Clocks

Next generation frequency standards stabilized to atomic transitions.

Complete clocks, including physics package, auxiliary lasers and electronics,
and frequency comb for optical and RF outputs.
Based on SLS ultra-stable frequency stabilized laser systems.
19″ rack mounted.
Metrology grade clocks as developed and used in clock comparisons at NRC, PTB,
and NPL.

STRONTIUM ION OPTICAL CLOCK

High-accuracy optical frequency standard locked to the 674nm ²S _{1/2 –} ² D_5/2 clock transition of a single trapped ⁸⁸Sr⁺ ion. Among available trapped ion species, ⁸⁸Sr⁺ has a convenient level structure with accessible wavelengths for cooling and clock probes, leading to a robust system.

Cavity-stabilized 1348nm laser, frequency doubled and locked to the 674nm clock transition, with direct IR output for frequency-comb down-conversion.
Two-point-probe self-comparison approaching quantum projection noise limit of around 4×10^-15/√τ.
Accuracy <1×10^-15 estimate based on uncertainty characterization estimates: full uncertainty will be characterized by Spring 2026.
Minimal laser count for robustness and high up time.
Low blackbody radiation shift and uncertainty.
Custom FPGA-based pattern generator and low-noise ion trap electronics.