A 'digital decoherence' scheme that arithmetically combines short-delay phase measurements mimics very long delay self-heterodyne interferometry, enabling sub-hertz linewidth measurement with broad wavelength compatibility.
Ultrastable Silicon Cavity in a Continuously Operating Closed-Cycle Cryostat at 4 K,
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High-precision laser spectrum analyzer via digital decoherence
A 'digital decoherence' scheme that arithmetically combines short-delay phase measurements mimics very long delay self-heterodyne interferometry, enabling sub-hertz linewidth measurement with broad wavelength compatibility.