Improving the resolution of comb-based frequency measurements using a track and hold amplifier

• DOI: 10.48550/arxiv.2205.14150
• Publication Date: 2022-01-01
• Authors: Matias Risaro; Paolo Savio; Marco Pizzocaro; Filippo Levi; Davide Calonico; Cecilia Clivati
• Keywords: Comb filter

The advent of optical frequency standards with ultimate uncertainties in the low 1x10$^{-18}$ requires femtosecond combs to support a similar level resolution spectral transfer and computation ratios. related experimental challenges grow together number frequencies be measured simultaneously, as many cases comb's power does not allow reliable beatnote counting or tracking all regions interest. Here we describe use track-and-hold amplifier implement gated detection, previously proposed technique for improving signal-to-noise ratio between low-power tooth comb continuous wave laser. We demonstrate 12dB improvement beatnotes involving broadband-spanning compared traditional detection schemes. Our approach enables cycle-slip-free purity reduces system sensitivity drops spectrum. Being based on single chip, it is robust, versatile easily embedded more complex Keywords: comb, transfer, track hold amplifier.