Low-Noise Operation of All-Fiber Femtosecond Cherenkov Laser

Xiaomin Liu, Guillermo Eduardo Villanueva Ibáñez, Jesper Lægsgaard, Uffe Visbech Møller, Haohua Tu, Stephen A. Boppart, Dmitry Turchinovich

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    We investigate the noise properties of a femtosecond all-fiber Cherenkov radiation source with emission wavelength around 600 nm, based on an Yb-fiber laser and a highly-nonlinear photonic crystal fiber. A relative intensity noise as low as - 103 dBc/Hz, corresponding to 2.48 % pulse-to-pulse fluctuation in energy, was observed at the Cherenkov radiation output power of 4.3 mW, or 150 pJ pulse energy. This pulse-to-pulse fluctuation is at least 10.6 dB lower compared to spectrally-sliced supercontinuum sources traditionally used for ultrafast fiberbased generation at visible wavelengths. Low noise makes allfiber Cherenkov sources promising for biophotonics applications such as multi-photon microscopy, where minimum pulse-to-pulse energy fluctuation is required. We present the dependency of the noise figure on both the Cherenkov radiation output power and its spectrum.
    Original languageEnglish
    JournalI E E E Photonics Technology Letters
    Issue number9
    Pages (from-to)892-895
    Publication statusPublished - 2013

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    • Fiber lasers
    • Laser noise
    • Noise measurement
    • Ultrafast optics


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