CN103064157A - Multichannel laser fiber coupling device - Google Patents

Abstract

The invention discloses a multi-channel laser fiber coupling device. It includes a coupling mirror (4) whose optical axis is parallel to the incident laser light (1) placed on the optical path of more than two parallel incident lasers (1), and an optical fiber (5) connected in series to the output end of the coupling mirror (4). , the input end of the coupling mirror (4) is connected in series with a prism group (3) fixed on the motor shaft (7), the motor shaft (7) is coaxial with the input optical path of the coupling mirror (4), and the prism group (3) It consists of more than two parallelogram prisms (2) whose long sides are perpendicular to the electrode machine axis (7) and whose acute angle is 45 degrees. The incident points of more than two incident lasers (1) are distributed on the axis of the motor (7). At the center of the circle, on a circle whose radius is the length of the long side of the parallelogram prism (2), the input ends of each laser emitting more than two incident lasers (1) are electrically connected to the output end of the laser power controller (6). It can be widely used in fields requiring high-power optical fiber output.

Description

Multi-channel laser fiber coupling device

technical field

The invention relates to a fiber coupling device, in particular to a multi-channel laser fiber coupling device.

Background technique

At present, high-power pulsed lasers output by optical fibers have been more and more widely used in industrial welding and cutting, laser lithotripsy and surgical cutting in the medical field. Based on the limitation of the output power of a single-channel laser, people have developed a multi-channel laser coupling technology, such as a two-channel laser fiber coupling output device that has been used recently. It is provided with a coupling mirror whose optical axis is parallel to the incident laser light, and an optical fiber connected in series to the output end of the coupling mirror on the optical path of two incident laser beams propagating parallel to each other. Although this laser fiber coupling output device can effectively couple two laser beams, it still has the disadvantage that it is difficult to greatly increase the laser power at the output end of the fiber, which restricts the use of holmium lasers in the field of gravel and other fields. Expand applications.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a multi-channel laser fiber coupling device with reasonable structure and high coupling efficiency.

In order to solve the technical problem of the present invention, the technical solution adopted is: the multi-channel laser fiber coupling device includes coupling mirrors whose optical axes are parallel to the incident laser light placed on more than two parallel incident laser light paths, and connected in series fiber at the output of the coupling mirror, in particular,

The input end of the coupling mirror is connected in series with a prism group fixed on the motor shaft;

The shaft of the motor is coaxial with the input optical path of the coupling mirror;

The prism group is composed of more than two parallelogram prisms, the long side of the parallelogram prism is perpendicular to the motor shaft, and its acute angle is 45 degrees;

The incident points of the two or more incident lasers are distributed on a circle with the motor shaft as the center and the length of the long side of the parallelogram prism as the radius;

The input end of each laser that emits more than two incident lasers is electrically connected to the output end of the laser power controller.

As a further improvement of the multi-channel laser fiber coupling device, the parallelogram prism is a white sapphire parallelogram prism; the output end of the laser power controller is electrically connected to the input end of the motor that drives the motor shaft; the parallelogram prism The length of the long side of the quadrilateral prism is 4cm; the rotational speed of the motor shaft is 10r/s; the incident laser is four, and the pulse width of each incident laser is 300-600us, and the repetition frequency is 10 times/s .

Compared with the prior art, the beneficial effect is that, on the basis of adopting a coupling mirror whose optical axis is parallel to the incident laser light placed on more than two parallel incident laser light paths, and an optical fiber connected in series at the output end of the coupling mirror, further A prism group fixed on the motor shaft is connected in series at the input end of the coupling mirror, wherein the motor shaft is coaxial with the input optical path of the coupling mirror, and the prism group is composed of more than two parallelogram prisms, and the long side of the parallelogram prism It is perpendicular to the motor shaft, and its acute angle is 45 degrees, and the incident points of more than two incident lasers are distributed on the circle with the motor shaft as the center and the length of the long side of the parallelogram prism as the radius. The technical scheme of electrically connecting the input end of each laser of the incident laser to the output end of the laser power controller, by controlling the pulse time output by each laser, it is possible to sequence more than two pulse incident lasers in an orderly manner per unit time And coupled into the optical fiber, it is equivalent to increasing the repetition rate of the laser per unit time, thereby greatly increasing the total power of the laser output from the optical fiber.

As a further embodiment of the beneficial effect, one is that the parallelogram prism is preferably a white gemstone parallelogram prism, which has not only fully utilized the advantage of the white gemstone’s light wave band width of 4500nm, but also because of the small temperature coefficient of the white gemstone. Its cooling feature ensures the stable and reliable operation of the device. The second is to preferably electrically connect the output end of the laser power controller to the input end of the motor that drives the motor shaft, which is more conducive to completely orderly sorting more than two pulsed incident lasers within a unit time. The third is that the length of the long side of the parallelogram prism is preferably 4 cm, which not only facilitates the installation of the drive motor, but also makes it have a smaller volume. Fourth, the rotational speed of the motor shaft is preferably 10r/s, which is not only applicable, but also small in vibration. Fifth, there are preferably four incident lasers, the pulse width of each incident laser is preferably 300-600us, and the repetition frequency is preferably 10 times/s. This optimized choice is conducive to completely realizing single-fiber coupling.

