CN212695444U - Flexible coupling device of laser - Google Patents

Abstract

The utility model discloses a flexible coupling device of laser instrument in the fiber laser coupling field, including laser diode, motor, computer and pass laser tube shell lateral wall and set up the optic fibre between upper pressure head crowd and lower pressure head crowd, optic fibre and laser tube shell contact have the gilding layer that supplies laser fusion welding, the light beam that laser diode launches enters into optic fibre, optic fibre collects the optical signal and sends to the computer; the upper pressure head group comprises a plurality of flexible pressure columns of which the telescopic length is controlled by a motor, and the bottom ends of the flexible pressure columns and the upper ends of the lower pressure head group form a groove for limiting the optical fiber; the flexible compression columns are provided with force feedback devices, and the computer controls the telescopic length of each flexible compression column through the motor. The utility model discloses can realize the high accurate angular adjustment of optic fibre, avoid single clamping position to influence the output peak value of coupling power, improve the precision and the efficiency that laser instrument optic fibre was counterpointed, avoid welding the problem that back skew and bonding strength are not high, improve optic fibre unable adjustment base's stability.

Description

Flexible coupling device of laser

Technical Field

The utility model relates to an optic fibre laser coupling field specifically is a flexible coupling device of laser instrument.

Background

The laser is the most basic and most core device in the current optical communication complete machine system, and the quality of the laser directly influences the quality of optical waveguide transmission and optical modulation and the subsequent signal collection processing capacity. The semiconductor laser is the most widely used laser source transmitter at present, wherein the military communication laser is mostly in a butterfly packaging structure and mainly comprises a laser diode, a lens, an optical fiber, a ceramic substrate, a TEC thermoelectric refrigerator and a metal shell, and the most central problem in the manufacturing process is how to ensure the device mounting and optical fiber coupling precision.

Fiber coupling falls into two broad categories, active and passive. The active mode is that the real-time alignment of the optical fiber is carried out under the working condition of the laser, and the receiving end (the optical fiber) needs to be quickly and accurately coupled to the maximum power point of the emergent light field of the transmitting end (the semiconductor laser chip); the other is passive alignment, i.e. in case of non-operation of the laser, the alignment coupling is done only by the alignment marks of the laser and the V-grooves defining the fiber positions when packaged.

The active coupling is generally adopted under the condition that the coupling efficiency requirement is high, the active coupling is divided into manual positioning and automatic machine positioning, the manual positioning needs an experienced operator to operate on a precise displacement sliding table, the efficiency is extremely low, the yield is not high, and the active coupling is not generally adopted. The automatic positioning of the machine needs to connect the alignment platforms of XYZ and roll axes in series, the equipment installation is complex, cross coupling influence of different degrees of freedom exists between the axes, the misalignment of the rotation center of the alignment platform and the tail end of the optical fiber can cause the new deviation of linear direction brought by angle adjustment, the possible maximum point of optical power needs to be found out through multiple times of fine adjustment, and the requirement on the repeated positioning of clamping is high. And the functional part of the laser diode after coupling alignment needs to keep the position relation with the fiber core of the optical fiber, the ultraviolet curing glue or the laser spot welding mode is mostly adopted in the industry for fixing, the glue is easy to expand and age by heating in the service process, the laser spot welding needs to design a special customized clamp, different optical fiber structures need to be manufactured with corresponding clamps for realization, the adaptability is poor, and the problem of the deviation after welding caused by welding nonuniformity is always a difficult point in the industry.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flexible coupling device of laser instrument to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a flexible coupling device of a laser comprises a laser diode, a motor, a computer and an optical fiber penetrating through the side wall of a laser tube shell and arranged between an upper pressure head group and a lower pressure head group, wherein a gold-plated layer for laser fusion welding is arranged at the contact position of the optical fiber and the laser tube shell, a light beam emitted by the laser diode enters the optical fiber, and the optical fiber collects an optical signal and sends the optical signal to the computer; the upper pressure head group comprises a plurality of flexible pressure columns of which the telescopic length is controlled by a motor, and the bottom ends of the flexible pressure columns and the upper end of the lower pressure head group form a groove for limiting the optical fiber; and the flexible compression leg is provided with a force feedback device, and the force feedback device and the motor are connected with a computer.

As a development of the present invention, the bottom end of the flexible compression leg has an elastic medium with a smooth surface contacting with the optical fiber.

