CN115598775A

CN115598775A - Coupling method and system for laser

Info

Publication number: CN115598775A
Application number: CN202210833067.8A
Authority: CN
Inventors: 贺亮; 张栋博; 赵忠锐; 梁斌; 牛峰博
Original assignee: Dalian Youxun Technology Co ltd; Wuhan Qianxi Technology Co ltd
Current assignee: Dalian Youxun Technology Co ltd; Wuhan Qianxi Technology Co ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2023-01-13
Also published as: CN114578499A; CN114578499B

Abstract

The present disclosure relates to a coupling method and system for a laser. The coupling method for the laser comprises the following steps: determining a position to be coupled of a collimating lens (14) so that light emitted from the light emitting chip (12) is collimated into parallel light via the collimating lens (14); and determining a position to be coupled of the first condensing lens (16) based on an active optical coupling method so that the parallel light is condensed at a predetermined position inside the package (11) via the first condensing lens (16), wherein the condensed light can be coupled with a tube core of the optical fiber at the predetermined position. According to the coupling method and the coupling system of the laser, the coupling of the optical device is realized through an active coupling method, and the coupling efficiency of the laser is obviously improved.

Description

Coupling method and system for laser

The present application is a divisional application filed on 2022, 5/9, application No. 202210495958.7 entitled "coupling method and system for laser".

Technical Field

Embodiments of the present disclosure relate generally to the field of optical communications, and more particularly, to coupling methods and systems for lasers.

Background

Some optical communication devices of an optical communication system include a semiconductor laser (e.g., a laser diode chip) as a light source. The laser has very wide application in the aspects of sensing, analog modulation and the like, the coupling efficiency is one of very concerned indexes of laser products, the improvement of the coupling efficiency plays a vital role in the improvement of the product performance, and the actual coupling efficiency in the actual production process is often greatly different from a theoretical value. The conventional coupling method of the laser is difficult to satisfy, and it is expected that the coupling efficiency of the laser can be improved.

Disclosure of Invention

Embodiments of the present disclosure provide a coupling method and system for a laser, which are directed to solving one or more of the problems set forth above and other potential problems.

According to a first aspect of the present disclosure, a coupling method for a laser is provided. The laser comprises a tube shell, and a light-emitting chip, a collimating lens and a first converging lens which are arranged in the tube shell and are sequentially arranged along an output optical axis of the laser, wherein the method comprises the following steps: determining a position to be coupled of the collimating lens so that light emitted from the light emitting chip is collimated into parallel light through the collimating lens; and determining a position to be coupled of the first converging lens based on an active optical coupling method, so that the parallel light is converged at a preset position in the inner part of the tube shell through the first converging lens, wherein the converged light can be coupled with a tube core of an optical fiber at the preset position.

In an embodiment according to the present disclosure, determining the position to be coupled of the collimating lens comprises: providing the collimating lens within the package to receive light emitted from the light emitting chip and collimate the received light; receiving the collimated light by a light receiving device, wherein the light receiving device is disposed outside the envelope; changing a position of the collimating lens along the output optical axis to change the first light indication received on the light receiving device; and determining a position to be coupled of the collimating lens based on the first indication on the light receiving device.

In an embodiment according to the disclosure, changing the position of the collimating lens along the output optical axis comprises: in response to the first light indication being less than a first predetermined threshold, moving the collimating lens toward or away from the light emitting chip, wherein the first predetermined threshold corresponds to a light indication obtained when the light emitting chip is at a focus of the collimating lens; and determining a to-be-coupled position of the collimating lens in response to the first light indication equaling a first predetermined threshold.

In an embodiment according to the disclosure, changing the position of the collimating lens along the output optical axis comprises: moving the collimating lens toward or away from the light emitting chip based on a positional relationship of the first light indication with respect to a predetermined mark position on the light receiving device, wherein the predetermined mark position is determined in relation to a light indication obtained when the light emitting chip is located at a focal point of the collimating lens; and determining a position of the collimating lens to be coupled in response to the first light indication being at the predetermined mark position.

In an embodiment according to the present disclosure, determining the to-be-coupled position of the first condensing lens based on an active coupling method includes: providing a second collection lens outside the envelope, wherein the second collection lens is oppositely opposed to the first collection lens such that light transmitted through the first collection lens is collected outside the envelope via the second collection lens; changing a position of the first converging lens along the output optical axis to change a second light indication received on the light receiving device; and determining a position to be coupled of the first converging lens based on the second light indication on the light receiving device.

In an embodiment according to the present disclosure, changing the position of the first converging lens along the output optical axis comprises: moving the first converging lens toward or away from the collimating lens in response to the second light indication being less than a second predetermined threshold, wherein the second predetermined threshold corresponds to a light indication obtained on the light receiving device by collimated light obtained through the second converging lens; and determining a to-be-coupled position of the first converging lens in response to the second light indication equaling a second predetermined threshold.

