Ultra_flat.pdf (623.27 kB)
Download fileAn ultra-flat, low-noise and linearly polarized fiber supercontinuum source covering 670 nm-1390 nm
We
report an octave-spanning coherent supercontinuum (SC) fiber laser with
excellentnoise and polarization properties. This was achieved by pumping a
highly birefringent all-normaldispersion (ANDi) photonic crystal fiber with a
compact high-power ytterbium femtosecond laserat 1049 nm. This system generates
an ultra-flat SC spectrum from 670 nm to 1390 nm with apower spectral density
higher than 0.4 mW/nm and a polarization extinction ratio of 17 dB acrossthe
entire bandwidth. An average pulse-to-pulse relative intensity noise (RIN) down
to 0.54%from 700 nm to 1100 nm has been measured and found to be in good
agreement with numericalsimulations. This highly-stable broadband source could
find strong potential applications inbiomedical imaging and spectroscopy where
improved signal to noise ratio is essential.