We demonstrate a compact, all‐fiber Q‐switched hafnium bismuth erbium co‐doped fiber laser based on bismuth‐doped fiber (BDF) as the saturable absorber (SA). The laser cavity was constructed using a homemade hafnium bismuth erbium co‐doped fiber as gain medium. It was found that stable Q‐switched pulses operating at 1531.74 nm can be readily generated when the 980 nm pump power is raised above the threshold of 96 mW. By increasing the pump power to the maximum power of 198 mW, the repetition rate was tunable from 27.2 to 59.1 kHz while the pulse width reduces from 36.3 to 6.8 μs. At the maximum pump power, the Q‐switched laser produced a pulse energy of 10.1 nJ. The finding provides evidence of the possibility of BDF as an effective SA for Q‐switched laser operating in 1.5 μm region.

中文翻译：

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掺fiber光纤作为Q铋共掺光纤激光器中的Q开关

我们展示了一种基于铋掺杂光纤（BDF）作为可饱和吸收体（SA）的紧凑型全光纤Q开关ha铋铋共掺光纤激光器。激光腔是使用自制的掺b铋铋光纤作为增益介质构建的。已经发现，当将980 nm的泵浦功率提高到96 mW的阈值以上时，可以很容易地产生工作在1531.74 nm的稳定的Q开关脉冲。通过将泵浦功率增加到198 mW的最大功率，重复率可从27.2调整到59.1 kHz，而脉冲宽度从36.3减少到6.8μs。在最大泵浦功率下，调Q激光器产生的脉冲能量为10.1 nJ。这一发现提供了证据，证明BDF可能作为Q的有效SA。在1.5μm范围内操作的开关激光。