In an embodiment according to the present disclosure, changing the position of the first converging lens along the output optical axis comprises: moving the first condenser lens toward or away from the collimator lens based on a positional relationship of the second light indication with respect to a predetermined mark position on the light receiving device, wherein the predetermined mark position is determined in relation to a light indication obtained on the light receiving device by parallel light obtained through the second condenser lens; and determining a position of the first converging lens to be coupled in response to the second light indication being at the predetermined mark position.

In an embodiment according to the present disclosure, the second converging lens is held together with the first converging lens such that the second converging lens moves in synchronization with the first converging lens.

In an embodiment according to the present disclosure, a distance between the second and first converging lenses is a sum of a second focal length of the second converging lens and a first focal length of the first converging lens.

According to a second aspect of the present disclosure, a coupling system for a laser is provided. The laser comprises a tube shell, and a light emitting chip, a collimating lens and a first converging lens which are arranged in the tube shell and are sequentially arranged along an output optical axis of the laser and are to be optically coupled, wherein the coupling system comprises: a platform adapted to support the laser; a conditioning stage comprising a support arm, wherein the support arm is configured to change the position of the collimating lens and the first converging lens along the output optical axis to change the indication of light received on the light receiving device; and a light receiving device adapted to receive light for optical coupling to at least a first converging lens of the laser; the system also includes a second collection lens disposed outside of the envelope, wherein the second collection lens is oppositely opposed to the first collection lens such that the first collection lens is optically coupled through the second collection lens.

According to a third aspect of the present disclosure, a coupling system for a laser is provided. The laser comprises a tube shell, and a light emitting chip, a collimating lens and a first converging lens which are arranged in the tube shell and are sequentially arranged along an output optical axis of the laser and are to be optically coupled, wherein the coupling system comprises: a platform adapted to support the laser; an adjustment stage comprising a horizontally extending support arm, wherein the adjustment stage is adapted to adjust the position of the support arm; and light receiving means adapted to receive light for optical coupling to optics of the laser; the support arm is adapted to hold the first converging lens or collimating lens and to be able to adjust the position of the first converging lens or collimating lens on the output optical axis; the system further includes a second converging lens disposed on the exterior of the tube envelope, wherein the second converging lens is oppositely opposed to the first converging lens such that convergence occurs through the second converging lens on the exterior of the tube envelope by passing through the first converging lens.

In an embodiment according to the present disclosure, the support arm comprises a first section and a second section arranged along the extension direction, wherein the second section is adapted to be releasably rigidly attached to the first section and to hold the optics.

In an embodiment according to the disclosure, the coupling system further comprises a vertically extending suspension arm adapted to be mounted to the second section, wherein one end of the suspension arm is rigidly attached to the support arm and the other end of the suspension arm is adapted to hold the first converging or collimating lens for optical coupling thereof by adjusting the position of the support arm to change the position of the first converging or collimating lens.

In an embodiment according to the present disclosure, the suspension arm comprises a hollow tube, wherein the hollow tube is adapted to be connected to a vacuum pump to hold the respective optical element by vacuum suction.

In an embodiment according to the present disclosure, the suspension arm comprises a first suspension arm adapted to simultaneously hold the first and second converging lenses at its ends such that the first and second converging lenses move synchronously.

In an embodiment according to the present disclosure, the first suspension arm is Y-shaped and holds the respective converging lens by an end of a respective leg of the Y-shape.

In an embodiment according to the present disclosure, a distance between an end of the first suspension arm for holding the second converging lens and an end of the first converging lens is a sum of the second focal length of the second converging lens and the first focal length of the first converging lens.

In an embodiment according to the present disclosure, the suspension arm comprises a second suspension arm being linear and adapted to hold the collimator lens at an end thereof.

In an embodiment according to the present disclosure, the first and second sections are magnetically attached, the suspension arm being adapted to be magnetically attached to the second section.

In an embodiment according to the present disclosure, the conditioning station is configured to: in the process of coupling for the collimating lens, the collimating lens is moved towards or away from the light-emitting chip based on a first light indication of light which is received by a light receiving device and collimated by the collimating lens, so that the position to be coupled of the collimating lens is determined according to the first light indication.

In an embodiment according to the present disclosure, the conditioning station is configured to: during the coupling process for the first converging lens, at least the first converging lens is moved towards or away from the light-emitting chip based on a second light indication of light received by a light receiving device, the light being collimated by the collimating lens and then sequentially passing through the first converging lens and the second converging lens, so that the position to be coupled of the first converging lens is determined according to the second light indication.

