System and method for preparing micro-nano optical fiber Bragg gratings

Abstract

The invention is applicable to the technical field of gratings, and provides a method and a system for preparing micro-nano optical fiber Bragg gratings. The system comprises a laser generating unit,a preparation unit, a displacement platform and an upper computer. Samples can be arranged on the displacement platform, and each sample is a micro-nano optical fiber coated with a layer of curing adhesive; the laser generating unit is used for generating femtosecond laser with preset power values and transmitting the femtosecond laser to the preparation unit; the preparation unit is used for focusing the femtosecond laser on the micro-nano optical fibers; the displacement platform can move under the control of the upper computer, so that radial scanning can be carried out by the femtosecond laser along the micro-nano optical fibers, and preliminarily arranged Bragg gratings can be cured on the micro-nano optical fibers. The method and the system in an embodiment of the invention have theadvantages that tedious grating sensitivity enhancement treatment procedures can be omitted when the micro-nano optical fiber Bragg gratings are prepared by the aid of the method and the system, grating periods can be controlled, and the micro-nano optical fiber Bragg gratings are high in reflectivity; the Bragg gratings prepared by the aid of the method and the system are cured on the surfaces ofthe micro-nano optical fibers and are extremely sensitive to external environments, and the system is low in cost.

Description

technical field [0001] The invention belongs to the technical field of gratings, and in particular relates to a preparation system and method for micro-nano fiber Bragg gratings based on femtosecond laser two-photon polymerization technology. Background technique [0002] In the prior art, Bragg gratings are mainly prepared by the following methods: [0003] 1. Phase mask method: use ultraviolet light to irradiate the phase mask plate, and the diffraction fringes are generated through the diffraction effect of the phase mask plate. On the optical fiber, when the micro-nano optical fiber is in the position of bright stripes, its photosensitive part will be exposed to change the refractive index to form a grating. The disadvantage of this method is that the phase mask is expensive and has a fixed period. [0004] 2. HF acid corrosion method: the raw material of bare optical fiber, silica, only reacts with HF acid (hydrofluoric acid), and the optical fiber with grating writte...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation system and method for micro-nano fiber Bragg gratings based on femtosecond laser two-photon polymerization technology, aiming to solve the problems of expensive grating preparation equipment and long preparation period in the prior art

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