An all-optical tunable microlaser based on the ultrahigh-quality (Q)-factor erbium-doped hybrid microbottle cavity is proposed and experimentally demonstrated for the first time. All-optical wavelength tunability of the silica microcavity laser is a very attractive feature and has been rarely reported. By using an improved doping method, the erbium-doped silica microbottle cavity with a Q factor of 5.2 × 10⁷ in the 1550 nm band is obtained, which is higher than the previous work based on the conventional sol–gel method. Through nonresonant pump in the 980 nm band, a lasing threshold of 1.65 mW is achieved, which is lower than all those realized through the same pump method. Besides, iron oxide nanoparticles are coated on the tapered area by doping them in the ultraviolet curing adhesive in order to precisely control the coating area, which enables the hybrid microcavity to maintain the ultrahigh Q factor and possess large tunability. By feeding the control light through the axial direction of the microbottle cavity, the lasing wavelength is all-optically tuned with a range of 4.4 nm, which is larger than the reported doped silica microcavity lasers. This work has great potential in applications such as optical communications, sensing, and spectroscopy.

中文翻译：

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基于超高Q掺Hybrid混合微瓶腔的全光可调微激光器

提出了一种基于超高质量（Q）因子掺hybrid混合微瓶腔的全光学可调谐微激光器，并首次进行了实验验证。二氧化硅微腔激光器的全光波长可调谐性是一个非常吸引人的功能，鲜有报道。通过使用改进的掺杂方法，Q值为5.2×10 ⁷的掺do二氧化硅微瓶腔获得了1550 nm波段的光，这比以前基于常规溶胶-凝胶法的工作要高。通过980 nm波段的非谐振泵浦，可实现1.65 mW的激射阈值，该阈值低于通过相同泵浦方法实现的所有激射阈值。此外，通过在紫外线固化型胶粘剂中掺杂氧化铁纳米颗粒，可以在锥形区域上涂覆氧化铁纳米颗粒，以精确控制涂覆区域，从而使混合微腔保持超高Q值。并具有较大的可调性。通过沿微瓶腔的轴向馈入控制光，激光波长将在4.4 nm的范围内进行全光调谐，该波长大于已报道的掺杂二氧化硅微腔激光器。这项工作在光通信，传感和光谱学等应用中具有巨大潜力。