中文摘要：

近年来随着对单频光纤激光器和放大器研究的不断深入,得到了越来越高的输出功率,由于单频光纤激光器、放大器的输出功率在很大程度上受限于受激布里渊散射（SBS）效应,故需要研究SBS效应的影响因素和抑制方法。利用铥离子（Tm3＋）的速率方程和SBS效应下双包层光纤放大器的速率方程,建立了单频光纤放大器的理论模型,计算得到了掺铥光纤放大器的能量分布和输出功率,并讨论了光纤长度、抽运功率、Tm3＋掺杂浓度、增益光纤内温度分布等因素对单频光纤放大器中SBS效应和输出功率的影响,总结了在提高放大器输出功率的同时有效抑制SBS效应的方法。自行搭建了全光纤掺铥光纤种子光源及放大器,高稳定性的全光纤掺铥激光种子光的中心波长为1941 nm,信噪比约为60 d B。当掺铥放大器的抽运功率达到2.15 W时,激光的输出功率可以达到0.766 W。

英文摘要：

With the development of study on single-frequency fiber laser and amplifier, higher output power can be received. Because stimulated Brillouin scattering （SBS） effect has a great constrain on output power of single-frequency fiber laser and amplifier, so the study of infuence factor and suppression method of SBS is necessary. Based on the rate equations of thulium （Tm3＋） ions and double-cladding fiber amplifier with SBS, a theoretical model of the single-frequency fiber amplifier is created, and the energy distribution and output power of the Tm3＋- doped fiber amplifiers are calculated. Then the effects of fiber length, pump power, Tm3＋ doped concentration on output power and SBS effect of the single- frequency fiber amplifiers are discussed. Finally, it can be concluded that how to improve the output power of the fiber amplifiers and effectively suppress the SBS effect at the same time. A all-fiber Tm3＋- doped fiber amplifier is presented. The center wavelength of the Tm3＋-doped fiber laser is 1941 nm. The signal to noise ratio is 60 dB. When the pump power of the Tm3＋-doped fiber amplifier is 2.15 W, the maximum output power is 0.766 W.