Mode purity optimization method and system for vortex light beam generated through optical fiber laser coherent combination

Abstract

The invention provides a mode purity optimization method and system for a vortex light beam generated through optical fiber laser coherent combination. The mode purity optimization method comprises the steps of: generating an array light beam with a topological charge number and a radial order number as expected values based on optical fiber laser coherent combination; and designing a spatial filtering module, outputting the array light beam after being subjected to spatial filtering by a spatial filtering module, and transmitting output laser to a far field to form a high-mode-purity vortex light beam with a topological charge number and a radial order number being expected values. According to the mode purity optimization method and the system, mode purification processing is carried out on the array light beam output by an optical fiber laser coherent combination system before emission, side lobes of vortex light beams generated based on optical fiber laser coherent combination and other airspace high-frequency noise components are filtered out through a spatial filtering mode, unnecessary energy loss is avoided, and the mode purity of the vortex light beam generated by the target plane is optimized under the condition that the synthesis efficiency is ensured.

Description

Technical field[0001]The present invention relates to the field of fiber laser coherence synthesis techniques, and more particularly to a mode pureness optimization method and system for fiber laser coherence synthesis generating vortex beam.Background technique[0002]Fiber lasers have advantages of small size, good beam quality, convenient heat management, and have a wide range of applications in industrial processing, medical, scientific research. In order to increase the brightness of the optical fiber laser system output laser, the fiber laser coherence synthesis provides a promising method. Fiber laser coherence synthesis The dynamic phase noise of the effective compensation system is performed by performing a closed loop phase, so that each optical fiber laser is stabilized in the target plane, and the quality of the beam is maintained while boosting the output power. With the development of laser technology, by regulating the spatial distribution of the laser phase, the vortex...

AI Technical Summary

Problems solved by technology

For the vortex beam generated by coherent combination of fiber lasers, the existing generalized spatial filtering method cannot effectively filter out the side lobes that affect the purity of the mode, and the use of 4F optical system and circular diaphragm requires the 4F optical system and circular aperture. The parameters of the shaped diaphragm should be strictly designed, otherwise it will cause side lobes that cannot be filtered or unnecessary energy loss

Images