Generation of femtosecond light pulses in the near infrared around λ = 850 nm

Femtosecond light pulses tunable between 840 nm and 880 nm are
generated in a synchronously pumped ring dye laser. The laser emits
nearly bandwidth-limited pulses (Δv tp = 0.45) with pulse durations
down to 65 fs. At a pumping power of 450 mW of a mode-locked Ar-ion
laser (λ = 514 nm) the infrared femtosecond dye laser has an output
of up to 15 mW.