掺铥光纤可饱和吸收特性模拟与分析

摘要

A theoretical model concerning the saturable absorption characteristics of Tm-doped fiber at 1 550 nm is presented.Investigations on the related energy transition proces-ses are conducted,and the passively Q-switched mechanism related to the 3 H 6→3 F4 energy transition process is described.Numerical results show that,with 100 mW 980 nm laser pumped,the Er-doped fiber laser can operate at repetition rate of 26.9 kHz,indicating that high repetition rate Q-switched operation of Er-doped fiber lasers will achieve with Tm-doped fiber saturable absorber.%对掺铥光纤在1550 nm波段的可饱和吸收特性进行了理论模拟。通过对铒离子和铥离子与饱和吸收特性相关的能级跃迁过程的研究，描述了铥离子的3H6→3F4能级跃迁的被动调Q机理。在100 mW，980 nm 激光器泵浦下，掺铒光纤激光器被动调Q重频为26．9 kHz，表明使用掺铥光纤作为可饱和吸收体，可以实现对掺铒光纤激光器的高重频调Q。