Phys.org  October 1, 2021 Researchers in Germany have combined a fiber-laser system with multi-pass cells to create a laser with a combination of few-cycle pulses at high average power, pulse energy and repetition rate and with stable carrier envelope phase (CEP) operation. The system coherently combines eight amplifier channels. It emits 300-fs pulses that are then compressed down to the few-cycle regime using two multi-pass cells. The first multi-pass cell uses standard dielectric mirrors and the second cell uses metal-based mirrors. With further improvements, they hope to achieve less than 300 mrad of CEP noise. The laser system opens new […]