Oxborrow, M; Webster, S A; Gill, P (2002) Stability of ND:YAG 'flywheel' lasers locked to ultra-high-finesse etalons made from either ULE or mono-crystalline-sapphire. In: Proceedings of the 6th Symposium on Frequency Standards and Metrology, 9-14 September 2001, University of St Andrews, Fife, Scotland, UK.

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Abstract

We report on our progress towards the realization of coherent light sources delivering sub-Hz linewidths and frequency drifts below 0.01 Hz/s, as enabling technologies for the ultra-high-precision spectroscopy of trapped ions. To date, we have concentrated on the servo-locking, via the Pound-Drever-Hall (PDH) technique, of two makes of commercial infrared (1064nm) Nd:YAG lasers (viz NPRO's) to the fringes of various lab-designed ultra-high-finesse etalons, incorporating either ULE or mono-crystalline-sapphire spacers. The two main thrusts of our recent work have been (i) the enhancement of the locking accuracy through the optimisation of optical/electro-optical components and peripheral servo-electronics, and (ii) the design, construction and commissioning of two 'creep-free' etalons, whose spacers and mirrors exclusively comprise c-axis-aligned, high-purity sapphire, held at liquid-helium temperatures.

Item Type:	Conference or Workshop Item (UNSPECIFIED)
Subjects:	Time and Frequency
Last Modified:	02 Feb 2018 13:17
URI:	https://eprintspublications.npl.co.uk/id/eprint/2524