Abstract
We report a self-starting passively mode-locked thulium-doped silica fiber laser capable of 190-fs pulses. The mode-locked fiber laser is illustrated conceptually in Fig. 1. The pump laser was a passively cooled 50-mW single-frequency diode laser emitting near 786 nm with an attached microlens for circularizing the emission. The diode laser and two Coming asphere lenses for focusing into the fiber core were contained in a commercial package, which provided rigid support and alignment capability and allowed achievement of an estimated 80% coupling efficiency. The silica fiber, fabricated by MCVD, had the central 25% of the core area thulium-doped to 19000 ppm to allow low-threshold pumping. The fiber had a numerical aperture of 0.37, cutoff wavelength of 1.37 μm, core diameter of 2.8 μm, 3F4 fluorescence lifetime of 1 ms, and a small signal-absorption coefficient of 0.5 dB/cm at 786 nm.
© 1996 Optical Society of America
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