Stretcherless, Femtosecond mJ Fiber Amplifier with Coherent Pulse Stacking

KMLabs will construct a stretcher-less mJ-class ultra-short pulsed laser system at repetition rates in excess of 20 kHz. Our proposed laser system combines coherent pulse stacking technology developed at the University of Michigan by Prof. A. Galvanauskas with KMLabs’ stretcher-less fiber amplification technology. Using a GHz class fiber oscillator and frequency comb stabilization techniques, we will pulse stack a burst of pulses containing 1 mJ of energy in a cascade of Gires-Tournois Interferometer cavities. Following the pulse stacker, a small footprint grating compressor, roughly the size of a deck of cards, will de-chirp the pulse to below 200 fs, achieving 3.5 GW of peak power.