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8 June 2023 Highly efficient nonlinear spectral broadening of mJ pulses at 2µm wavelength in a gas multipass cell and compression sub-30 fs (Conference Presentation)
Lucas Eisenbach, Peter Rußbüldt, Jan Schulte, Rudolf Meyer, Tobias Heuermann, Ziyao Wang, Mathias Lenski, Philipp Gierschke, Jens Limpert, Constantin Häfner
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Proceedings Volume PC12577, High-power, High-energy Lasers and Ultrafast Optical Technologies; PC125770E (2023) https://doi.org/10.1117/12.2669583
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic
Abstract
Within this work we demonstrate the efficient nonlinear temporal compression of mJ pulses emitted by an ultrafast thulium-doped fiber laser system. For spectral broadening, a krypton and helium filled Herriott-type multi-pass cell with broadband dielectric mirrors is employed. The input pulses with 1,78 mJ and 85 fs are spectrally broadened and subsequently compressed utilizing fused silica plates revealing a pulse duration below 29 fs while featuring an overall transmission of 91%. In addition to the preservation of the input beam quality, the system exhibits a shot-to-shot noise ratio of less than 1.2% as well as an excellent long-term power stability with fluctuations below 1% over a time span of 2 hours. The presented results demonstrate the advantageous properties of the multi-pass cell approach: High efficiency and high transversal beam quality at high average power, not only for conventional ultrafast ytterbium-based laser systems at 1 µm wavelength, but also in the mid-infrared regime. We believe that this system, delivering an average power above 162 W and sub-5-cycle pulse duration, provides a promising working point for following secondary source experiments like THz- or high harmonic generation.
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Lucas Eisenbach, Peter Rußbüldt, Jan Schulte, Rudolf Meyer, Tobias Heuermann, Ziyao Wang, Mathias Lenski, Philipp Gierschke, Jens Limpert, and Constantin Häfner "Highly efficient nonlinear spectral broadening of mJ pulses at 2µm wavelength in a gas multipass cell and compression sub-30 fs (Conference Presentation)", Proc. SPIE PC12577, High-power, High-energy Lasers and Ultrafast Optical Technologies, PC125770E (8 June 2023); https://doi.org/10.1117/12.2669583
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KEYWORDS
Ultrafast phenomena
Laser systems engineering
Pulse signals
Relative intensity noise
Helium
High harmonic generation
Krypton
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