A highly stable monolithic enhancement cavity for second harmonic generation in the ultraviolet

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Hannig, S.; Mielke, J.; Fenske, J.A.; Misera, M.; Beev, N. et al.: A highly stable monolithic enhancement cavity for second harmonic generation in the ultraviolet. In: Review of Scientific Instruments 89 (2018), Nr. 1, 13106. DOI: https://doi.org/10.1063/1.5005515

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Abstract: 
We present a highly stable bow-tie power enhancement cavity for critical second harmonic generation (SHG) into the UV using a Brewster-cut β-BaB2O4 (BBO) nonlinear crystal. The cavity geometry is suitable for all UV wavelengths reachable with BBO and can be modified to accommodate anti-reflection coated crystals, extending its applicability to the entire wavelength range accessible with non-linear frequency conversion. The cavity is length-stabilized using a fast general purpose digital PI controller based on the open source STEMlab 125-14 (formerly Red Pitaya) system acting on a mirror mounted on a fast piezo actuator. We observe 130 h uninterrupted operation without decay in output power at 313 nm. The robustness of the system has been confirmed by exposing it to accelerations of up to 1 g with less than 10% in-lock output power variations. Furthermore, the cavity can withstand 30 min of acceleration exposure at a level of 3 grms without substantial change in the SHG output power, demonstrating that the design is suitable for transportable setups. © 2018 Author(s).
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: article
Publishing status: publishedVersion
Issue Date: 2018
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of Germany Germany 32 94.12%
2 image of flag of United States United States 1 2.94%
3 image of flag of China China 1 2.94%

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