全固光子带隙光纤滤波1126nm掺镱光纤激光器

1126 nm ytterbium-doped fiber laser combining all-solid photonic bandgap fiber

利用全固光子带隙光纤(all-solid photonic bandgap fiber,AS-PBGF),以及光纤光栅对组成谐振腔强制选频,得到输出波长为1 126 nm、输出功率为1.81 mW的全光纤化掺镱光纤移频激光器.AS-PB-GF的禁带介于1 030～1 124 nm,恰好可压制掺镱光纤的常规强增益波段.介于禁带范围的放大自发辐射得到很好压制,输出激光高于残余辐射近50 dB.

Although the ytterbium-doped fiber has large emitting spectral region,the conventional ytterbium-doped fiber laser usually operates at around 1 060 nm.However,it is of significance to build a frequency-shifted laser operating at a novel wavelength.In our frequency-shifted fiber laser cavity,we introduced an all-solid photonic bandgap fiber with a forbidden gap between 1 030-1 124 nm as filter and a pair of fiber Bragg gratings at 1 126 nm as reflector,and achieved an lasing output at 1 126 nm.The output power was 1.81 mW.Due to a strong suppression between 1 030-1 124 nm,the lasing signal was about 50 dB higher than the amplified spontaneous emission.