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We have developed a system for producing amplified pulses offrequency-chirped light at 780 nm on nanosecond timescales. The system startswith tunable cw laser light and employs a pair of fiber-based phase modulators,a semiconductor optical amplifier, and a tapered amplifier to achieve chirprates exceeding 3 GHz/10 ns and peak powers greater than 1 W. Driving themodulators with an arbitrary waveform generator enables arbitrary chirp shapes,such as two-frequency linear chirps. We overcome the optical power limitationsof the modulators by duty cycling and avoid unseeded operation of the taperedamplifier by multiplexing the chirped pulses with "dummy" light from a separatediode laser.

Amplification of arbitrary frequency chirps of pulsed light on nanosecond timescales