According to a fourth aspect of the present disclosure, there is provided a coupling method for a laser, characterized in that the laser includes a package and a light emitting chip, a collimating lens, and a first condensing lens arranged in the package in this order along an output optical axis of the laser. The method comprises the following steps:

determining a position to be coupled of the collimating lens so that light emitted from the light emitting chip is collimated into parallel light by the collimating lens;

providing a second converging lens and a light receiving device external to said envelope, said light receiving device being located downstream of said second converging lens along said output optical axis; and

determining a position of the first collecting lens to be coupled by means of the second collecting lens and the light receiving device, wherein the second collecting lens is opposite to the first collecting lens so that the light passing through the first collecting lens passes through the second collecting lens to be received by the light receiving device.

According to the coupling method and the coupling system of the laser, the coupling of the optical device is realized through an active coupling method, and the coupling efficiency of the laser is obviously improved.

Drawings

The above and other objects, features and advantages of the embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. In the drawings, several embodiments of the present disclosure are shown by way of example and not limitation.

Fig. 1 shows a schematic diagram of a coupling system for a laser according to an embodiment of the present disclosure.

Fig. 2 shows a flow diagram of a coupling method for a laser according to an embodiment of the present disclosure.

Fig. 3 shows a schematic optical path diagram of a coupling method for a laser according to an embodiment of the present disclosure.

Fig. 4 shows a flow diagram of a coupling method for a laser according to an embodiment of the present disclosure.

Fig. 5 shows a schematic optical path diagram of a coupling method for a laser according to an embodiment of the present disclosure.

Fig. 6 shows a flow chart of a coupling method for a laser according to an embodiment of the present disclosure.

Fig. 7 shows a schematic optical path diagram of a coupling method for a laser according to an embodiment of the present disclosure.

Like or corresponding reference characters indicate like or corresponding parts throughout the several views.

Detailed Description

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "upper," "lower," "front," "rear," and the like are used to indicate placement or positional relationships based on the orientation or positional relationship shown in the drawings, merely for convenience in describing the principles of the disclosure, and are not intended to indicate or imply that the elements so referred to must be in a particular orientation, constructed or operated in a particular orientation, and therefore should not be taken as limiting the disclosure.

The coupling efficiency of a laser has always been one of the important indicators of a laser. To this end, a laser is proposed, which comprises a double lens. In this laser, light emitted from a light emitting chip of the laser first passes through a collimating lens to become parallel light, and then passes through a condensing lens to enter an optical fiber. It can be found by simulations of, for example, zemax software that the coupling efficiency of such a laser of the two-lens system is improved by up to 10% or even more than that of the laser of the single-lens system.

However, significant technical challenges are encountered when implementing such a scheme within a laser. This is because the light spot after the light collimated by the collimating lens is converged by the condensing lens is located inside the laser, which makes active coupling with respect to the condensing lens impossible. Therefore, how to position the dual lens in the laser to realize the precise optical coupling of the optical devices and further to ensure the performance of the above theoretical analysis is an urgent technical problem to be solved.

In view of the above, the inventors of the present disclosure have made extensive studies to propose an active optical coupling method based on which optical coupling of lasers is achieved. Thereby, the actual coupling of the laser is ensured to meet the theoretical design performance. A coupling method and system for lasers according to embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

Fig. 1 shows a coupling system 100 for a laser 10. The coupling system 100 may include a stage 30, a conditioning stage 40, and a light receiving device 20. The platform 30 forms the operating platform for the coupling system 100 of the laser. The platform 30 may be a floor or a console disposed on the floor. The platform 30 may support the laser 10. The laser 10 includes a package 11 and a light emitting chip 12 to be optically coupled, a collimator lens 14, and a first condenser lens 16 (see also the optical path diagrams of the embodiments described with reference to fig. 3, 5, and 7) arranged in the package 11 in this order along the output optical axis of the laser 10. The coupling system 100 according to the present disclosure enables efficient optical coupling between the light emitting chip 12, the collimating lens 14 and the first converging lens 16.

The conditioning stage 40 can be moved in multiple degrees of freedom to implement the optical coupling. As shown in fig. 1, the package 11 can be held in an open state, and the adjustment stage 40 can move the optical device in a suspended manner from above to achieve optical coupling of the optical device. This is merely exemplary and the relative movement between the package 11 and the optics may be achieved in other ways, for example the optics may be held stationary and only the package 11 moved to effect the optical coupling.

In some embodiments, the adjustment stage 40 can include a horizontally extending support arm 50, wherein the adjustment stage 40 is adapted to adjust the position of the support arm 50. In some embodiments, the adjustment stage 40 may comprise a six-axis displacement adjustment stage to achieve 6 degrees of freedom of adjustment. The support arm 50 may be adapted to hold the first converging lens 16 or collimating lens 14 and may be movable in response to adjustment actions of the adjustment stage 40 to adjust the position of an optical device attached to the support arm 50.

