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Hannig, S. [Author]; Mielke, J. [Author]; Fenske, J.A. [Author]; Misera, M. [Author]; Beev, N. [Author]; Ospelkaus, C. [Author]; Schmidt, Piet O. [Author]

A highly stable monolithic enhancement cavity for second harmonic generation in the ultraviolet - [published Version]

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  • Media type: Text; E-Article
  • Title: A highly stable monolithic enhancement cavity for second harmonic generation in the ultraviolet
  • Contributor: Hannig, S. [Author]; Mielke, J. [Author]; Fenske, J.A. [Author]; Misera, M. [Author]; Beev, N. [Author]; Ospelkaus, C. [Author]; Schmidt, Piet O. [Author]
  • imprint: College Park, MD : American Institute of Physics, 2018
  • Published in: Review of Scientific Instruments 89 (2018), Nr. 1
  • Issue: published Version
  • Language: English
  • DOI: https://doi.org/10.15488/3075; https://doi.org/10.1063/1.5005515
  • Keywords: crystal ; Optical frequency conversion ; Harmonic generation ; Barium alloys ; Nonlinear frequency conversion ; Anti reflection ; Barium compounds ; Piezo actuator ; Nonlinear crystals ; Uninterrupted operations ; Cavity geometry ; ultraviolet radiation ; Enhancement cavities ; Open systems ; article ; acceleration ; Nonlinear optics ; Wavelength ranges ; geometry
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  • Description: 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).
  • Access State: Open Access