Description of drawings

The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a kind of basic structure schematic diagram of the present invention.

Fig. 2 is a schematic view of an incident laser direction when the prism group in Fig. 1 is composed of four parallelogram prisms.

Fig. 3 is a schematic diagram of the pulse sequence of four incident lasers.

FIG. 4 is a schematic diagram of the output pulse sequence after coupling the four-way pulse incident laser light shown in FIG. 3 according to the present invention.

Detailed ways

Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the composition of the multi-channel laser fiber coupling device is as follows: in the propagation direction of the incident laser light 1, a prism group 3 fixed on the motor shaft 7, a coupling mirror 4 and an optical fiber 5 are sequentially placed . in:

The incident laser 1 is four parallel to each other, the pulse width of each incident laser 1 is 300-600us, and the repetition frequency is 10 times/s;

The motor shaft 7 is coaxial with the input optical path of the coupling mirror 4, and its rotational speed is 10r/s;

The prism group 3 is composed of four parallelogram prisms 2 arranged at an angle of 90 degrees to each other. The long side of each parallelogram prism 2 is perpendicular to the motor shaft 7, and its acute angle is 45 degrees. Each parallelogram prism 2 are white gemstone parallelogram prisms, and the length of its long side is 4cm;

The incident points of each of the four incident laser beams 1 on the prism group 3 are distributed on a circle with the motor shaft 7 as the center and the length of the long side of the parallelogram prism 2 as the radius;

The input ends of each laser that emits four incident laser beams 1 are electrically connected to the output end of the laser power controller 6 , and the output end of the laser power controller 6 is electrically connected to the input end of the motor that drives the motor shaft 7 .

During use, the present invention is under the control of laser power supply controller 6, and each road incident laser light 1 is emitted according to the pulse sequence shown in Figure 3, because the distribution of four road incident laser light 1 equidistant is in the circle center with motor rotating shaft 7, The length of the long side of the parallelogram prism 2 is above the circumference of the radius, and the time interval of the laser pulses output from the optical fiber 5 is also equal, that is, the output end of the optical fiber 5 obtains a high-power laser output with dense pulse timing as shown in Figure 4 . Based on the fact that the pulse width of each incident laser 1 is 300-600us, the repetition frequency is 10 times/s, and the rotation speed of the motor shaft 7 is 10r/s, the motor shaft 7 rotates through 0.0377 radians within 600us. The length of the long side of the quadrilateral prism 2 is 4 cm, and its translational distance is 0.15 cm, so the single fiber coupling is completely realized.

Obviously, those skilled in the art can make various changes and modifications to the multi-channel laser fiber coupling device of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (6)

1. multi-path laser fiber coupling device, comprise its optical axis coupling mirror (4) parallel with incident laser (1) that places on the above incident laser of the two-way that parallels (1) light path, and the optical fiber (5) that is serially connected with coupling mirror (4) output terminal, it is characterized in that:

The input end of described coupling mirror (4) is serially connected with the prism group (3) that is fixed on the machine shaft (7);

Described machine shaft (7) is coaxial with the input light path of coupling mirror (4);

Described prism group (3) is comprised of the parallelogram prism (2) more than two, and the long limit of described parallelogram prism (2) is perpendicular to machine shaft (7), and its acute angle is 45 degree;

The incidence point of the above incident laser of described two-way (1) on prism group (3) be distributed in take machine shaft (7) as the center of circle, take the length on the long limit of parallelogram prism (2) on the circumference of radius;

The input end of each laser instrument of the above incident laser of described emission two-way (1) is electrically connected with the output terminal of laser power controller (6).

2. multi-path laser fiber coupling device according to claim 1 is characterized in that parallelogram prism (2) is white stone parallelogram prism.

3. multi-path laser fiber coupling device according to claim 2 is characterized in that the output terminal of laser power controller (6) is electrically connected with the input end of the motor of drive motor rotating shaft (7).

4. multi-path laser fiber coupling device according to claim 3 is characterized in that the length on the long limit of parallelogram prism (2) is 4cm.

5. multi-path laser fiber coupling device according to claim 4, the rotating speed that it is characterized in that machine shaft (7) is 10r/s.

6. multi-path laser fiber coupling device according to claim 5 is characterized in that incident laser (1) is four the tunnel, and the pulsewidth of its every road incident laser (1) is that 300～600us, repetition frequency are 10 times/s.

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