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首页> 外文期刊>Optical fiber technology >An 8 cm long holmium-doped fiber saturable absorber for Q-switched fiber laser generation at 2-μm region
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An 8 cm long holmium-doped fiber saturable absorber for Q-switched fiber laser generation at 2-μm region

机译：8 cm长的掺ped光纤可饱和吸收器，用于在2μm范围内产生Q开关光纤激光器

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摘要

We demonstrate a Q-switched all-fiber laser operating at 2-mu m region by adding a piece of 8 cm long holmium doped fiber (HDF) as a fiber saturable absorber (SA) in Thulium doped fiber laser (TDFL) ring cavity. Doping of Ho ions into yttria-alumina silica glass was done through conventional Modified Chemical Vapor Deposition (MCVD) technique in conjunction with solution doping process. The fabricated HDF has a linear absorption of 3 dB with a core diameter and a numerical aperture of 10 mu m and 0.18, respectively. A self-started Q-switching operation begins at 418 mW pump level and continually dominant until 564 mW pump level. As the pump power increases, stable pulse train presence from 30.61 kHz to 38.89 kHz while the pulse width reduces from 3.18 mu s to 2.27 mu s. Both maximum output power and maximum peak power are obtained at 5.05 mW and 57.2 mW, respectively, while the maximum pulse energy is calculated to be 129 nJ. The signal-to-noise ratio (SNR) of the fundamental frequency is 50 dB. Our work may contribute to the discovery of stable, robust, and economic SA for pulse fiber laser generation at 2-mu m region.
机译：我们通过在a掺杂光纤激光器（TDFL）环形腔中添加一块8厘米长的do掺杂光纤（HDF）作为光纤可饱和吸收剂（SA），演示了在2微米区域工作的Q开关全光纤激光器。通过常规的改良化学气相沉积（MCVD）技术结合溶液掺杂工艺，将Ho离子掺杂到氧化钇-氧化铝二氧化硅玻璃中。制成的HDF具有3 dB的线性吸收，芯直径和数值孔径分别为10μm和0.18。自启动的Q开关操作以418 mW的泵浦水平开始，并持续占主导地位，直到564 mW的泵浦水平。随着泵浦功率的增加，稳定的脉冲序列从30.61 kHz到38.89 kHz，而脉冲宽度从3.18μs减小到2.27μs。最大输出功率和最大峰值功率分别为5.05 mW和57.2 mW，而最大脉冲能量经计算为129 nJ。基本频率的信噪比（SNR）为50 dB。我们的工作可能有助于发现稳定，坚固且经济的SA，以在2微米区域产生脉冲光纤激光器。

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