Power scaling of ultrafast oscillators: 350-W average-power sub-picosecond thin-disk laser

Saltarelli, Francesco; Graumann, I. J.; Lang, Lukas; Bauer, Dominik; Phillips, Christopher; Keller, U.

doi:10.1364/oe.27.031465

Cited by 65 publications

(32 citation statements)

References 34 publications

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“…In the 1-µm wavelength region, up to 206 mJ and 1.4 kW have been demonstrated using regenerative amplifiers [29], and 4.7 mJ and 1.4 kW using multi-pass amplifiers [28]. Moreover, single-box modelocked oscillators have achieved up to 350-W average power [30] and 80-µJ pulse energies [31].…”

Section: Introduction and State-of-the-artmentioning

confidence: 99%

Moving towards high-power thin-disk lasers in the 2 µm wavelength range

et al. 2021

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Thin-disk lasers (TDLs) have made spectacular progress in the last decades both in continuous-wave and ultrafast operation. Nowadays, single thin-disk oscillators with > 16 kW of continuous-wave (CW)-power have been demonstrated and ultrafast amplifiers have largely surpassed the kilowatt milestone with pulse energies in the multi-100 mJ range. This amazing development has been demonstrated in the 1-µm wavelength range, using Yb-doped materials and supported by industrially available components. Motivated by both strong scientific and industrial applications, interest in expanding this performance to longer wavelength regions continues to increase. In particular, TDLs emitting directly in the short-wave mid-infrared (SW-MIR) region (2-3 µm) are especially sought after, and although many early studies have been reported, most remained in the proof-of-principle stage and the potential for multi-100-W operation remained undemonstrated. Here, we report on our recent results of a single fundamental-mode CW Ho:YAG thin-disk oscillator with >100 W of power, surpassing previous single-mode TDLs by a factor of >4, and marking a first milestone in the development of high-power SW-MIR TDLs. In optimized conditions, our laser system emitting at » 2.1 µm reaches an output power of 112 W with 54.6-% optical-to-optical efficiency and an M 2 = 1.1. This system is ideally suited for future direct modelocking at the 100 W level, as well as for ultrafast amplification. We start the discussion with a review of the state-of-the-art of TDLs emitting directly in the vicinity of 2 µm, and then discuss difficulties and possible routes both towards ultrafast operation and next possible steps for power scaling.

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Section: Introduction and State-of-the-artmentioning

confidence: 99%

Moving towards high-power thin-disk lasers in the 2 µm wavelength range

et al. 2021

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“…Consequently, a higher seed power is required to increase the absorption of the pump light and the output power for incident pump powers in excess of 1 kW. Assuming a seed power of 500 W (which might be available from a mode locked thin-disk oscillator in the near future [30]), the numerical model predicts an output power exceeding 1 kW at an incident pump power of 2 kW. The beam quality calculated at this power level amounts to 3.63 and the calculated absorption of the pump radiation is 54%.…”

Section: Discussionmentioning

confidence: 99%

Amplification of radially polarized ultra-short pulsed radiation to average output powers exceeding 250 W in a compact single-stage Yb:YAG single-crystal fiber amplifier

et al. 2020

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“…Yb:YAG is the most widely used thin-disk crystal due to its outstanding properties. Power levels of several hundred watts and peak powers of more than 40 MW have been delivered directly from mode-locked Yb:YAG thin-disk oscillators [26][27][28][29]. Recently, Fischer et al realized 105 fs pulses from a Yb:YAG thin-disk oscillator with intracavity average power of 470 W, which was used for intra-oscillator high harmonic generation [30].…”

Section: Introductionmentioning

confidence: 99%

Distributed Kerr Lens Mode-Locked Yb:YAG Thin-Disk Oscillator

et al. 2022

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Ultrafast laser oscillators are indispensable tools for diverse applications in scientific research and industry. When the phases of the longitudinal laser cavity modes are locked, pulses as short as a few femtoseconds can be generated. As most high-power oscillators are based on narrow-bandwidth materials, the achievable duration for high-power output is usually limited. Here, we present a distributed Kerr lens mode-locked Yb:YAG thin-disk oscillator which generates sub-50 fs pulses with spectral widths far broader than the emission bandwidth of the gain medium at full width at half maximum. Simulations were also carried out, indicating good qualitative agreement with the experimental results. Our proof-of-concept study shows that this new mode-locking technique is pulse energy and average power scalable and applicable to other types of gain media, which may lead to new records in the generation of ultrashort pulses.

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Power scaling of ultrafast oscillators: 350-W average-power sub-picosecond thin-disk laser

Cited by 65 publications

References 34 publications

Moving towards high-power thin-disk lasers in the 2 µm wavelength range

Moving towards high-power thin-disk lasers in the 2 µm wavelength range

Amplification of radially polarized ultra-short pulsed radiation to average output powers exceeding 250 W in a compact single-stage Yb:YAG single-crystal fiber amplifier

Distributed Kerr Lens Mode-Locked Yb:YAG Thin-Disk Oscillator

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