The light receiving device 20 is adapted to receive light emitted from the laser 10. The light received by the light receiving device 20 may be optically coupled to the optics in the laser 10. In the coupling method according to the embodiment of the present disclosure, during the coupling process of the optical device, the light may be received by the light receiving device 20 to provide a light indication of the received light, whereby the active coupling of the optical device may be achieved through the light indication. In some embodiments, the light receiving device 20 may include a visually visible indication whereby a user may conveniently visually observe the received light signal. In some embodiments, the light receiving device 20 may provide a numerical indication (e.g., a light intensity indication), whereby a user may determine information about the intensity of the received light by observing the intensity of the light.

The coupling system 100 may further comprise a second converging lens 18 (see also the optical path diagrams of the embodiments described with reference to fig. 3, 5 and 7) arranged outside the envelope 11, wherein the second converging lens 18 is oppositely opposed to the first converging lens 16 so as to converge outside the envelope 11 through the first converging lens 16 via the second converging lens 18. Active coupling of the first converging lens 16 may be achieved by the second converging lens 18. Which will be described in detail later with reference to other figures.

In some embodiments, the support arm 50 may comprise a plurality of segments. This has significant benefits in the optical coupling process. In some embodiments, the support arm 50 may include a first section 52 and a second section 54 that extend in a direction. Wherein the second section 54 is adapted to be releasably rigidly attached to the first section 52 and to the optical device to provide an optical coupling for the optical device. By the structure of the plurality of segments, it is possible to easily hold the optical device without any structural change to the conventional support arm 50, thereby making it simple to adjust the coupling position of the optical device in a suspension method.

In some embodiments, a vertically extending hanger arm 60 is adapted to be mounted to the second section 54. One end of the suspension arm is rigidly attached to the support arm 50 and the other end of the suspension arm is adapted to hold the first converging lens 16 or the collimating lens 14. Thus, the position of first collecting lens 16 or collimating lens 14 can be changed by adjusting the position of support arm 50 to optically couple first collecting lens 16 or collimating lens 14.

In some embodiments, hanger arm 60 comprises a hollow tube. The hollow tubes are adapted to be connected to a vacuum pump 68 by means of hoses 67 to hold the respective optical elements by vacuum suction. In this way, retention and release of the optic can be conveniently achieved.

In some embodiments, the hanger arm may comprise a first hanger arm. The first suspension arm is adapted to simultaneously hold at its ends a first converging lens 16 and a second converging lens 18. With this structure, it is possible to easily realize that the first and second converging

lenses

16 and 18 move in synchronization. This can greatly improve the efficiency of the optical coupling operation of the laser.

In some embodiments, as shown in fig. 1, the first hanger arm may be Y-shaped and retain the respective converging lens at the ends of the respective legs of the Y-shape. Such a shape is particularly suitable for vacuum suction and enables holding and releasing of the optical device at low cost.

In some embodiments, the distance between the end of the first suspension arm holding the second converging lens 18 and the end of the first converging lens 16 is the sum of the second focal length of the second converging lens 18 and the first focal length of the first converging lens 16. With this structure, it is possible to coincide the focal point of the first condenser lens 16 and the focal point of the second condenser lens 18 arranged in the opposite direction to ensure that the light transmitted through the second condenser lens 18 is parallel light. This has significant benefits in terms of active coupling of the first converging lens 16 (described in detail later).

In some embodiments, the suspension arm may further comprise a second suspension arm (not shown in the figures) which is linear and adapted to hold the collimator lens 14 at its end. The choice of whether to use the first or second hanger arm can be made according to the requirements of the optical coupling. It is appreciated that the first and second hanger arms may take other suitable shapes than those shown in the illustrated embodiment.

The first section and the second section may include a variety of attachment means. In some embodiments, first section 52 and second section 54 are attached by magnetism. Where the coupling platform is open, magnetic attachment is convenient. In some embodiments, the hanger arm may comprise a ferromagnetic material, whereby the hanger arm is adapted to be magnetically attached to the second section 54.

In some embodiments, the conditioning station 40 may be configured to: during the coupling process for the collimating lens 14, based on the first light indication after being collimated by the collimating lens 14 received by the light receiving device 20, the collimating lens 14 is moved toward or away from the light emitting chip 12, so that according to the first light indication, the to-be-coupled position of the collimating lens 14 is determined and the collimating lens 14 is fixed at the determined to-be-coupled position. Thus, the optical coupling of the collimator lens 14 can be conveniently achieved by means of the adjustment stage 40.

