High-repetition-rate coherent femtosecond pulse amplification with an external passive optical cavity.
We demonstrate a general technique for enhancement of femtosecond pulses from a pulse train through their coherent buildup inside a high-finesse cavity. Periodic extraction of the intracavity pulse by means of a fast switch provides a net energy gain of 42 to >70 times for 38-58-fs pulse durations. Starting with an actively stabilized but otherwise standard mode-locked laser system, we demonstrate pulses of >200-nJ energy.
Jones
R Jason
RJ
JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Boulder, Colorado 80309-0440, USA. rjjones@jilau1.colorado.edu
Ye
Jun
J