Abstract

We demonstrate phase and frequency stabilization of a diode laser at the thermal noise limit of a passive optical cavity. The system is compact and exploits a cavity design that reduces vibration sensitivity. The subhertz laser is characterized by comparison with a second independent system with similar fractional frequency stability (1×1015at1s). The laser is further characterized by resolving a 2Hz wide, ultranarrow optical clock transition in ultracold strontium.

© 2007 Optical Society of America

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