Journal
OPTICS EXPRESS
Volume 30, Issue 25, Pages 44992-45007Publisher
Optica Publishing Group
DOI: 10.1364/OE.471450
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [434617780-SFB 1464]
- European Metrology Programme for Innovation and Research (EMPIR)
- European Union [20FUN01 TSCAC]
- State of Lower Saxony, Hannover, Germany
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This paper reports a laser system that provides phase-stabilized UV light for an aluminum ion optical clock. The system generates over 50 μW of 267.4 nm light through frequency-quadrupling a fiber laser, and the measured phase stability supports a frequency instability of less than 5x10-17 after 1 second.
Providing phase stable laser light is important to extend the interrogation time of optical clocks towards many seconds and thus achieve small statistical uncertainties. We report a laser system providing more than 50 mu W phase-stabilized UV light at 267.4 nm for an aluminium ion optical clock. The light is generated by frequency-quadrupling a fibre laser at 1069.6 nm in two cascaded non-linear crystals, both in single-pass configuration. In the first stage, a 10 mm long PPLN waveguide crystal converts 1 W fundamental light to more than 0.2 W at 534.8 nm. In the following 50 mm long DKDP crystal, more than 50 mu W of light at 267.4 nm are generated. An upper limit for the passive short-term phase stability has been measured by a beat-node measurement with an existing phase-stabilized quadrupling system employing the same source laser. The resulting fractional frequency instability of less than 5x10-17 after 1 s supports lifetime-limited probing of the 27Al+ clock transition, given a sufficiently stable laser source. A further improved stability of the fourth harmonic light is expected through interferometric path length stabilisation of the pump light by back-reflecting it through the entire setup and correcting for frequency deviations. The in-loop error signal indicates an electronically limited instability of 1 x 10-18 at 1 s.
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