臺灣博碩士論文加值系統

我們利用一內徑為700 μm、長度1 m的中空矽光纖作為氣體吸收室，中心波長為1520.25 nm的DFB雷射二極體作為光源，來觀測乙炔氣體吸收波長在1520.08 nm的ν1+ν3 譜帶R(9)飽和吸收光譜。由於該譜線飽和吸收光譜譜線甚窄約數MHz，且需要足夠的光強度，才可觀測到飽和吸收訊號，因此我們利用中空光纖對光容易、可使光束保持長距離的高光強度的優點來作為氣體吸收室。而且對此架構而言，可保持泵浦光束與探測光束的長距離重合度，增加有效的飽和吸收探測長度，故可提高飽和吸收訊號。

In this thesis, a 1.52 mm butterfly laser diode of 10mW output and a hollow fiber of 100 cm long with inner diameter of 700 mm, which have a Brewster window on one end to avoid interference effect, was used to investigate the saturated absorption spectrum of acetylene R(9) line of ν1+ν3 band . The laser beam was separated into pump beam and probe beam which counter-directed into a hollow fiber absorption cell filled with C2H2 gas. The hollow fiber can use as an absorption cell because hollow fiber can keep the laser beam in high intensity as well as the overlap of the pump and the probe beam for a sufficient long distance .

摘要 i
Abstract ii
致謝 iii
章節目錄 iv
圖表目錄 vi
第一章 序論 1
1.1 實驗目的 1
1.2 中空光纖簡介 2
1.3 乙炔分子光譜簡介 3
第二章 原理 7
2.1 飽和吸收光譜 7
2.1.1 燒洞效應(Hole burning) 8
2.1.2藍姆凹陷(Lamp Dip) 12
2.1.3 氣壓增寬與氣壓偏移 14
2.2 頻率調制 17
2.3 中空矽光纖光傳播原理 20
第三章 實驗架構 23
3.1實驗室以往的結果與改進方法 23
3.2雷射頻率調制深度的量測-DSH系統 25
3.3 真空系統 27
3.4 飽和吸收光譜架構 29
3.4.1飽和吸收架構光路簡介 29
3.4.2 中空光纖吸收室 31
3.4.3 頻率調制 32
第四章 實驗結果 33
4.1 雷射特性量測 34
4.2 頻率調制深度量測 34
4.3 吸收光譜量測結果 37
4.3.1 單趟吸收 38
4.3.2 飽和吸收光譜量測 40
第五章 結論與未來展望 44
5.1 結論 45
5.2 未來展望 46
參考資料 48

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