本論文研究被動式Q開關鉺鐿共摻光纖雷射，使用環型和線型兩種共振腔架構的光纖雷射，在脈衝產生的機制上使用被動式Q開關。
實驗中將使用鉺鐿共摻光纖做為增益介質及飽和吸收體，並改變不同長度的鉺鐿共摻光纖、不同反射率的光纖光柵，對雷射特性進行量測。也觀察泵激光源功率對脈衝寬度、重複率、平均輸出功率等特性的影響。另外，加入模場轉換元件來改善架構，使雙纖殼結構的鉺鐿共摻光纖能與單模光纖元件互相匹配，以減少損耗，雷射特性可以得到大幅改善。
實驗結果顯示，在泵激功率低時，於環型及線型雷射中都能觀察到鉺鐿共摻光纖的自調Q開關現象。另外，當使用的飽和吸收體長度較長時，脈衝重複率及平均輸出功率皆會降低，而將泵激光源功率提高時，脈衝重複率會隨之提高，此時，若使用長度較短的飽和吸收體，有可能無法產生Q開關現象，雷射輸出將回到連續波模式。最後，使用環型架構，可以獲得脈衝重複率、脈衝寬度及尖峰功率分別為61.73 kHz、2.60 μs及1.58 kW的輸出；使用線型架構，可以獲得脈衝重複率、脈衝寬度及尖峰功率分別為65.79 kHz、2.21 μs及2.48 kW的輸出。

In the thesis, the passively Q-switched Er-Yb co-dopoed fiber laser, both in ring cavity and linear cavity configurations, were designed and implemented.
The laser system was configured by using Er-Yb co-doped fiber as gain medium as well as saturable absorber. Several experiments were demonstrated by varying the parameters of fiber components inside the fiber lasers. The parameters to be adjusted including Er-Yb codoped fiber length and FBG reflectivity. The impacts of pumping power to pulse width, repetition rate and average laser output power were also investigated. We also inserted a mode filed adaptor in between the Er-Yb co-dopoed fiber laser and single mode fiber to reduce the modes convert loss and enhance the laser characteristics.
The experimental results indicated that at low pumping power, both ring and linear cavities fiber lasers have self-Q-switched pulse output. Also, the pulse repetition rate and average output power may decrease when the pump saturable absorber increase. Beside, the pulse repetition rate may decrease when the pump power increase. Too short of saturable absorber may result in continuous wave rather than Q-switched laser. With appropriate parameters adjustment, the ring cavity laser has Q-switched pulse repetition rate of 61.73 kHz, pulse width of 2.60 μs and peak power of 1.58 kW, individually. For liner cavity laser has Q-switched pulses repetition rate of 65.79 kHz, pulse width of 2.21 μs and peak power of 2.48 kW, individually.

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