As the improved scheme of the utility model, the pressure head crowd includes a plurality of support columns with flexible compression leg bottom one-to-one down, the tip of support column is elastic contact or has the rigid contact of ball.

As the improved scheme of the utility model, the groove is a V-shaped groove.

As the utility model discloses an improvement scheme, be fixed with TEC thermoelectric refrigeration ware, heat sink base and AIN film base plate in proper order on the interior bottom surface of laser instrument tube from the bottom up, laser diode fixes on the AIN film base plate.

As the improved scheme of the utility model, the light beam of laser diode transmission assembles into a branch and enters into behind collimating lens and the focusing lens in proper order in the optic fibre.

Has the advantages that: the utility model discloses a position that multi-point flexible compression leg realized optic fibre trades more, multi freedom's coupling realizes optic fibre and light-emitting function device laser diode's high-accuracy coupling, can realize high-accuracy angle modulation, avoid single clamping position to influence the output peak value of coupling power, the precision and the efficiency of laser instrument optic fibre counterpoint have been improved, the filling process through adopting laser fusion welding replaces traditional spot welding and the fixed mode of ultraviolet curing glue, the skew and the not high problem of bonding strength after having avoided welding, optical fiber unable adjustment base's stability has been improved.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a top view of the structure of the present invention;

fig. 3 is a schematic diagram of the connection between the optical fiber and the lower pressure head group according to the present invention.

In the figure: 1-a laser diode; 2-AIN thin film substrate; 3-heat sink base; 4-TEC thermoelectric refrigerator; 5-laser tube shell; 6-a collimating lens; 7-a focusing lens; 8, a motor; 9-upper pressure head group; 10-solder; 11-gold plating; 12-a hold down head cluster; 13-optical fiber.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, a flexible coupling device for a laser, comprising a laser diode 1, a motor 8, a computer and an optical fiber 13 passing through the side wall of a laser tube 5 and arranged between an upper pressure head group 9 and a lower pressure head group 12, wherein a gold-plated layer 11 for laser fusion welding is arranged at the contact position of the optical fiber 13 and the laser tube 5, a light beam emitted by the laser diode 1 enters the optical fiber 13, and the optical fiber 13 collects an optical signal and transmits the optical signal to the computer; the upper pressure head group 9 comprises a plurality of flexible pressure columns of which the telescopic length is controlled by a motor 8, and the bottom ends of the flexible pressure columns and the upper ends of the lower pressure head group 12 form a groove for limiting the optical fibers 13; the flexible compression columns are provided with force feedback devices, and the computer controls the telescopic length of each flexible compression column through the motor 8 by combining optical signals and detection signals of the force feedback devices.

The Gaussian beams output by the laser diode 1 form converged beams through the collimating lens 6 and the focusing lens 7, the computer is electrified by the motor 8 to control the height difference change of the flexible pressing columns in the upper pressing head group 9, so that the upper pressing head group 9 is fed and moved to a certain height at the same speed, and a fixed vertical interval is formed by matching with the supporting columns in the lower pressing head group 12 to form a large-range searching range, so that the beams enter the optical fiber 13. After the optical signals collected by the optical fibers 13 are processed by a computer, the optical signals serve as the basis of action commands loaded to the motor 8, the motor 8 controls the flexible compression columns to feed at different speeds, different distances are formed between the flexible compression columns and the support columns, the positions of the optical fibers 13 are finely adjusted in the distances, and the six-dimensional and angle directions of the optical fibers 13 can be adjusted in the process.

When the computer calculates the coupling power to reach the peak value according to the received optical signal, the optical fiber 13 is fixed by a groove formed by the upper pressure head group 9 and the lower pressure head group 12, the groove is preferably a V-shaped groove, then the welding material 10 is welded by adopting a welding mode, and preferably a non-contact laser brazing system is adopted to weld the gold plating layer 11 at the contact part of the optical fiber 13 and the laser tube shell 5, so that the coupling and fixing process is completed.

Specifically, the optical fiber coupling operation steps are as follows:

1) placing the optical fiber: the optical fiber 13 is inserted into the laser tube housing 5 to be coupled, as shown in fig. 3, the position of the optical fiber 13 is fixed by the positioning groove of the lower support column each time, the output end of the optical fiber 13 is connected to the computer, and the upper pressure head group 9 is controlled by the motor 8 to move downwards to contact the optical fiber 13.

