| Zugriffsnummer | 48725 |
| Dokumenttyp | Repository E-Print |
| Peer Review | ohne Peer Review |
| Sprache | Englisch |
| Titel | Phase-stabilized UV light at 267 nm through twofold second harmonic generation |
| Autor(in); Institution | |
| Quelle/Jahr | arXiv:2209.01938 [physics.optics]:(2022), 1 - 17 |
| Availability | [online only] |
| URL | |
| Freie Schlagworte | Optical clocks ; Atoms and ions ; Phase-stabilized UV light |
| Zusammenfassung | 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 uW 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 uW 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 5 x 10^-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. |
| Kostenfreier Zugang | Open Access Green |
| Rechteinformation | CC BY 4.0 ; Creative Commons Attribution 4.0 License |
| Themenbereich der Metrologie | Zeit und Frequenz |