Multi-kW Thin-Disk Amplifiers

Teisset, Catherine Y.; Wandt, Christoph; Schultze, Marcel; Klingebiel, Sandro; Häfner, Matthias; Prinz, Stephan; Stark, Sebastian; Grebing, Christian; Negel, Jan-Philipp; Höck, Helge; Scharun, Michael; Dietz, Thomas; Bauer, Dominik; Budnicki, Aleksander; Stolzenburg, Christian; Sutter, Dirk; Killi, Alexander; Metzger, Thomas

doi:10.1364/hilas.2018.ht1a.6

Cited by 9 publications

(4 citation statements)

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“…At present, it is still a demanding task to separate and understand the many effects that occur during the drilling process. With the use of additional process strategies such as helical drilling [3][4][5][6], the use of process gas [3] and focus adjustment [7] as well as the availability of higher pulse energies of up to several millijoules [8,9], not only the number of process parameters increases, but also the number of effects that occur. Thus, it is still challenging to reliably predict the drilling depth, borehole geometry, and drilling duration, especially with analytical models.…”

Section: Introductionmentioning

confidence: 99%

High-quality percussion drilling with ultrashort laser pulses

et al. 2021

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The influence of the laser fluence on the quality of percussion-drilled holes was investigated both experimentally and by an analytical model. The study reveals that the edge quality of the drilled microholes depends on the laser fluence reaching the rear exit of the hole and changes with the number of pulses applied after breakthrough. The minimum fluence that must reach the hole’s exit in order to obtain high-quality microholes in stainless steel was experimentally found to be 2.8 times the ablation threshold.

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Section: Introductionmentioning

confidence: 99%

High-quality percussion drilling with ultrashort laser pulses

et al. 2021

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“…High-energy few-cycle MIR drivers are mainly enabled by optical parametric chirped pulse amplifiers (OPCPA) pumped with commercial high-power picosecond lasers around 1 µm [12][13][14][15]. Using such a pump laser, it is possible to obtain MIR pulses from 2 µm to 4 µm via different nonlinear crystals such as BBO [16], BiBO [17], LNO [18], PPLN [19] and KTA [20].…”

Section: Introductionmentioning

confidence: 99%

27 W 2.1 µm OPCPA system for coherent soft X-ray generation operating at 10 kHz

et al. 2020

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We developed a high power optical parametric chirped-pulse amplification (OPCPA) system at 2.1 µm harnessing a 500 W Yb:YAG thin disk laser as the only pump and signal generation source. The OPCPA system operates at 10 kHz with a single pulse energy of up to 2.7 mJ and pulse duration of 30 fs. The maximum average output power of 27 W sets a new record for an OPCPA system in the 2 µm wavelength region. The soft X-ray continuum generated through high harmonic generation with this driver laser can extend to around 0.55 keV, thus covering the entire water window (284 eV-543 eV). With a repetition rate still enabling pump-probe experiments on solid samples, the system can be used for many applications.

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“…Due to the limited speed of conventional galvo scanners, the employed average power levels are typically below 100 W (either in the near infrared or after frequency conversion to the green or UV) in order to prevent thermal affects [2] [3]. Some applications, however, could use much higher output powers and pulse energies, such as large-scale surface structuring [4] [21]). While fiber lasers are core-size limited in pulse energy, multiplying their output by coherent combination has recently been demonstrated up to 3.5 kW at a high 80 MHz repetition rate and therefore limited pulse energy <1 mJ [22].…”

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confidence: 99%

“…Even in oscillator-only operation modelocked thin-disk lasers in the kW range are conceivable with 100-µJ-class pulse energy [25] [26]. Thin-disk amplifiers have been demonstrated with multi-100-mJ pulse energy, demonstrating potential for J-class operation [16] [17] [21]. Using a monolithic Yb:YAG thindisk multi-pass CPA-free laser amplifier, which geometrically multiplexes the seed beam 36 times on the thin-disk pumped at wavelength of 941 nm, we recently demonstrated 2.3 mJ of pulse energy at 1.4 kW average output power, 950 fs pulse duration and M² < 1.8 beam quality [20].…”

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confidence: 99%