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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/58858
標題: | 利用超低傳輸損耗的微光纖製作具有高品質因素的兩層微光纖線圈共振腔 Fabrication of Two-layer Microcoil Resonators with Very High Quality Factors by Using Ultra-low Propagation Loss Microfibers |
作者: | Tsung-Han Shen 沈宗翰 |
指導教授: | 王倫(Lon A. Wang) |
關鍵字: | 微光纖,低損耗,光纖抽絲塔,線圈共振腔,高品質因素, Microfiber,Low Loss,Fiber Drawing Tower,Microfiber Coil Resonators,High Quality Factor, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 在本論文中,首先我們介紹了改良的小型化光纖拉絲塔。使用氫氧焰做為熱源,提供了足夠高的溫度來進行光纖拉絲,並透過壓克力罩來減少空氣擾動和污染。在幾組氣體流量控制閥的調節下,嚴格地控制氫氧焰的氣體流量,也確保了熱源穩定的輸定。藉由環境和熱源的穩定,我們成功將直徑2微米微光纖的傳輸損耗降低為0.0015 dB/cm,大大減少了抽絲過程中微光纖錐體結構的變形曲折,這種變形曲折會使微光纖損耗大量增加,是製作超低損耗的微光纖所不願見到的。改良後的微光纖在10.5毫米的長度內,最大的直徑變化量(△D)約為10 nm,其△D/L∼1×10-6,可媲美甚至優於世界上其他團隊的記錄。此外改良後的微光纖的半徑的相對變化∼5×10-4/毫米,這是目前在世界上的最佳記錄。如此的相對變化量其數量級幾乎和傳統的單模光纖相同。此外,我們運用了田口玄一法分析了在微光纖拉絲實驗中各參數的影響,發現在將微光纖抽細的實驗中,抽絲時間是影響最顯著的參數。
接下來,我們展示許多微光纖線圈共振腔的實驗架構。透過具有超長工作距離的物鏡和CCD感光元件的使用,我們可以動態觀測繞線的整個過程。即時觀測有助於在繞線過程中儘早檢測出錯誤。此外,因為繞線系統具有良好的同心度和穩定性,使我們能夠確實地操控微光纖線圈共振腔上的微光纖,並準確地控制微光纖線圈共振腔上每圈之間的間隙。 本篇論文提出一種新型小型化的二層結構微光纖線圈共振腔。利用直徑3微米的微光纖繞在一個直徑1.8毫米毛細管上做成的二層結構三圈的微光纖線圈共振腔,其品質因數高達1,180,000。這種小型化的二層結構微光纖線圈共振腔具有極高的品質因素。可以在光纖感測和非線性光學領域找到有用的應用。 In the beginning, a modified miniature fiber drawing tower is introduced. Hydrogen oxygen flame, a clean heat source, provided sufficiently high temperature needed for silica fiber drawing. We used a Plexiglas box to reduce the air turbulence and the contamination such as particles in the air and several sets of regulators to ensure the constant gas flow rates for uniform heating during the drawing process. These improvements successfully resulted in low-loss microfibers, ~ 0.0015 dB/cm for 2-μm-diameter microfibers and the bending of microfiber tapers was greatly reduced. The maximum diameter variation (△D) was about 10 nm over the 10.5 mm length (L) of the microfiber, leading to △D/L~1x10-6, comparable or even better than the records shown by other groups in the world. The relative variation of the microfiber radius was ~ 5x10-4 per mm, the best record ever reported for microfibers. Such a small variation of microfibers was nearly the same order of magnitude with regular single mode fibers. Besides, the influences of the process factors in fiber drawing were analyzed by using the Taguchi method, which concluded that the effect of drawing time was the most significant one. Next, we show a lot of experimental setups for making MCRs. Due to the use of an ultra-long working distance objective and a CCD, we could dynamically observe the coiling process without re-focusing and record the images by video shooting. The capability of real-time observation helped us early detect the faults during coiling process. Besides, the coiling system achieved good concentricity and stability because the deviation from center point was less than 1 μm. We were able to manipulate the microfibers of the MCRs arbitrarily and control the gap accurately. A novel and compact resonator with high-quality factor based on a two-layer microcoil resonator has been demonstrated in this thesis. For a two-layer MCR made from 3-μm diameter microfiber around a 1.8-mm diameter silica rod, a quality factor as high as 1,180,000 could be obtained by just only 3 turns. Such a miniature MCR with high Q-factor may find useful applications in optical fiber sensing and nonlinear optics. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/58858 |
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顯示於系所單位: | 光電工程學研究所 |
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