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Recent development of thin-disk multipass amplifiers has resulted in several breakthroughs in average power and pulse energy of both ps- and fs-amplifiers [1-3]. These results confirm the suitability of this laser architecture for amplification of ultrafast pulses with high energy and at high average powers thanks to low nonlinearities in the thin-disk and to an efficient cooling scheme. However,...
The advantages of radially and azimuthally polarized laser beams for various applications in materi processing, e.g. cutting and drilling, over circularly or linearly polarized beams has been reported amoi others in [1]. Furthermore, for micro material processing ultrafast lasers with pulse durations in the ord of 1 ps have gained tremendous interest. The oscillator we present here is a promising...
Femtosecond laser systems are the enabling technology for cold ablation, a process that removes layers of material with virtually no thermal side-effects, and therefore leads to a superior quality without additional post-processing steps [1, 2]. Cold ablation can be applied to even the most complex and hardest to machine materials, like diamond, ceramics, polymers and metals, making the femtosecond...
In recent years the evolution of the average output power emitted by high-power fiber-lasers and amplifiers has reached a level at which the onset of thermal effects has been observed. The most detrimental of these effects is the phenomenon of transverse mode instabilities (TMI) [1]. These instabilities are characterized by a sudden onset of spatial and temporal fluctuations in a formerly stable beam...
Motivation and objectives: The technology of Mode-Locked Semi-Conductor Lasers (MLSCL) is a promising candidate for various space applications in the context of high-precision optical metrology, in particular for High Accuracy Absolute Long Distance Measurement (HAALDM). However very challenging performance requirements should be met for these applications: pulse duration<1ps, pulse repetition...
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