10.4  kW coherently combined ultrafast fiber laser

Abstract

An ultrafast laser delivering 10.4 kW average output power based on coherent combination of twelve stepindex fiber amplifiers is presented. The system emits close-to-transform-limited 254 fs pulses at 80 MHz repetition rate, has a high beam quality (M 2 ≤1.2), and a low relative intensity noise of 0.56% in the frequency range of from 1 Hz to 1 MHz. Automated spatiotemporal alignment allows for hands-off operation.

Compact, All-PM Fiber Integrated and Alignment-Free Ultrafast Yb:Fiber NALM Laser With Sub-Femtosecond Timing Jitter

“…17 MHz in all simulations, due to requirements in one of our target applications [29]. We also kept the net intracavity dispersion fixed at −0.01 ps 2 for short pulse duration and low-noise operation. Finally, we kept the gain fiber length fixed at 0.6 m. We had optimized this length experimentally in similar Yb:fiber oscillators prior to the simulations.…”

Orbital angular momentum beams generation from 61 channels coherent beam combining femtosecond digital laser

“…The electric field transverse distribution observed in this lens focal plane indeed results from the coherent addition of all 61 tiled beams accurately phased together. When compared to filled-aperture [11], tiled-aperture CBC is inherently limited in efficiency to the power concentrated into the main lobe in the far field (67% theoretically) but offers an unrivaled agility in terms of far field beam shaping.…”

Structured light for ultrafast laser micro- and nanoprocessing

“…6,7,[22][23][24][25] There is ongoing progress regarding the display's ability to resist high peak and average powers, so that these devices may be part of future industrial processing optics forming ultrashort pulsed optical radiation in the kilowatt and tens-of-millijoules class. [26][27][28] Equally conceivable are concepts where the laser system itself is able to provide structured light. Such systems based, for example, on intracavity beam shaping, 29,30 amplified transverse fiber modes, 31,32 or on coherent beam combining [33][34][35] enable complex focus shaping up to highly dynamic focus scanning and splitting.…”