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A narrow linewidth laser operating at the telecommunications band combinedwith both fast and wide-band tuning features will have promising applications.Here, we demonstrate a single-mode (both transverse and longitude mode)continuous microlaser around 1535 nm based on a fiber Fabry-P\'erotmicrocavity, which achieves wide-band tuning without mode hopping to 1.3 THzrange and fast tuning rate to 60 kHz, yields a frequency scan rate of$1.6\times10^{17}$ Hz/s. Moreover, the linewidth of the laser is measured asnarrow as 3.1 MHz. As the microlaser combines all these features into one fibercomponent, it can serve as the seed laser for versatile applications in opticalcommunication, sensing, frequency-modulated continuous-wave radar and highresolution imaging.

Fast and wide-band tuning single-mode microlaser based on fiber Fabry-P\'erot microcavities