Optical fiber mode stripper and laser

The utility model provides an optical fiber mode stripper and a laser, the optical fiber mode stripper comprises a shell, a substrate and a plurality of optical fibers, and the shell is provided with an accommodating cavity; the substrate is mounted in the accommodating cavity; each optical fiber is provided with a bare optical fiber section with a coating layer stripped, the surface of the bare optical fiber section is provided with a plurality of grooves, the optical fibers are installed on one side face of the substrate, the bare optical fiber sections are located in the containing cavity, the two ends of the optical fibers extend out of the shell, the optical fibers are arranged at intervals in the direction perpendicular to the length of the optical fibers, and the bare optical fiber sections of the adjacent optical fibers are arranged oppositely in an inclined mode. The distances between the grooves, close to the optical fiber input ends, of the adjacent bare optical fiber sections and the sides where t