Frequency-comb spectral interferometry achieves 0.67 nm single-shot precision at 25 microseconds and 4.5e-12 m/Hz^1/2 sensitivity, close to the detector shot-noise limit.
Gao, et al., Measurement technologies for precision positioning
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Approaching the quantum-limited precision in frequency-comb-based spectral interferometry for length measurements
Frequency-comb spectral interferometry achieves 0.67 nm single-shot precision at 25 microseconds and 4.5e-12 m/Hz^1/2 sensitivity, close to the detector shot-noise limit.