In some embodiments, the conditioning station 40 may be configured to: in the process of coupling for the first condenser lens 16, based on a second light indication of light collimated by the collimating lens 14 received by the light receiving device 20 and then sequentially passed through the first and

second condenser lenses

16 and 18, at least the first condenser lens 16 is moved toward or away from the light emitting chip 12, so that according to the second light indication, a position to be coupled of the first condenser lens 16 is determined and the first condenser lens 16 is fixed at the determined position to be coupled. Thus, the optical coupling of the collimator lens 14 can be conveniently achieved by means of the adjustment stage 40.

Fig. 2 shows a flow diagram of a coupling method 200 for a laser according to an embodiment of the present disclosure. Method 200 may include the following actions. At block 202, a position to be coupled of the collimating lens 14 is determined such that light emitted from the light emitting chip 12 is collimated into parallel light via the collimating lens 14. At block 204, based on the active optical coupling method, a position to be coupled of the first converging lens 16 is determined such that the parallel light is converged at a predetermined position inside the envelope 11 via the first converging lens 16, wherein at the predetermined position the converged light can be coupled with the die of the optical fiber.

It is worth noting that the term "active optical coupling" should be understood as the transmission light being able to pass through the first converging lens 16 and to optically couple the first converging lens 16 based on the detection of light passing through the first converging lens 16. According to the coupling method 200 for a laser according to the embodiment of the present disclosure, since the first condensing lens 16 is a coupling position determined based on the method of active optical coupling, it is possible to ensure optical coupling efficiency between the collimating lens 14 and the first condensing lens 16.

A schematic diagram for coupling the collimating lens 14 according to an embodiment of the present disclosure is described below in conjunction with fig. 3 and 4. Fig. 3 shows a schematic optical path diagram for coupling of lasers according to an embodiment of the present disclosure. Fig. 4 shows a flow diagram of a coupling method 400 for a laser according to an embodiment of the disclosure.

As shown in fig. 3, the laser 10 may include a light emitting chip 12 and a collimating lens 14 arranged in sequence along an output optical axis of the laser 10. The light emitting chip 12 and the collimator lens 14 are arranged within a package 11 (shown in dashed lines in fig. 3) of the laser. The light emitted by the laser can be detected by a light receiving means 20 arranged outside the envelope. In the illustrated embodiment, the receiving device 20 is configured to receive light emitted from the light emitting chip 12 after being collimated by the collimating lens 14.

The coupling method 400 may include the following actions. At block 402, a collimating lens 14 is provided within the envelope 11. The collimating lens 14 may receive light emitted from the light emitting chip 12 and collimate the received light. At block 404, collimated light is received by the light receiving device 20. At block 406, the position of the collimating lens 14 is changed along the output optical axis to change the first light indication received on the light receiving device 20. In some embodiments, a second suspension arm may be attached to the support arm 50, and the collimating lens 14 may be changed by moving the support arm 50 along the optical axis. At block 408, based on the first indication on the light receiving device 20, the position to be coupled of the collimating lens 14 is determined.

In some embodiments, the light emitting chip 12 and the collimating lens 14 may be aligned along the output optical axis by the conditioning stage 40. Then, the position of the collimator lens 14 is changed along the output optical axis to determine the optimal light coupling position of the collimator lens 14. Once the optimal light coupling position of the collimator lens 14 has been determined, the collimator lens 14 can be fixed or pre-fixed in the housing and the optical coupling of the first converging lens 16 can then be continued.

In some embodiments, changing the position of the collimating lens 14 along the output optical axis may include: in response to the first light indication being less than a first predetermined threshold corresponding to the light indication obtained when the light emitting chip 12 is at the focus of the collimating lens 14, the collimating lens 14 is moved towards or away from the light emitting chip 12. In response to the first light indication being equal to the first predetermined threshold, the position of the collimating lens 14 to be coupled is determined and the collimating lens 14 is fixed at the determined position of the coupling. This is particularly suitable in the case where the light receiving means 20 provides a numerical indication of the light intensity, whereby the light coupling position of the collimator lens 14 can be easily determined by easily determining whether the first light indication is of a predetermined size or not.

In some embodiments, changing the position of the collimating lens 14 along the output optical axis may include: the collimator lens 14 is moved toward or away from the light-emitting chip 12 based on the positional relationship of the first light indication with respect to a predetermined mark position on the light-receiving device 20, which is determined in relation to the light indication obtained when the light-emitting chip 12 is located at the focal point of the collimator lens 14. In response to the first light indication being at the predetermined mark position, the position to be coupled of the collimator lens 14 is determined and the collimator lens 14 is fixed at the determined position to be coupled. This is particularly suitable in the case where the light receiving device 20 provides a light spot indication, whereby the user can easily observe the position of the predetermined mark position by determining whether the first light indication matches the predetermined mark position.

