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Recent advancements in mobile frequency comb technology and inverse methods are enabling the location and sizing of small methane leaks across large regions.
We discuss concepts related to digital control specifically applied to frequency combs. Applications targeted are spectroscopy, radio-frequency signal generation and time and frequency transfer. A free and open-source digital platform is described in details.
The record of atomic clock frequency comparisons at NIST over the past half-decade provides one of the tightest constraints of any present-day temporal variations of the fundamental constants. Notably, the 6-year record of increasingly precise measurements of the absolute frequency of the Hg+ single-ion optical clock (using the cesium primary frequency standard NIST-F1) constrains the temporal variation...
Highly-nonlinear, germano-silicate fibers can be integrated with femtosecond fiber lasers and generate octave-spanning supercontinuum at 1.5 mum. Post-processing the fibers with ultra-violet radiation allows for tailoring of the continuum properties for frequency metrology applications
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