本論文使用兼具Q與增益被動式雙切換的機制，在掺鐿的全光纖系統中製作出波長976 nm以及1064 nm脈衝雷射。主要可分為兩個部分，首先探討如何使用被動式Q切換的方式產生976 nm脈衝雷射。第二部份再利用脈衝產生後作為976 nm的可飽和吸收體即為1064 nm的增益介質，進而增益切換出1064 nm脈衝雷射，因此本論文所設計的全光纖式實驗架構可產生一個自我平衡的雙脈衝雷射系統。經過實驗證實後，在使用輸入功率110 mW的915 nm雷射二極體作為激發光源，即可產生脈衝能量為1.5 μJ、重複率2 kHz、脈衝寬度約275 ns、最高脈衝功率峰值5.45 W的976 nm雷射。並且由此實驗證實，根據鐿原子在0.97~1.12 μm的放射頻譜，只要配對上適當波長的共振腔，皆可使用兼具被動式Q切換與增益切換的機制，來產生波長範圍於0.97~1.12 μm內各個波段的脈衝雷射。

The purpose of the study is to produce a passively pulsed Yb3+ all-fiber laser that self-balances between being Q-switched at 0.97-0.98 μm and being gain-switched at 1-1.12 μm, using a continuous-wave 915 nm pump laser diode. The device was experimentally demonstrated at 976 nm of Q-switching, and 1064 nm of gain switching. With pump power of 110 mW, a single-mode Q-switched pulse at 976 nm with pulse energy of 1.5 μJ and pulse duration of 275 ns was achieved. Furthermore, the rate equations to simulate the interactions between the dual-wavelength photons and the populations of the ytterbium gain and absorber fibers were established. With desirable fiber Bragg gratings, a CW-pumped Yb3+ laser can produce sequential pulses in the ytterbium emission band of 0.97-1.12 μm.

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