Abstract

We report an ultranarrow-linewidth laser spectrometer at 657nm, consisting of a diode laser locked in a single stage to a stable high-finesse reference cavity. The system is characterized by comparison with a second independent system. From beat frequency measurements a linewidth below 1.5Hz (FWHM) and a fractional instability of less than 2×1015 for 1s of averaging time are observed.

© 2006 Optical Society of America

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