Abstract
We report broad tunability of a femtosecond (fs) diode-pumped Cr:LiSAF laser mode-locked with a broadband saturable Bragg reflector (SBR). The SBR had seven pairs of AlxOy(n∼1.5) and Al0.17Ga0.83As(n∼3.5) layers in its Bragg stack, enabling a 250nm reflectivity bandwidth around 850nm. A 6-nm-thick strained In0.15Ga0.85As quantum well placed between Al0.17Ga0.83As cladding layers was used as a broadband saturable absorber in the 800-920nm wavelength range. The laser was pumped by 6 single mode diodes-four at 640 nn and two at 660nm. Mode locking was self-starting and fs pulses could be continuously tuned from 800nm to 905nm by an intracavity birefringent filter with an out-of-plane optic axis. The pulse widths varied from 70fs to 255fs as the laser was tuned. The laser had an 85.5MHz repetition rate and the output power varied from 80mW to 180mW with tuning.
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