CAN - Optical Frequency Comb

Concepts

• teddington
• precision equipment
• laboratory and optical equipment
• optical clocks
• optical frequency combs
• telecoms optical fibre links
• optical frequency standards
• frequencies
• the optical frequency comb
• the optical clocks

Location

Teddington

Description

Comparison of optical frequency standards is essential for verifying that the clocks both locally and remotely at other national metrological institutes all agree to within their quoted uncertainties. These quoted uncertainties can be as low as ~1e-18, and so agreement between multiple clocks all operating at this level is required to verify that uncertainty. Remote clock comparisons at NPL, or between NPL and other European NMIs, are only possible at this uncertainty using optical frequency combs and telecoms optical fibre links to compare and transmit frequencies over long distances. By using an optical frequency comb with the full flexibility to cover the 500 nm to 2000 nm wavelength range, the infrastructure will be in place to enable any of the likely candidates for an optical representation of the SI second to be compared over a short cross-site fibre link. The optical frequency comb will also require dedicated branches to link with the optical clocks and oscillators already available at NPL, these include the Sr+ at 674 nm, the Sr lattice at 698 nm, the Yb+ clocks at both 871 nm and 934 nm, and an ultrastable laser at 1064 nm.

Total Quantity or Scope

An optical frequency comb for comparison of optical clocks over a short fibre link Qty: 1

Award Detail

Award Criteria

CPV Codes

• 38000000 - Laboratory, optical and precision equipments (excl. glasses)

Indicators

• Award on basis of price.

Legal Justification

Proposed procurement was very similar to the competitive tender purchase of Frequency Combs previously conducted by T&F/OFM earlier in 2021 and again in 2023, which were purchased to equip state-of-the-art test and evaluation laboratories both in Teddington and in Glasgow. Because of this, OFM have now installed and commissioned several of these systems and invested a substantial amount of time in developing a full understanding of the system. At the time of the previous procurements, the Menlo system was evaluated to provide the most appropriate solution to the T&F needs by far. By purchasing a similar system from the same supplier, the embedded expertise in this system can be exploited, and subsequently interoperability of systems can be developed. Based on the specification from the previous tender processes, the systems from other two bidders were found to be the only ones capable of demonstrably meeting the repetition rate tunability and the required flexibility in a turn-key system. None of the alternative suppliers could guarantee or demonstrate the specification at the required level. Menlo systems scored high on demonstrated performance systems integration and service. Since we have tested the market twice in the past few years with the same outcome, we are confident that Menlo Systems is the only provider that can meet the expected requirements for our purposes.