&gt;100 W GHz femtosecond burst mode all-fiber laser system at 1.0 µm

Liu, Yicai; Wu, Jiming; Wen, Xiaoxiao; Lin, Wei; Wang, Wenlong; Guan, Xianchao; Qiao, Tian; Guo, Yuankai; Wang, Weiwei; Wei, Xiaoming; Yang, Zhongmin

doi:10.1364/oe.391515

Cited by 26 publications

(9 citation statements)

References 40 publications

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“…The 2.65 GHz repetition rate bursts of ultra-short laser pulses containing a desirable number of pulses within a burst with identical pulse separation and adjustable amplitude were demonstrated in an active fiber loop [34]. A burst mode all-fiber laser system operating at an intra-burst repetition rate of up to 1.2 GHz with pulse duration <500 fs and average power higher than 100 W [35]. That all-fiber laser could be a promising tool for micromachining applications requiring fs pulses with both high average power and high repetition rate.…”

Section: Ghz Laser Sources For Materials Processingmentioning

confidence: 99%

Ultra-Short Pulse Lasers for Microfabrication: A Review

Račiukaitis

2021

IEEE J. Select. Topics Quantum Electron.

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Ultra-short pulse lasers, generating coherent light pulses with pulse durations in the picosecond and femtosecond range, are becoming popular in precision laser microfabrication. They are benefiting not only from well-predicted laser ablation with the suppressed heat-affected zone but also by opening new processing opportunities, especially in transparent materials, due to enhanced non-linear interaction with the material. In this review, the evolution of various kinds of mode-locked lasers from a scientific toy to a robust industrial tool is reviewed. The utilization benefits of high-average-power, high-pulse-repetition-rate ultra-short pulse laser are closely related to beam shaping and manipulation techniques. Fast beam scanning with galvanometric and polygon scanners as well as multi-beam parallel processing methods were developed. Some hot applications areas are briefly described. The efficient use of photons from ultra-short pulse lasers pushed the development of optimization methods in the ablation process. Efforts toward upscaling the process by increasing the average power of mode-locked lasers made feedback to laser developers, and burst regime became a necessity as well as high-speed beam scanning devices. Unique opportunities of ultra-short pulses are successfully exploited in machining transparent materials, with glass separation being the leading application.

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Section: Ghz Laser Sources For Materials Processingmentioning

confidence: 99%

Ultra-Short Pulse Lasers for Microfabrication: A Review

Račiukaitis

2021

IEEE J. Select. Topics Quantum Electron.

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“…To fulfil a high throughput and quality requirements coming from the laser-based manufacturing industry, laser technology must constantly evolve. Therefore, laser source manufacturers build lasers with hundreds of watts of average optical power, pulse repetition rates in the range of MHz and even GHz and near-THz in the burst mode regimes [1,2]. Newly developed fast laser beam scanning systems are capable of reaching scanning speeds of hundreds of meters per second [3].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser ablation by bibursts in the MHz and GHz pulse repetition rates

et al. 2021

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Here, to the best of our knowledge, for the first time we report the in-depth study of extremely high ultrafast laser ablation efficiency for processing of copper and steel with single-pulses, MHz-, GHz-and burst in the burst (biburst) regime. The comparison of burst, biburst and single-pulse ablation efficiencies was performed for beam-size-optimised regimes, showing the real advantages and disadvantages of milling and drilling processing approaches. Highly-efficient ultrashort pulse laser processing was achieved for ~1 µm wavelength: 8.8 µm 3 /µJ for copper drilling, 5.6 µm 3 /µJ for copper milling, and 6.9 µm 3 /µJ for steel milling.We believe that the huge experimental data collected in this study will serve well for the better understanding of laser burst-matter interaction and theoretical modelling.

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“…In fact, for few 10s of MHz and even up to GHz pulse repetition frequency laser systems, burst operation allows a combination of quasi- cw heating effects to support rapid etching rates and ultrafast laser interactions for clean ejection of material [ 66 ] or to reaching the so called ablation-cooled regime [ 12 ]. Compared with other amplifier-based systems with high repetition frequency such as fiber-laser systems where a low-power AOM is typically used before the main amplification stages to generate bursts at high average power [ 67 , 68 ], thin-disk oscillators requires Pockels-cell which can support several 100 W average power and high repetition rates. Currently, the state-of-the-art in terms of power handling of high repetition rate BBO-crystal based Pockels cells is >500 W at approximately 250 kHz [ 69 ].…”

Section: Current Research Directions and Challengesmentioning

confidence: 99%

High-power modelocked thin-disk oscillators as potential technology for high-rate material processing

Wang

Tomilov

Saraceno

2021

Advanced Optical Technologies

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High average power femtosecond lasers have made spectacular progress in the last decades – moving from laboratory-based systems with maximum average powers of tens of watts to kilowatt-class mature industrial systems in a short time. The availability of such systems opens new possibilities in many fields; one of the most prominent ones that have driven many of these technological advances is precise high-speed material processing, where ultrashort pulses have long been recognized to provide highest precision processing of virtually any material, and high average power extends these capabilities to highest processing rates. Here, we focus our attention on one high-average power technology with large unexplored potential for this specific application: directly modelocked multi-MHz repetition frequency high-power thin-disk oscillators. We review their latest state-of-the-art and discuss future directions and challenges, specifically with this application field in mind.

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>100 W GHz femtosecond burst mode all-fiber laser system at 1.0 µm

Cited by 26 publications

References 40 publications

Ultra-Short Pulse Lasers for Microfabrication: A Review

Ultra-Short Pulse Lasers for Microfabrication: A Review

Femtosecond laser ablation by bibursts in the MHz and GHz pulse repetition rates

High-power modelocked thin-disk oscillators as potential technology for high-rate material processing

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