ALL-FIBER VORTEX LIGHT LASER BASED ON RESONANCE OF ORBITAL ANGULAR MOMENTUM MODES

摘要

Disclosed is an all-fiber vortex light laser based on resonance of orbital angular momentum modes, the laser having an annular cavity structure, and comprising a narrow-linewidth pump laser (1), an optical amplifier (2), an orbital angular momentum mode generator (3), a first polarization controller (4), an optical fiber circulator (5), an optical fiber coupler (6), a second polarization controller (7) and a vortex optical fiber (8), wherein the orbital angular momentum mode generator (3) realizes the directional conversion from a fundamental transverse mode in a single-mode optical fiber into an orbital angular momentum mode with a specific topological charge in a vortex optical fiber; the optical fiber coupler (6) can realize directional coupling from an orbital angular momentum mode in one vortex optical fiber to an orbital angular momentum mode in another vortex optical fiber; the vortex optical fiber (8) is an optical fiber supporting stable transmission of an orbital angular momentum mode; and intracavity resonance amplification of the orbital angular momentum mode is realized based on Brillouin non-linear gain of the vortex optical fiber (8) inside an annular cavity, and vortex laser is output. The all-fiber vortex light laser uses an all-fiber structure, and the output vortex laser has good stability, narrow linewidth and high purity of an orbital angular momentum mode.