Micro-nano fiber grating laser writing method and device

Abstract

The invention discloses a micro-nano fiber grating laser writing method and a micro-nano fiber grating laser writing device. The method comprises the following steps of: tapering normal multi-mode fibers; manufacturing micro-nano fibers; and then taking 193 nm ultraviolet laser as a scribing means. The device comprises a fiber clamp, and an ArF excimer laser, a 45-degree full power reflector, a cylindrical lens and a phase mask plate which are sequentially arranged, wherein the ArF excimer laser is used for emitting 193 nm ultraviolet laser; the tapered fiber is fixed on the fiber clamp; micro-nano fiber regions of the fibers are arranged in front of the phase mask plate in parallel; the 193 nm ultraviolet laser emitted by the ArF excimer laser is reflected through the 45-degree full power reflector and then vertically emitted to the cylindrical lens; and the phase mask plate is arranged in front of the cylindrical lens. According to the method and the device, extra processing for the fibers is not required, the mechanical strength and the toughness of the fibers are kept, the cost is low, the scribing efficiency is high, the bandwidth is narrow, the mode is controllable and the repeatability is high.

Description

technical field [0001] The invention relates to the research field of fiber grating writing methods, in particular to a micro-nano fiber grating laser writing method and device. Background technique [0002] As one of the most important photonic devices in the 20th century, fiber Bragg gratings (referred to as fiber gratings) have been widely used in the fields of optical fiber sensing and optical fiber communication due to their small size, high sensitivity, wavelength coding, and anti-electromagnetic interference. With the continuous development of optical fiber biomedical technology, many researchers have aimed at fiber grating devices as a new research direction for biosensing. However, the traditional fiber grating cannot use the evanescent field to interact with the outside world due to the thick cladding. Therefore, how to extend the application of fiber gratings in the detection direction of the refractive index of the external environment has become the focus and h...

AI Technical Summary

Problems solved by technology

The disadvantage is that the preparation of fiber gratings using femtosecond lasers is complex and costly. At the same time, the writing method of femtosecond lasers belongs to the quartz damage mechanism, which makes micro-nano fiber gratings very fragile and difficult to preserve.

Using this method, first of all, it is difficult to obtain sulfide optical fiber and the price is expensive; secondly, the structure of sulfide optical fiber is relatively special, and the core refractive index is as high as 2.7 (ordinary optical fiber is generally less than 1.5), so the fusion and coupling with the detection optical fiber is also the problem

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