After the coupling position of the collimator lens 14 is determined, the coupling position of the first converging lens 16 is further determined. A schematic diagram for coupling the first converging lens 16 according to an embodiment of the present disclosure is described below with reference to fig. 5 and 6. Fig. 5 shows a schematic of optical paths for coupling of lasers according to an embodiment of the present disclosure. Fig. 6 shows a flow diagram of a coupling method 600 for a laser according to an embodiment of the disclosure.

As shown in fig. 5, the laser 10 may include a light emitting chip 12, a collimating lens 14, and a first condensing lens 16, which are sequentially arranged along an output optical axis of the laser 10. The light emitting chip 12, the collimator lens 14 and the first condenser lens 16 are arranged within a package 11 (shown in dashed lines in fig. 5) of the laser. The light emitted by the laser can be detected by a light receiving means 20 arranged outside the envelope.

Considering that the first converging lens 16 is located inside the laser and the light transmitted through the first converging lens 16 is converged inside the laser, i.e. at the location of the focal point F of the first converging lens 16 in fig. 5, no active coupling for the first converging lens 16 can be provided inside the envelope of the laser. According to the coupling method of the embodiment of the present disclosure, the second condensing lens 18 is provided outside the envelope 11. A second converging lens 18 is arranged opposite the first converging lens 16 in order to achieve active optical coupling of the first converging lens 16 by means of the second converging lens 18.

As shown in fig. 5, a second condenser lens 18 is further provided outside the envelope 11. Thus, the light emitted from the light emitting chip 12 is first collimated into parallel light by the collimating lens 14, and then the parallel light is converged by the first converging lens 16, and the converged light is focused to the focal point F inside the envelope. The focused light is converged by the backward second converging lens 18 and finally received by the light receiving device 20. Thus, optical coupling of the first converging lens 16 may be achieved through cooperative operation of the receiving device 20 and the second converging lens 18.

As shown in fig. 6, the coupling method 600 may include the following actions. At block 602, a second collection lens 18 is provided outside the envelope 11, wherein the second collection lens 18 is oppositely opposed to the first collection lens 16 such that light transmitted through the first collection lens 16 is collected outside the envelope 11 via the second collection lens 18.

At block 604, the position of the first converging lens 16 is changed along the output optical axis to change the second light indication received on the light receiving device 20. In some embodiments, a second suspension arm can be attached to the support arm 50, and the position of the first converging lens 16 can be changed by moving the support arm 50 along the optical axis. At block 606, a position to be coupled of the first converging lens 16 is determined based on the second light indication on the light receiving device 20.

In some embodiments, the light emitting chip 12, the collimating lens 14, and the first converging lens 16 may be aligned along the output optical axis by the conditioning stage 40. Then, the position of the first converging lens 16 is changed along the output optical axis to determine the optimal light coupling position of the first converging lens 16. Once the optimal light coupling position of the first converging lens 16 is determined, the first converging lens 16 may be fixed or pre-fixed in the envelope.

In some embodiments, changing the position of the first converging lens 16 along the output optical axis comprises: in response to the second light indication being less than a second predetermined threshold corresponding to a light indication obtained by the converged light passing through the second converging lens 18 at a focal point of the second converging lens 18, the first converging lens 16 is moved toward or away from the collimating lens 14. In response to the second light indication being equal to the second predetermined threshold, the position of the first converging lens 16 is determined and the first converging lens 16 is fixed at the determined position.

In some embodiments, changing the position of the first converging lens 16 along the output optical axis comprises: the first condenser lens 16 is moved toward or away from the collimator lens 14 based on a positional relationship of the second light indication with respect to a predetermined mark position on the light receiving device 20, which is determined in relation to the light indication on the light receiving device 20 of the parallel light obtained by the condensed light passing through the second condenser lens 18 at the focal point of the second condenser lens 18. In response to the second light indication being at the predetermined marker position, the position of the first converging lens 16 is determined and the first converging lens 16 is fixed at the determined position.

Fig. 7 shows a schematic of optical paths for coupling of lasers according to an embodiment of the present disclosure. Fig. 7 is similar to fig. 5, showing an overall cross-sectional schematic structure of the laser in the embodiment of fig. 7, and also schematically showing the first suspension arm 65. In view of the similarity between fig. 7 and 5, the differences between the embodiments shown in fig. 7 and 5 will be emphasized.

As shown in fig. 7, the laser 10 may include a light emitting chip 12, a collimating lens 14, and a first condensing lens 16, which are sequentially arranged along an output optical axis of the laser 10. The light emitting chip 12, the collimator lens 14 and the first condenser lens 16 are arranged within the laser package 11. The active optical coupling of the first converging lens 16 can be achieved by a second converging lens 18 and a light receiving device 20 arranged outside the envelope.

