臺灣博碩士論文加值系統

在光纖雷射發展中，脈衝雷射是使峰值功率提高的方式之一，且在細微的工業加工上或是醫療上，皆需使用較窄的脈衝雷射，因此如何壓縮脈衝為脈衝雷射的一個重要的研究方向。 在雷射中的增益介質是決定產生雷射後波長的因素，目前常見在光纖雷射使用的增益離子為鐿離子、鉺離子、銩離子及鈥離子，雖然每種離子都有很大的增益頻寬，但因雷射光為窄頻的光源，不易於檢測上需不同頻率的光源，因此有超連續光譜的產生，其中鎖模雷射因脈衝寬度縮短至皮秒甚至飛秒等級，使得峰值功率相當的強，藉由高強度的峰值功率以自相位調變及其他的非線性效應使頻寬拓寬。 本論文中使用摻鐿離子加聲光調變器的主動式Q開關雷射，利用改變外加控制器的參數來達到脈衝壓縮的結果。在2μm的超連續光譜研究上，我們使用市售的摻銩離子鎖模雷射，以此作為種子光源與自製的錐形光纖進行輸出光譜特性的研究。

Along the development of optical fiber laser, pulsed laser system is one way to enhance the laser peak power. A high peak power laser with narrow pulses is required in micro-machinery and medical applications. Therefore, how to compress the laser pulse is an important research direction in the field of pulsed fiber laser. In general, the gain fiber determines the laser output wavelength. At present, the active ions used in the fiber laser are ytterbium, erbium, thulium and Holmium. Although these ions have large emission bandwidths, available fiber laser sources tend to exhibit relatively narrow linewidths. On the other hand, supercontinuum laser source can further extend the laser application scope, which is mostly limited by the laser narrow linewidth. Mode-locked fiber lasers with kW-level peak powers as well as the ultrashort pulse widths are good sources for supercontinuum generation. The high peak power can broaden the bandwidth of mode-locked lasers source through Stimulated Raman scattering, Self-phase modulator, and other nonlinear effects. In this work, we optimize the operating parameters of the acousto-optic modulator to compress the output pulses of the Q-switched Yb3+ doped fiber laser. In addition, we have investigated the spectrum modulation property of a homemade fiber taper in a commercial Tm3+ doped mode-locked fiber laser.

摘要 I ABSTRACT III 致謝 V 目錄 VI 表目錄 VIII 圖目錄 IX 第一章 緒論與研究動機 1 1.1前言 1 1.2研究動機 2 1.3論文架構 2 第二章 光纖雷射廣論 3 2.1光纖雷射機制 3 2.1-1雷射幫浦光源 4 2.1-1-1纖心幫浦機制 5 2.1-1-2纖衣幫浦機制 6 2.1-2雷射增益介質 8 2.1-3雷射共振腔 9 2.2 Q開關光纖雷射機制 12 2.3鎖模光纖雷射之原理 14 2.4超短脈衝量測 18 2.4-1 自相關儀量測與操作 19 第三章 非線性光學 22 3.1散射(SCATTERING) 23 3.1-1-1受激布里淵散射(Stimulated Brillouin scattering，SBS) 24 3.1-1-2受激拉曼散射(Stimulated Raman scattering，SRS) 25 3.2自相位調變(SELF-PHASE MODULATOR，SPM) 27 3.3色散(DISPERSION) 28 3.3-1模態色散(Modal dispersion) 29 3.3-2材料色散(Material dispersion) 30 3.3-3波導色散(Waveguide dispersion) 31 3.3-4極化模態色散(Polarization dispersion) 33 第四章 聲光調變Q開關雷射之實驗 34 4.1 聲光調變Q開關雷射系統架設 34 4.2調變AOM訊號之不同重複頻率 36 4.3改變開啟時間 39 4.4縮短腔長 40 第五章 2ΜM鎖模雷射超連續光譜之實驗 42 5.1錐形光纖製作 42 5.2 2ΜM飛秒雷射超連續光譜實驗 43 5.2-1飛秒雷射架設 43 5.2-2錐形光纖之光學特性量測 47 第六章 結論與未來展望 55 6.1實驗結果統整 55 6.2未來展望 55 參考文獻 58

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