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 $(1\times {10}^{-15}\mathrm{at}1\mathrm{s})$. The laser is further characterized by resolving a $2\mathrm{Hz}$ wide, ultranarrow optical clock transition in ultracold strontium.

© 2007 Optical Society of America

Compact, portable, thermal-noise-limited optical cavity with low acceleration sensitivity

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