July 2018
Spotlight Summary by Stéphane Schilt
Downsampling of optical frequency combs
Downsampling of the repetition rate of optical frequency combs by pulse gating is reported in this paper as a powerful means to reduce the repetition rate and subsequently increase the pulse energy of a laser pulse train. This enables efficient spectral broadening and f-to-2f interferometry to be achieved with laser systems for which it would be impossible with their initial repetition rate at the same average optical power.
The method is attractive for use with emerging high repetition rate laser systems that can lead to a new class of very compact frequency combs. Hence, it has recently been used to detect the carrier-envelope offset frequency of a 10 GHz comb from a micro-resonator. In a detailed theoretical and experimental analysis presented in this article, the authors demonstrate that the downsampling process does not affect the noise properties of the comb and that the carrier-envelope offset frequency is preserved down to the observable level of several microhertz, even with jitter on the gate signal.
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The method is attractive for use with emerging high repetition rate laser systems that can lead to a new class of very compact frequency combs. Hence, it has recently been used to detect the carrier-envelope offset frequency of a 10 GHz comb from a micro-resonator. In a detailed theoretical and experimental analysis presented in this article, the authors demonstrate that the downsampling process does not affect the noise properties of the comb and that the carrier-envelope offset frequency is preserved down to the observable level of several microhertz, even with jitter on the gate signal.
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Article Information
Downsampling of optical frequency combs
Daniel C. Cole, Scott B. Papp, and Scott A. Diddams
J. Opt. Soc. Am. B 35(7) 1666-1673 (2018) View: Abstract | HTML | PDF