Coherent Beam Combining of 37 Femtosecond Fiber Amplifiers

Programmable Orbital Angular Momentum beam generated from a 61 channels Coherent Beam Combining femtosecond laser

“…The XCAN laser setup [7,10] relies on 61 individually amplified and coherently combined beamlets, the phase of each being controlled in real time (kHz) via the combined used of variable optical delay lines, piezo-mechanical fiber stretchers, an interferometric phase measurement and a Stochastic Parallel Gradient Descent (SPGD) algorithm. Individual amplitudes can be adjusted through amplifier gain control.…”