本論文將針對一個飽和吸收Q和增益雙切換之Er3+-Tm3+全光纖雷射系統來進行模擬與分析。此雷射系統的結構是以一個1550 nm飽和吸收Q切換全光纖掺鉺雷射中的掺銩Q切換材料作為1950 nm增益切換脈衝雷射的增益材料來完成雙波長光子脈衝雷射系統。文中有推導出一組雙波長光子微分方程式可以用來模擬分析在雙波長光子脈衝雷射系統內的雙波長光子、增益居量及吸收居量的相互關係，並探討模態面積不匹配、SAQS可飽和吸收初始值、FBG輸出反射率及其他光子波長設計下對雙波長光子脈衝雷射系統輸出特性的影響。

The purpose of the study is to simulate and analyze a novel saturable-absorber Q-and gain-switched Er3+-Tm3+ all-fiber laser system. The dual-wavelength pulsed all-fiber laser system is a passively Q-switched erbium laser at 1550 nm using thulium doped saturable-absorber fibers that is also the gain medium of an intra-cavity gain-switched laser at 1950 nm.. A set of rate equations is established to model the interaction between the photons of two wavelengths and the populations of the gain and the absorber fibers. The effects of the factors as the mode field area ratio, initial SAQS absorption loss, output coupler loss and designated emission wavelengths on the system performances are analyzed and discussed.

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