As shown in fig. 7, the second converging lens 18 and the first converging lens 16 may be held together by a first suspension arm 65 so that the second converging lens 18 moves in synchronization with the first converging lens 16. Since the second converging lens 18 moves in synchronization with the first converging lens 16, the coupling position of the first converging lens 16 can be quickly determined within a small movement range, thereby improving the efficiency of the coupling operation.

In some embodiments, the distance between the second converging lens 18 and the first converging lens 16 is the sum of the second focal length d2 of the second converging lens 18 and the first focal length d1 of the first converging lens 16. As shown in fig. 7, the focal point of the second converging lens 18 coincides with the focal point of the first converging lens 16 at position F. Thus, regardless of the position of the first condenser lens 16 on the optical axis, it is always ensured that the light passing through the first and

second condenser lenses

16 and 18 is parallel light, so that the light receiving device 20 determines the coupling position.

As shown in fig. 7, the first hanger arm 65 may be attached to the second section 54 of the support arm 50. First hanger arm 65 may be in the form of a hollow tube to facilitate holding second converging lens 18 and first converging lens 16 by a vacuum. The first hanger arm 65 may include a main pipe 62 and

branch pipes

64, 66 branching away from the main pipe 62. The first and second converging

lenses

16, 18 may be held by the ends of the

branch pipes

64, 66, respectively. In the illustrated embodiment, the first suspension arm 65 may be a Y-shaped suction nozzle. It is worth noting that this is merely exemplary and that the first suspension arm 65 may be other suitable shapes. In order to facilitate the connection between the end of the branch pipe and the lens, the contact part of the end of the suction nozzle and the lens follows the shape of the lens, so as to ensure the sufficient contact between the suction nozzle and the corresponding lens and achieve the best suction effect.

In accordance with the present disclosure, there is provided a coupling system for a laser (10), the laser (10) including a package (11) and a light emitting chip (12) to be optically coupled, a collimating lens (14), and a first condensing lens (16) arranged within the package (11) in order along an output optical axis of the laser (10), the coupling system comprising:

a platform (30) adapted to support the laser (10);

an adjustment stage (40) comprising a horizontally extending support arm (50), wherein the adjustment stage (40) is adapted to adjust the position of the support arm (50); and

-light receiving means (20) adapted to receive light for optical coupling to optics of the laser (10);

said support arm (50) being adapted to hold said first converging lens (16) or collimating lens (14) and to enable adjustment of the position of said first converging lens (16) or collimating lens (14) on said output optical axis;

the system further comprises a second converging lens (18) arranged outside the tube envelope (11), wherein the second converging lens (18) is oppositely opposed to the first converging lens (16) such that convergence via the second converging lens (18) is performed outside the tube envelope (11) by passing through the first converging lens (16).

Aspect 2. The coupling system according to aspect 1, wherein the support arm (50) comprises a first section (52) and a second section (54) arranged in the direction of extension, wherein the second section (54) is adapted to be releasably rigidly attached to the first section (52) and to hold the optical device.

Aspect 3. The coupling system according to aspect 2, further comprising a vertically extending suspension arm (60), the suspension arm (60) being adapted to be mounted to the second section (54), wherein one end of the suspension arm is rigidly attached to the support arm (50) and the other end of the suspension arm is adapted to hold the first converging lens (16) or collimating lens (14), the optical coupling of the first converging lens (16) or collimating lens (14) being performed by adjusting the position of the support arm (50) to change the position of the first converging lens (16) or collimating lens (14).

Aspect 4. The coupling system of aspect 3, wherein the suspension arm comprises a hollow tube, wherein the hollow tube is adapted to be connected to a vacuum pump to hold the respective optical element by vacuum suction.

Aspect 5. The coupling system according to aspect 4, characterized in that said suspension arm comprises a first suspension arm adapted to simultaneously hold at its ends said first (16) and said second (18) converging lenses so that said first (16) and said second (18) converging lenses move synchronously.

Aspect 6. The coupling system of aspect 5, wherein the first suspension arm is Y-shaped and holds the respective converging lens by an end of the respective leg of the Y-shape.

Aspect 7. The coupling system according to aspect 5, wherein the distance between the end of the first suspension arm holding the second converging lens (18) and the end of the first converging lens (16) is the sum of the second focal length of the second converging lens (18) and the first focal length of the first converging lens (16).

Aspect 8. The coupling system according to aspect 5, wherein the suspension arm comprises a second suspension arm, which is linear and adapted to hold the collimator lens (14) at its end.

Aspect 9. The coupling system according to any of aspects 2-8, wherein the first section (52) and the second section (54) are magnetically attached, and the suspension arm is adapted to be magnetically attached to the second section (54).

