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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。
In recent years, with the continuous research of single-frequency fiber laser and amplifier, higher and higher output power has been obtained. Due to the single-frequency fiber laser, the output power of the amplifier is largely limited by stimulated Brillouin scattering (SBS) effect, it is necessary to study the impact of SBS effects and suppression methods. Based on the rate equation of Tm3 + and the rate equation of double-clad fiber amplifier under the SBS effect, a theoretical model of the single-frequency fiber amplifier is established. The energy distribution and output power of the hybrid fiber amplifier are calculated. Length, pumping power, Tm3 + doping concentration and gain fiber temperature distribution on the SBS effect and output power in a single-frequency fiber amplifier, the methods to effectively suppress the SBS effect while increasing the output power of the amplifier are summarized. The all-fiber doped 铥 fiber seed light source and amplifier are built by themselves. The center wavelength of the high stability all-fiber doped 铥 laser seed light is 1941 nm, and the signal-to-noise ratio is about 60 dB. When the pumping amplifier reaches a pumping power of 2.15 W, the output power of the laser can reach 0.766 W.