Hybrid cryogenic-cavity plus chip-scale Brillouin laser delivers <1 Hz linewidth and 0.2 Hz²/Hz noise above 10 MHz, enabling sub-Hz spectroscopy in a 3D 87Sr clock.
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Ultra-Low-Noise Brillouin Hybrid Synthetic Laser for Sub-Hertz Lattice Clock Spectroscopy
Hybrid cryogenic-cavity plus chip-scale Brillouin laser delivers <1 Hz linewidth and 0.2 Hz²/Hz noise above 10 MHz, enabling sub-Hz spectroscopy in a 3D 87Sr clock.