Aspect 10. The coupling system according to any one of aspects 1-8, wherein the conditioning stage (40) is configured to:

during the coupling process for the collimating lens (14), the collimating lens (14) is moved towards or away from the light emitting chip (12) based on a first light indication of the light collimated by the collimating lens (14) received by a light receiving device (20), so that the position of the collimating lens (14) to be coupled is determined according to the first light indication.

The coupling system of aspect 11, according to aspect 10, characterized in that the conditioning stage (40) is configured to:

during the coupling process for the first converging lens (16), at least the first converging lens (16) is moved towards or away from the light emitting chip (12) based on a second light indication of light received by a light receiving device (20) which is collimated by the collimating lens (14) and then passes through the first converging lens (16) and the second converging lens (18) in sequence, so that the position of the first converging lens (16) to be coupled is determined according to the second light indication.

Aspect 12. A coupling method for a laser (10), the laser (10) comprising a package (11) and, disposed within the package (11), a light emitting chip (12), a collimating lens (14), and a first converging lens (16) arranged in sequence along an output optical axis of the laser (10), the method comprising:

determining a position to be coupled of the collimating lens (14) so that light emitted from the light emitting chip (12) is collimated into parallel light through the collimating lens (14);

-providing a second converging lens (18) and a light receiving device (20) outside said envelope (11), said light receiving device (20) being located downstream of said second converging lens (18) along the output optical axis; and

determining a position of the first converging lens (16) to be coupled by means of the second converging lens (18) and the light receiving device (20), wherein the second converging lens (18) is oppositely disposed to the first converging lens (16) such that light passing through the first converging lens (16) passes through the second converging lens (18) to be received by the light receiving device (20).

Further, while operations are depicted in a particular order, this should be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A coupling system for a laser (10), the laser (10) comprising a package (11) and a light emitting chip (12), a collimating lens (14) and a first converging lens (16) to be optically coupled arranged in the package (11) in that order along an output optical axis of the laser (10), the coupling system comprising:

a platform (30) adapted to support the laser (10);

the support arm (50) is adapted to hold the first converging lens (16) or collimating lens (14) and to be able to adjust the position of the first converging lens (16) or collimating lens (14) on the output optical axis;

the system further comprises a second converging lens (18) arranged outside the envelope (11), wherein the second converging lens (18) is oppositely opposed to the first converging lens (16) such that convergence via the second converging lens (18) is performed outside the envelope (11) by passing through the first converging lens (16).

2. The coupling system according to claim 1, wherein the support arm (50) comprises a first section (52) and a second section (54) arranged along the extension direction, wherein the second section (54) is adapted to be releasably rigidly attached to the first section (52) and to hold the optical device.

3. The coupling system of claim 2, further comprising a vertically extending suspension arm (60), the suspension arm (60) being adapted to be mounted to the second section (54), wherein one end of the suspension arm is rigidly attached to the support arm (50) and the other end of the suspension arm is adapted to hold the first converging lens (16) or collimating lens (14), the optical coupling of the first converging lens (16) or collimating lens (14) being performed by adjusting the position of the support arm (50) to change the position of the first converging lens (16) or collimating lens (14).

4. The coupling system of claim 3, wherein the suspension arm comprises a hollow tube, wherein the hollow tube is adapted to be connected to a vacuum pump to hold the respective optical element by vacuum suction.

5. The coupling system according to claim 4, wherein said suspension arm comprises a first suspension arm adapted to simultaneously hold at its ends said first (16) and said second (18) converging lenses so that said first (16) and said second (18) converging lenses are moved synchronously.

6. The coupling system of claim 5, wherein the first suspension arm is Y-shaped and holds the respective converging lens at an end of the respective leg of the Y-shape.

7. The coupling system according to claim 5, wherein the distance between the end of the first suspension arm for holding the second converging lens (18) and the end of the first converging lens (16) is the sum of the second focal length of the second converging lens (18) and the first focal length of the first converging lens (16).

8. The coupling system of claim 5, wherein the suspension arm comprises a second suspension arm which is linear and adapted to hold the collimator lens (14) at its end.

9. The coupling system according to any one of claims 2-8, wherein the first section (52) and the second section (54) are attached by magnetism, the suspension arm being adapted to be attached to the second section (54) by magnetism.

10. The coupling system according to any one of claims 1-8, wherein the adjustment stage (40) is configured to:

during the coupling process for the collimating lens (14), the collimating lens (14) is moved towards or away from the light emitting chip (12) based on a first light indication of the light collimated by the collimating lens (14) received by a light receiving device (20), so that according to the first light indication, the position of the collimating lens (14) to be coupled is determined.

11. The coupling system of claim 10, wherein the conditioning stage (40) is configured to:

12. A coupling method for a laser (10), the laser (10) comprising a package (11) and a light emitting chip (12), a collimating lens (14) and a first condensing lens (16) arranged in the package (11) in sequence along an output optical axis of the laser (10), the method comprising: