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 $\beta$-BaB${}_2$O${}_4$ (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 $130\mathrm{h}$ uninterrupted operation without decay in output power at $313\mathrm{nm}$. The robustness of the system has been confirmed by exposing it to accelerations of up to $1\mathrm{g}$ with less than $10\%$ in-lock output power variations. Furthermore, the cavity can withstand 30~minutes of acceleration exposure at a level of $3{\mathrm{g}}_{\mathrm{rms}}$ without substantial change in SHG output power, demonstrating that the design is suitable for transportable setups.

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