A tapered-silica fiber has recently been used in producing an ultra-broad band spectrum.1 By heating and stretching a 10-mm silica fiber with a 125-um outer diameter and a 9-um core diameter, a 70-mm totally long tapered fiber was produced with a 25-mm long waist of 2-um uniform diameter. Pulses from a mode-locked Ti:sapphire laser (100-MHz repetition rate, ~ 150-fs pulse width, 295-mW average power, and 790-nm center wavelength) were focused into the fiber. A typical resultant ultra-broad band spectrum was found to range from 425 to 955 nm.

© 2002 Optical Society of America

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