2) Coarse coupling: the motor 8 controls the change of the distance between the upper pressure head group 9 and the lower pressure head group 12, the distance surface forms a groove, the position of the optical fiber in the three-dimensional direction is controlled, a large-range search space is formed, light beams enter the optical fiber 13, and the synchronous feeding speed of the upper pressure head group 9 controlled by the motor 8 can be 10-15 mm/s. Preferably, the pressing force may be 50N when the upper and lower indenter groups 9 and 12 move in contact with the optical fiber.

3) Fine coupling: according to the optical signal captured by the optical fiber, the computer calculates a displacement signal, and the motor 8 controls the stretching amount of each flexible compression leg, so that the upper compression head group 9 forms an instant deflection surface, and the deviation of the deflection angle direction of the optical fiber is corrected. Preferably, when the upper pressure head group 9 controls the optical fiber to perform angle transformation, the moment feedback of the force feedback device can be 5-10N/m.

4) Fixing: and when the coupling light output power reaches the peak value, a non-contact laser brazing system is adopted for automatic wire filling and laser melting, the gold-plated optical fiber is coated with solder, and silicon rubber is filled after the welding is finished, so that the whole outer surface of the laser tube shell 5 is flat. Preferably, the light extraction power of the laser brazing system can be 25W, and X-ray inspection is required after welding is completed.

Preferably, the bottom end of the flexible compression leg has a surface finish of an elastomeric medium in contact with the optical fiber 13. The end of the supporting column in the lower pressure head group 12 is an elastic contact or a rigid contact with a ball, so that the optical fiber 13 can be conveniently contacted without being damaged.

Preferably, a TEC thermoelectric refrigerator 4, a heat sink base 3, and an AIN film substrate 2 are sequentially fixed on the inner bottom surface of the laser case 5 from bottom to top, and the laser diode 1 is fixed on the AIN film substrate 2.

The utility model discloses a position that multi-point flexible compression leg realized optic fibre trades more, multi freedom's coupling realizes optic fibre and light-emitting function device laser diode's high-accuracy coupling, can realize high-accuracy angle modulation, avoid single clamping position to influence the output peak value of coupling power, the precision and the efficiency of laser instrument optic fibre counterpoint have been improved, the filling process through adopting laser fusion welding replaces traditional spot welding and the fixed mode of ultraviolet curing glue, the skew and the not high problem of bonding strength after having avoided welding, optical fiber unable adjustment base's stability has been improved.

Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.

In the description of the present invention, it is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In the description of the present invention, it should be further noted that the terms "upper", "lower", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (6)

1. A flexible coupling device of a laser comprises a laser diode (1), a motor (8), a computer and an optical fiber which penetrates through the side wall of a laser tube shell (5) and is arranged between an upper pressure head group (9) and a lower pressure head group (12), wherein a gold-plated layer (11) for laser fusion welding is arranged at the contact part of the optical fiber and the laser tube shell (5), and a light beam emitted by the laser diode (1) enters the optical fiber; the upper pressure head group (9) comprises a plurality of flexible pressure columns of which the telescopic length is controlled by a motor (8), and the bottom ends of the flexible pressure columns and the upper ends of the lower pressure head group (12) form grooves for limiting optical fibers; and a force feedback device is arranged on the flexible compression leg, and the force feedback device and the motor (8) are connected with a computer.

2. The flexible coupling device of claim 1, wherein the bottom end of the flexible compression leg has a surface finish of an elastomeric medium that contacts the optical fiber.

3. A laser flexible coupling device according to claim 1 or 2, characterized in that the lower indenter group (12) comprises a plurality of supporting columns corresponding to the bottom ends of the flexible indenter, and the ends of the supporting columns are elastic contacts or rigid contacts with balls.

4. The flexible coupling device for laser device as claimed in claim 3, wherein the groove is a V-shaped groove.

5. The flexible coupling device of claim 1, wherein the TEC thermoelectric cooler (4), the heat sink base (3) and the AIN film substrate (2) are sequentially fixed on the inner bottom surface of the laser case (5) from bottom to top, and the laser diode (1) is fixed on the AIN film substrate (2).

6. The flexible coupling device of claim 1, wherein the light beams emitted by the laser diode (1) sequentially pass through the collimating lens (6) and the focusing lens (7) and then are converged into one beam to enter the optical fiber.

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