Details
| Original language | English |
|---|---|
| Pages (from-to) | 44992-45007 |
| Number of pages | 16 |
| Journal | Optics express |
| Volume | 30 |
| Issue number | 25 |
| Early online date | 28 Nov 2022 |
| Publication status | Published - 5 Dec 2022 |
Abstract
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 µW 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 µW 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 5×10−17 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 × 10−18 at 1 s.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Optics express, Vol. 30, No. 25, 05.12.2022, p. 44992-45007.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Phase-stabilized UV light at 267 nm through twofold second harmonic generation
AU - Dawel, F.
AU - Hannig, S.
AU - Kramer, J.
AU - Nauk, C.
AU - Schmidt, P. O.
AU - Kraus, Benjamin
N1 - Funding Information: Funding. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Project-ID (434617780 - SFB 1464); and under Germany’s Excellence Strategy (EXC-2123 Quantum Frontiers–390837967); European Metrology Programme for Innovation and Research (EMPIR) cofinanced from the participating 5 states and European Union’s Horizon 2020 Research and Innovation Programme (Project No. 20FUN01 TSCAC); State of Lower Saxony, Hannover, Germany, through Niedersächsisches Vorab.
PY - 2022/12/5
Y1 - 2022/12/5
N2 - 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 µW 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 µW 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 5×10−17 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 × 10−18 at 1 s.
AB - 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 µW 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 µW 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 5×10−17 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 × 10−18 at 1 s.
UR - http://www.scopus.com/inward/record.url?scp=85144216635&partnerID=8YFLogxK
U2 - 10.1364/OE.471450
DO - 10.1364/OE.471450
M3 - Article
C2 - 36522911
AN - SCOPUS:85144216635
VL - 30
SP - 44992
EP - 45007
JO - Optics express
JF - Optics express
SN - 1094-4087
IS - 25
ER -