A highly stable monolithic enhancement cavity for SHG generation in the UV
Abstract
We present a highly stable bow-tie power enhancement cavity for critical second-harmonic generation into the UV using a Brewster-cut -BaBO (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 uninterrupted operation without decay in output power at . The robustness of the system has been confirmed by exposing it to accelerations of up to with less than in-lock output power variations. Furthermore, the cavity can withstand 30~minutes of acceleration exposure at a level of without substantial change in SHG output power, demonstrating that the design is suitable for transportable setups.
Keywords
Cite
@article{arxiv.1709.07188,
title = {A highly stable monolithic enhancement cavity for SHG generation in the UV},
author = {S. Hannig and J. Mielke and J. A. Fenske and M. Misera and N. Beev and C. Ospelkaus and P. O. Schmidt},
journal= {arXiv preprint arXiv:1709.07188},
year = {2018}
}