全光纤自调Q双包层Er-Yb共掺光纤环形激光器

An all fiber self-Q-switched Er-Yb co-doped double-cladding fiber ring laser

报道了一种结构紧凑的自调Q双包层Er-Yb共掺光纤（EYDF）环形激光器。利用双包层EYDF同时作为增益光纤和可饱和吸收体，光纤光栅（FBG）作为波长选择器，实现了中心波长1539．80nm的稳定自调Q脉冲输出。自调Q运转可在泵浦功率376～1＇208mW的较大范围内获得，调Q重复频率从7．40kHz到64．2kHz连续可调谐。自调Q最短脉冲宽度为1．8μs，最大单脉冲能量为1．65μJ，最大平均输出功率为81．3mW，调Q脉冲的频谱信噪比（SNR）最高可达60dB。

A compact self-Q-switched erbium/ytterbium co-doped double-cladding fiber （EYDF） ring la- ser is demonstrated. Using an EYDF as both the gain fiber and saturable absorber,a fiber Bragg grating （FBG） as the wavelength-selective element, the laser can operate at the status of stable self-Q-switching with the central wavelength of 1539.80 nm and narrow linewidth of 0. 07 nm. The self-Q-switching op- eration can keep in a wide pump power range from 376 mW to 1 208 mW. As the pump power increas- ing,the pulse repetition rate can be continuously tuned from 7.40 kHz to 64. 2 kHz. When the pump power reaches 1208 mW,the largest pulse repetition rate of 64. 2 kHz can be achieved. The largest aver- age output power of 81.3 mW is obtained from the 90% port of the optic coupler. The shortest pulse du- ration and the largest single pulse energy of the Q-switched laser are 1.8μs and 1.65 μJ, respectively. The self-Q-switching operation is stable with the radio-frequency signal-to-noise ratio （SNR） of more than 60 dB.