Laser etched pump light stripper and manufacturing method thereof

Abstract

The invention discloses a laser-etched pump light stripper and a manufacturing method thereof. The stripper comprises a fiber core and a fiber cladding, wherein the fiber core is wrapped by the fibercladding, and a plurality of grooves are formed on the outer surface of the fiber cladding. The manufacturing method comprises the following steps: setting a convex lens at the focusing position of the laser; focusing the laser beam on the fiber cladding through the convex lens, and etching a groove in the fiber cladding; moving the convex lens away from the focusing position, and moving the fibercladding to the next groove etching position; repeating the above two steps to etch a plurality of grooves in the fiber cladding. According to the invention, the plurality of grooves is arranged on the outer surface of the fiber cladding to form an attenuation area, so that pump light and some high-order mode stray light in the fiber cladding are stripped, and the quality of a laser beam is improved. In addition, the stripped light energy can be converted into heat energy to be taken away, so that the problem of over high temperature of the stripper is effectively solved, and the pump light stripper with good cladding light filtering effect that is unlikely to be burnt out is provided.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a laser-etched pump light stripper and a manufacturing method thereof. Background technique [0002] Optical stripper: A device that induces the conversion of the cladding mode to a radiation mode, usually made of a material with a refractive index equal to or greater than that of the fiber cladding. [0003] At present, high-power lasers are mainly used in cutting industrial materials. The working principle is that under the action of pump light, the laser energy level of the working material inside the gain fiber appears "particle number inversion", and passes through a positive feedback loop (to form a resonant cavity) Form the laser output. For high-power output fiber lasers, multimode double-clad fibers with thicker cores are usually used. Since the optical fiber is not single-mode, it participates in many laser oscillation modes in the fiber core, resulting in the fiber laser ...

AI Technical Summary

Problems solved by technology

However, the use of chemical agents is highly toxic, and the control accuracy is poor when corroding the optical fiber, so it is difficult to strip the cladding light clean

Images