Fabrication of Long-Period Fiber Grating Using He-Cd Laser

以氦鎘雷射製作長週期光纖光柵

何淳雪(Chwen-Shell Ho) ； 魏慶維(Chung-Wei Wei) ； 黃君偉(Jiun-Woei Huang)

《中原學報》 28卷3期 (2000/09) Pp. 23-25

https://doi.org/10.6358/JCYU.200009.0023

摘要

光纖光柵依其結構及工作原理的差異，可分為穿透式長週期光纖光柵及反射式布拉格光纖光柵兩種。近年來所發展出的長週期光纖光柵經發現在感測應用上，其溫度、應力的感測靈敏度均比布式光纖光柵高，使其應用價值具有相當的潛力。本實驗採用功率較低、波長較長之連續式氦鎘雷射為曝曬光源，以取代一般研究報告常用之高功率準分子雷射，並配合電腦自動控制精密移動平台，以逐點燒寫的方法製作長週期光纖光柵。同時完成了自製長週期光纖光柵之特性探討，其中包括不同曝曬時間、不同光柵週期及不同光柵長度的光纖光柵製作，及其穿透頻譜的量測，其結果均與理論相符合。

關鍵字

光纖光柵 ； 氦鎘雷射 ； 逐點燒寫方法

並列摘要

Fiber grating, as an electro-optic component, has been used as a sensor in communications, Internet and various optical applications. The long-period fiber grating has been proved to be a useful optical component for source stabilization, strain gauges, and selective filters. This research develops an enhanced production method and studies the characteristics of long-period fiber gratings. A low power, dual band 325/442 nm, continuous wave He-Cd laser, substituting the conventional high power excimer laser with 248 nm, is employed as a light-source. Fiber gratings were fabricated ”point by point” using a computer-controlled process. Various long-period fiber gratings were produced with different exposure times and grating lengths. The transmittance spectra of the gratings were acquired by illuminating white light source. The derivation of the theory coincides with the spectra.

並列關鍵字

Fiber grating ； He-Cd laser ； point-by-point method