

FIG. 7 is a schematic view of another perspective of the present invention in an ideal state without the ground glass removed;

FIG. 8 is a schematic view of the light spot of the present invention in an ideal state without removing the ground glass;

FIG. 9 is a schematic view of the present invention in a normal condition and with ground glass removed;

FIG. 10 is a schematic view of the present invention at another viewing angle under normal conditions and with ground glass removed;

FIG. 11 is a schematic view of the light spot of the present invention under normal conditions and with the ground glass removed;

FIG. 12 is a schematic view of the present invention during adjustment without the ground glass removed;

FIG. 13 is a schematic view of another perspective of the present invention during adjustment and without removing the ground glass;

FIG. 14 is a schematic view of the light spot during adjustment and without removing the ground glass;

fig. 15 is a schematic view of the present invention when adjusting the pitch angle of the laser light source;

fig. 16 is a speckle pattern when the pitch angle of the laser light source is adjusted according to the present invention;

fig. 17 is a light spot diagram of another view angle when the pitch angle of the laser light source is adjusted according to the present invention;

fig. 18 is a schematic view of the present invention when adjusting the deflection angle of the laser light source;

fig. 19 is a speckle pattern when the present invention adjusts the deflection angle of the laser light source;

fig. 20 is a spot diagram of another view angle when the present invention adjusts the deflection angle of the laser light source.

Detailed Description

As shown in fig. 2, in this embodiment, the utility model discloses a camera module 1, first support frame 2 and light source position control platform 3, be provided with laser light source 4 on the light source position control platform 3, be provided with ground glass 5 on the first support frame 2, ground glass 5 is located camera module 1 reaches between the laser light source 4, camera module 1 ground glass 5 reaches the coaxial setting of laser light source 4. Compared with the defects of the prior art, in the embodiment of the present invention, during horizontal collimation, in an ideal state, the laser of the laser source 4 horizontally enters the camera module 1, in this process, the laser enters the ground glass 5, so that the laser is homogenized and scattered, the central position of the laser spot before and after passing through the ground glass is known to be unchanged according to the law of refraction, and the laser belongs to coaxial light, whether the laser is horizontal to a working surface can be judged by applying the principle, because the laser source 4 emits at a tiny inclination angle under a general condition, so that the laser spot is not at the central position of the camera module 1, the pitching angle of the laser source 4 is further adjusted by the light source position adjusting platform 3, so that the light spot before and after passing through the ground glass is on the same horizontal line, and the yaw angle of the laser source 4 is further adjusted by the light source position adjusting platform 3, make light all on same vertical line through the facula center around the ground glass to make light coincide together through the center of the facula around the ground glass, light reaches horizontal effect promptly, the utility model discloses utilize light vertical incidence ground glass to produce the coaxial light and carry out the horizontal collimation of light and rectify, can convenient and fast go into optic fibre with the horizontal coupling of laser, make the utility model has the advantages of simple structure, coupling efficiency height and be suitable for the multiple laser light source who disperses the angle.

In this embodiment, the camera module 1 includes a second support frame 6, a camera 7 is disposed on the second support frame 6, a lens 8 is disposed on the camera 7 in a matching manner, and the lens 8 is matched with the laser light source 4.

In this embodiment, one surface of the ground glass 5 close to the laser light source 4 is a smooth surface, and one surface close to the camera module 1 is a frosted surface.

In the present embodiment, the wavelength of the laser light source 4 is 850 nm.

In this embodiment, the lens 8 is an industrial lens.

In this embodiment, the focal length of the lens 8 is 75 mm.

In the present embodiment, the camera 7 is an industrial camera.

In this embodiment, the light source position adjusting platform 3 is a five-axis adjusting platform.

The utility model discloses a theory of use as follows:

in an ideal state, the laser of the laser light source 4 horizontally enters the camera module 1, as shown in fig. 3 to 5, the ground glass 5 is removed, and the laser in an initial state is horizontally just enters the center of the camera module 1;

the ground glass 5 is placed on the first support frame 2, as shown in fig. 6 to 8, laser spots are homogenized and scattered, the light path and the light spots in the camera module 1 can know that the central positions of the front and rear light spots of the laser passing through the ground glass 5 are unchanged according to the law of refraction and belong to coaxial light, and whether the laser is horizontal to a working surface can be judged by applying the principle;

as shown in fig. 9 to 11, the ground glass 5 is removed first, and since the laser source 4 emits light at a slight inclination angle under normal conditions, so that the laser spot is not located at the center of the camera module 1, and the light and the optical fiber need to be coaxially incident in consideration of the problem of loss of the optical fiber, the setting can be used to adjust and determine whether the light is horizontal;

during adjustment, as shown in fig. 12 to 14, the ground glass 5 is first placed on the first support frame 2; as shown in fig. 15 to 17, the elevation angle of the laser light source 4 is adjusted by the light source position adjusting platform 3, so that the light spot centers before and after the light passes through the ground glass are all on the same horizontal line; as shown in fig. 18 to 20, the light source position adjusting platform 3 further adjusts the deflection angle of the laser light source 4, so that the centers of the light spots before and after the light passes through the ground glass are all on the same vertical line, and the centers of the light spots before and after the light passes through the ground glass are overlapped together, that is, the light achieves the horizontal effect.

While the embodiments of the present invention have been described in terms of practical embodiments, they are not intended to limit the scope of the invention, and modifications of the embodiments and combinations with other embodiments will be apparent to those skilled in the art in light of the present description.

Claims

1. The utility model provides a be applied to laser coupling of automatic board to single mode fiber angle deviation adjustment module which characterized in that: it includes camera module (1), first support frame (2) and light source position control platform (3), be provided with laser light source (4) on light source position control platform (3), be provided with ground glass (5) on first support frame (2), ground glass (5) are located camera module (1) reaches between laser light source (4), camera module (1) ground glass (5) reach laser light source (4) coaxial setting.

2. The module of claim 1, wherein the module comprises: the camera module (1) comprises a second support frame (6), a camera (7) is arranged on the second support frame (6), a lens (8) is arranged on the camera (7) in a matched mode, and the lens (8) is matched with the laser light source (4).

3. The module of claim 1, wherein the module comprises: one side of the ground glass (5) close to the laser light source (4) is a polished surface, and the other side of the ground glass close to the camera module (1) is a frosted surface.

4. The module of claim 1, wherein the module comprises: the wavelength of the laser light source (4) is 850 nm.

5. The module of claim 2, wherein the module is adapted to adjust the angular deviation of the single-mode fiber from the laser coupling mode, and comprises: the lens (8) is an industrial lens.

6. The module of claim 2, wherein the module is adapted to adjust the angular deviation of the single-mode fiber from the laser coupling mode, and comprises: the focal length of the lens (8) is 75 mm.

7. The module of claim 2, wherein the module is adapted to adjust the angular deviation of the single-mode fiber from the laser coupling mode, and comprises: the camera (7) is an industrial camera.

8. The module of claim 1, wherein the module comprises: the light source position adjusting platform (3) is a five-axis adjusting platform.