High-power ultrafast thin-disk multipass amplifiers for efficient laser-based manufacturing

Ahmed, Marwan Abdou; Roecker, C.; Loescher, André; Bienert, Florian; Holder, Daniel; Weber, Rudolf; Onuseit, Volkher; Graf, Thomas

doi:10.1515/aot-2021-0047

Cited by 14 publications

(8 citation statements)

References 25 publications

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“…We were able to demonstrate an average output power of 100 W and a small signal gain up to 17 dB while the pulse duration of 2 ps did not change significantly. This validates the expected behavior as reported for TDMPA by Ahmed et al 3…”

Section: Introductionsupporting

confidence: 92%

“…Ranging from high power, high energy laser facilities 1 over specialty lasers for scientific experiments 2 to applications in material processing. 3 In these latter two regimes the application of thin-disk multipass amplifiers has led to impressive results for Yb doped laser crystals around 1030 nm wavelength. A combination of regenerative and multipass amplified thin-disk systems was used to generate 720 mJ, 1 ps-pulses at 1 kHz repetition rate.…”

Section: Introductionmentioning

confidence: 99%

“…A chirp free system, amplifying ps-pulses without pre-chirp and compression segments, has been demonstrated at lower pulse energies around 7 mJ at 2 kW of average power by combing two multipass thin-disk amplification stages. 3 With this system, high laser milling rates greater than 100 mm 3 /min for several materials were demonstrated. Both approaches demonstrate the potential for thin-disk-multipass-amplifier (TDMPA) systems.…”

Section: Introductionmentioning

confidence: 99%

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Compact chirp-free ps-pulse wedged thin-disk amplifier

Lorbeer,

Schweizer,

Ewers

et al. 2024

High-Power Laser Ablation VIII

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Amplifying ps-laser radiation to high pulse-energies as well as a high average output power is a challenging task. In the past it was shown that thin-disk multipass amplifiers can achieve excellent properties for ultrashort laser pulses at over 1 kW of average power. Furthermore, systems combining multipass and regenerative thindisk amplifiers achieved 700 mJ of pulse energy at a repetition rate of 1000 Hz. These systems reaching such excellent properties are complex, extensive and typically need dozens of mirror-optics and the corresponding space associated with those. With the introduction of our monolithic wedged thin-disk (WTD) concept we were able to demonstrate small signal laser amplification of up to 10 (+10 dB) for cw-systems with a drastically reduced amount of mirror optics as well as space needed. By adding a redirecting mirror to introduce two multipasses in the WTD we were able to amplify a 2 ps-laser source with a small signal gain of up to 55 (+17 dB) and at 20 W seed power by a factor of 5 (+7 dB) reaching up to 100 W of output power.

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Section: Introductionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Compact chirp-free ps-pulse wedged thin-disk amplifier

Lorbeer,

Schweizer,

Ewers

et al. 2024

High-Power Laser Ablation VIII

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“…Both seed beams are combined and collinearly overlayed via polarization-multiplexing using the combination of respective optics to rotate the linear polarized seed beams (half-wave plates, HWP) and thin film polarizers as described in references 3,4 . The combined beams are subsequently injected into the amplifier.…”

Section: Description Of the Systemmentioning

confidence: 99%

Fast switchable CW to ultrashort pulsed high-power laser beam from a single thin-disk multipass amplifier

Schmittner,

Löscher,

Reiff

et al. 2024

Solid State Lasers XXXIII: Technology and Devices

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To open up new opportunities in laser material processing, combining multiple processes in parallel or fast sequence schemes is a promising concept. A single laser source with dynamic and flexible operation modes is highly demanded for these tasks. In this contribution, we will present a versatile laser system which is the first step toward the Universal Laser Machine capable of being used for a broad range of laser-based manufacturing tasks.The laser system presented here consists of a single thin-disk multipass amplifier capable of sequentially or simultaneously amplifying both continuous wave (CW) and ultra-short pulsed (USP) laser radiation and delivering kW-class average output power. The approach uses a polarization-multiplexing scheme to amplify two seeds (CW and sub-10 picoseconds) within a common amplifier. This allows for the generation of a single, nearly diffraction-limited output beam composed of CW or USP or both CW and USP radiation at a wavelength of 1030 nm. High versatility of the system is achieved by the implementation of multiple acousto-optic modulators, which enables fast (on a microsecond timescale) switching capabilities between different powers and operation modes. A quick change between the operation state of sole CW, sole USP, and combined output radiation with arbitrary power ratio can thus be realized. Furthermore, our system includes the possibility of a seamless adjustment of the absolute average output power values of each CW and USP fraction of the generated beam.

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“…The availability of larger and more powerful pulsed laser systems has enabled ever more high-throughput material processing methods [1,2,3]. Industrial high-power laser systems allow these new methods to be introduced into the manufacturing of new parts [4].…”

Section: Thin Disks With a Wedgementioning

confidence: 99%