• 沒有找到結果。

腔體長度為 20.4 cm,782-nm 雷射輸出為少數階模態,線寬(FWHM)為 0.071 nm,

背向(輸入端)消光比為 11.55,背向與正向輸出的斜線效率分別為 1.36%和 4.92%,

雷射閥值為 421 mW,以 MATLAB 程式搭配雷射理論模型同時模擬正背向雷射表 現,得出光柵第一階繞射效率為 67%、第零階(正向輸出方向)效率為 12.4%。在 1525 mW 幫浦功率下,波長連續可調範圍為 719.56~910.42 nm,3-dB 頻寬為 72.9 nm。

本實驗室所使用的 KTN 晶體其光偏折能力為 0.5118 mrad/volt (0.029°/volt),

不同掃描頻率與雷射腔體架構有不同的適合的 DC 電壓值,適合 DC 電壓值約落於

然可達 161.2 nm 的可調頻寬。 為緩慢的 KTN-based 掃頻式摻鈦藍寶石晶體光纖雷射,使用 Fabry-Perot tunable filter 及延遲光纖(delay fiber)之環形雷射架構的頻域鎖模雷射(Fourier domain mode-locked laser)亦可作為 SS-OCT 之可調光源,該結構的掃頻頻率由環形共振腔 的單趟時間之倒數所決定,相對於傳統的掃描技術來說,該技術在每次調制波長 時,其雷射輸出不需每次由自發輻射而建立(built up),大大提升了掃描速度,而對 於相當寬頻的摻鈦藍寶石晶體相當適合使用於鎖模雷射技術。

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附錄一 KTN 偏折器之光學設計改良 為晶體光纖至 aspheric lens(f = 6.24 mm)、aspheric lens(f = 6.24 mm)至前面第一個補 償凹透鏡(f=-19 mm)、第一個補償凹透鏡至 KTN 晶體、KTN 晶體至第二個補償凹 透鏡(f=-19 mm)、補償凹透鏡至光腰(beam waist)的距離,f1為 aspheric lens 的焦距 (6.24 mm),f2為第一個補償凹透鏡的焦距(-19 mm),f3為第二個補償凹透鏡的焦距

[𝑟𝑥

表附錄 1-1 改良 KTN 偏折器參數表

附錄二 掃頻雷射模擬程式使用說明

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