Vector light field regulation and control optical fiber based on nanometer grating array

Abstract

The invention relates to a vector light field regulation and control optical fiber based on a nanometer grating array. In the optical fiber, a femtosecond laser direct writing technology is used to implant the nanometer grating array in an internal portion; and through specific array configuration, unique corresponding vector mode of light is selected to pass through. If grating surface distribution of the nanometer grating array is a radiation type, a radial polarization vector light field can be correspondingly regulated, controlled and output, which is a TM01 model. If grating surface distribution of the nanometer grating array is an annular type, an angular polarization vector light field can be correspondingly regulated, controlled and output, which is a TE01 model. If grating surfacedistribution of the nanometer grating array is a staggered type, a mixed polarization vector light field can be correspondingly regulated, controlled and output, which is an HE21<o / e> model. And then, vector light field regulation and control in a broadband range can be realized. The structure of the vector light field regulation and control optical fiber is simple, one-time molding is realized,stability is high, and a wide application prospect is possessed in important fields of optical fiber communication, an optical integration, material processing, optical tweezers and the like.

Description

technical field [0001] The invention belongs to the field of vector light field control, and specifically relates to a vector light field control optical fiber based on a nano-grating array, that is, an optical fiber with a vector light field control function implanted with a nano-grating array inside the fiber through femtosecond direct writing technology. Background technique [0002] A vector light field is a light field with a unique spatially non-uniform distribution of polarization states. As one of the important characteristics of light, the polarization state plays an important role in the interaction between light and matter. The vector light field provides flexible and controllable amplitude, phase and polarization state distribution under focusing, and the precise control of the interaction process between the light field and matter enriches the new physics and new effects of the interaction between light and matter. Among them, the cylindrical vector light field...

AI Technical Summary

Problems solved by technology

But the vector mode degeneracy in the fiber will cause multiple vector light field mode coupling and crosstalk

For example, the high-order linearly polarized mode field LP transmitted in the fiber 11 It is formed by the degeneracy of four intrinsic cylinder vector modes with close transmission constants, that is, TM 01 , TE 01 , HE 21 o / e modes, which correspond to the radial polarization, angular polarization and mixed-state polarization beams of the cylindrical vector light field respectively. There is crosstalk between the four modes, but because their transmission constants and effective refractive indices are very close, it is difficult for general devices and methods to separate them separate

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