Frequency stabilization of an ultraviolet laser to ions in a discharge
E.W. Streed, T.J. Weinhold, D. Kielpinski
TL;DR
This paper presents a method to stabilize a UV laser to Yb+ ions in a discharge lamp, achieving MHz-level stability suitable for quantum information experiments.
Contribution
It introduces a stabilization technique using Zeeman spectroscopy of ions in a discharge lamp, with validation against trapped ion fluorescence.
Findings
Frequency fluctuation of 1.7 MHz RMS over 1000 s
Frequency drift of 20 MHz over 7 days
Method suitable for quantum information processing with trapped ions
Abstract
We stabilize an ultraviolet diode laser system at 369.5 nm to the optical absorption signal from Yb+ ions in a hollow-cathode discharge lamp. The error signal for stabilization is obtained by Zeeman spectroscopy of the 3 GHz-wide absorption feature. The frequency stability is independently measured by comparison against the fluorescence signal from a laser-cooled crystal of 174Yb+ ions in a linear Paul trap. We measure a frequency fluctuation of 1.7 MHz RMS over 1000 s, and a frequency drift of 20 MHz over 7 days. Our method is suitable for use in quantum information processing experiments with trapped ion crystals.
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