139 GHz UV phase-locked Raman laser system for thermometry and sideband cooling of ${}^9$Be${}^{+}$ ions in a Penning trap

Johannes Mielke, Julian Pick, Julia A. Coenders +5

We demonstrate phase locking of two ultraviolet laser sources by modulating a fundamental infrared laser with 4th-order sidebands using an electro-optic modulator and phase locking…