Device and method for welding optical fibre and end cap by utilizing circular spots

Abstract

The invention discloses a device and method for welding an optical fibre and an end cap by utilizing circular spots. The device comprises a laser generator, a laser shaping device and a laser focusingpart; the laser shaping device is used for changing bundle laser into circular laser; the end cap is placed between the laser shaping device and the laser focusing part; the laser focusing part is used for reflecting the circular laser and focusing the circular laser onto the welding end face of the end cap and the optical fibre; and the laser focusing part is provided with a through hole for theoptical fibre to pass through. According to the device and method for welding the optical fibre and the end cap by utilizing the circular spots in the invention, the bundle laser forms the circular laser parallel to the bundle laser under the matching action of a conical reflector and a circular table reflector; then, under the reflecting and focusing action of a circular table convergent reflector, the circular spots are formed on the welding end face of the end cap and the optical fibre; the optical fibre and the end cap are heated by utilization of the circular spots; the point is that theoptical fibre cannot shield laser; laser damage on the optical fibre is avoided; the quality of the optical fibre is ensured; welding of the optical fibre and the end cap is completed by adoption ofa laser beam; and thus, the cost is reduced.

Description

Technical field [0001] The invention relates to the field of laser technology, in particular to a device and method for fusion splicing optical fiber end caps with a ring-shaped spot. Background technique [0002] With the development of high-power solid-state lasers and fiber lasers, and the continuous improvement of the beam quality of high-power semiconductor lasers, the demand for high-power energy-transmitting fibers will increase. High-power energy-transmitting fiber is a necessary component for fiber-coupled output solid-state lasers and fiber lasers. The core technology in the production of high-power energy-transmitting fibers is fiber end cap fusion, so the development of large-size stepped fiber end cap fusion splicing devices is very great Practical significance. [0003] However, currently common methods for fusion splicing optical fiber end caps are the igniting method and the discharge method, but neither the igniting method nor the discharge method is easy to contr...

AI Technical Summary

Problems solved by technology

[0003] However, at present, the common methods of welding optical fiber end caps are the ignition method and the discharge method, but neither the ignition method nor the discharge method is easy to control, and it is easy to cause uneven fusion splicing effect, etc., and the operation is inconvenient

With the development of fusion splicing fiber end cap technology, the use of carbon dioxide laser as a heating source has become one of the main methods of end cap fusion technology, but multiple laser beams are required to form a heating closed loop, and multiple carbon dioxide lasers are required, resulting in higher costs

Moreover, in the existing method, the laser light will touch the optical fiber after being focused by the lens, and the optical fiber will be damaged because the core diameter of the optical fiber is very thin.

Images