本論文利用數值模擬的方法研究高功率脈衝雷射中，在已經抑制受激 拉曼散射(stimulated Raman scattering)的情況下，研究窄線寬脈衝下受激布里淵散射(stimulated Brillouin scattering)對於最大可擷取能量的影響。 在此數值研究中，我們建構了包含受激拉曼散射與受激布里淵散射的 一維速率-傳輸方程式(rate-propagation equation)的數值模型，以模擬的方式，發現在脈衝線寬為 0.02 奈米的情況下，即使抑制了受激拉曼散射，仍然會有部分的能量轉移到受激布里淵散射上。對於需要使用窄線寬脈衝的實驗而言，所輸出的能量勢必受到受激布里淵效應的影響，本論文給出了在脈衝線寬為 0.02 奈米的情況下，改變脈衝重複率與光纖長度所得到的最大可擷取能量，並得出不同脈衝線寬下，以改變光纖長度抑制受激布里淵散射的最大可擷取能量。 此研究呈現了高功率光纖雷射脈衝放大器最佳化的量化參數條件。研 究結果可直接用在實驗上設計且優化高功率、高能量脈衝光纖雷射放大器。另一方面，此光纖雷射脈衝放大器數值模型，未來可進一步加入多橫模及其他不同的非線性效應，用於研究光纖中能量頻譜展寬的研究。;A numerical study of maximum extractable energy from high power pulsed fiber laser amplifier with considerations of stimulated Raman scattering(SRS) and stimulated Brillouin scattering(SBS) is presented. Based on rate-propagation equations, a one-dimensional convection code is constructed for calculating the maximum extractable energy in fiber laser amplifiers. In the thesis, we extended the numerical model, which is based on rate-propagation equation, to study the maximum extractable energy in fiber laser amplifiers. Simulation results show that even the SRS is suppressed, A part of energy turns into SBS when linewidth of signal is 0.02 nm. For those experiments need to fix linewidth of signal, the output energy must be affected by SBS. We get the maximum extractable energy by changing repetition rate of signal and fiber length with 0.02 nm linewidth of signal, and get maximum extractable energy in different linewidth of signal. The numerical model used in the study can be applied to study the nonlinear effects and the spectral broadening in high power pulsed fiber laser amplifier and provide experimental designs of a practical high-power and high-energy pulsed fiber amplifier.
