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 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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