We demonstrate passively mode-locked erbium/thulium doped fiber lasers (TDFLs) operating at 1560/1950 nm by using a common gold nanorods (GNRs)/D-shaped fiber as saturable absorber (SA). The SA is prepared by the composite of GNRs with an average aspect ratio of 5.3 and D-shaped fiber, which has broadband absorption from 1000 nm to 3000 nm. By inserting the same SA into an erbium or thulium doped fiber laser cavity, stable passively mode-locked laser at 1560 or 1950 nm is achieved, respectively. A 1560 nm laser with a pulse width of 590 fs and a repetition frequency of 25.72 MHz is obtained for the erbium doped fiber laser (EDFL), and a 1950 nm laser with a pulse width of 373 fs and a repetition rate of 27.66 MHz is also obtained for the TDFL. Our results show that the GNRs/D-shaped fiber SA could be used for constructing broadband femtosecond fiber lasers.

我们通过使用常见的金纳米棒（GNR）/ D形光纤作为可饱和吸收体（SA），演示了在1560/1950 nm处工作的无源锁模掺// th光纤激光器（TDFL）。SA是由平均纵横比为5.3的GNR和D形纤维复合而成的，D形纤维的宽带吸收范围为1000 nm至3000 nm。通过将相同的SA插入掺or或掺fiber的光纤激光器腔中，分别获得了稳定的1560或1950 nm的被动锁模激光器。掺do光纤激光器（EDFL）的脉冲宽度为590 fs的1560 nm激光器，重复频率为25.72 MHz，而脉冲宽度为373 fs的重复频率为27.66 MHz的1950 nm激光器的重复频率为25.72 MHz。也为TDFL获得。