Abstract

An extended-cavity diode laser operating in the Littrow configuration emitting near 657  nm is stabilized through its injection current to a reference cavity with a finesse of more than 105 and a corresponding resonance linewidth of 14  kHz. The laser linewidth is reduced from a few megahertz to a value below 30  Hz. The compact and robust setup appears ideal as a portable optical frequency standard that uses the calcium intercombination line.

© 2001 Optical Society of America

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