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arXiv · 2106.13532

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·Teresa Meiners·Malte Niemann·Juan M. Cornejo·Stefan Ulmer·Christian Ospelkaus
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Abstract

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 of one sideband to a second fundamental infrared laser. Subsequent sum frequency generation and second harmonic generation successfully translates the frequency offset to the ultraviolet domain. The phase lock at 139 GHz is confirmed through stimulated Raman transitions for thermometry of $^9$Be$^+$ ions confined in a cryogenic Penning trap. This technique might be used for sideband cooling of single $^9$Be$^+$ ions as well as sympathetic cooling schemes and quantum logic based measurements in Penning traps in the future.

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Johannes Mielke, Julian Pick, Julia A. Coenders, Teresa Meiners, Malte Niemann, Juan M. Cornejo, Stefan Ulmer, Christian Ospelkaus. 2021-06-25. 139 GHz UV phase-locked Raman laser system for thermometry and sideband cooling of $^9$Be$^+$ ions in a Penning trap. https://doi.org/10.1088/1361-6455/ac319d

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