Reducing the linewidth of a diode laser below 30 Hz by stabilization to a reference cavity with finesse above 10^5

Abstract

An extended cavity diode laser operating in the Littrow configuration emitting near 657 nm is stabilized via its injection current to a reference cavity with a finesse of more than 10^5 and a corresponding resonance linewidth of 14 kHz. The laser linewidth is reduced from a few MHz to a value below 30 Hz. The compact and robust setup appears ideal for a portable optical frequency standard using the Calcium intercombination line.

8 pages, 4 figures on 3 additional pages, corrected version, submitted to Optics Letters

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