Optical frequency comb measurements at 633 nm, 674 nm, and 1556 nm

Frequency comb measurements at 633 nm and 674 nm are reported. The absolute frequency of a HeNe/I₂ standard at 633 nm has been monitored and found to vary over a range of approximately 1400 Hz during a period of almost three years. Comb measurements of a travelling HeNe/I₂ standard are in good agreement with measurements performed elsewhere. The frequency of the S-D transition in a single trapped ⁸⁸Sr⁺ ion has been found to be in good agreement with previous classical frequency chain measurements at NRC and comb results obtained elsewhere. Preliminary results are presented for a laser system locked to transitions in acetylene near 1520 nm.