High – repetition - rate ultrafast fiber lasers for material processing
Ilday, F. Ö.
IEEE Journal of Selected Topics in Quantum Electronics
Institute of Electrical and Electronics Engineers
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Please cite this item using this persistent URLhttp://hdl.handle.net/11693/49295
Ultrafast lasers operating at high repetition rates, in particular the GHz range, enable new possibilities in lasermaterial processing, particularly accessing the recently demonstrated ablation-cooled regime. We provide a unified perspective of the unique opportunities created by operating at high repetition rates together with our efforts into the development of enabling laser technology, including new results on further scaling up the capabilities of the laser systems. In order to access GHz repetition rates and microjoule-level pulse energies without requiring kilowatts of average power, we implement burst-mode operation. Our results can be grouped into two distinct directions: low- and highpower systems. Pulsed pumping is employed in the later stages of low-power systems, which have low burst repetition rates to achieve high pulse energies, whereas the technique of doping management is developed for the continuously pumped power amplifier stage of high power systems. While most of the developments have been at 1-µm wavelength range due to the relative maturity of the laser technology, we also report the development of Tm-fiber lasers around the 2-µm region specifically for tissue processing and laser-surgery applications.
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