Abstract
Ultra stable frequency references such as the ones used in optical atomic clocks and for quantum metrology may be obtained by stabilizing a laser to an optical cavity that is stable over time. State-of-the-art frequency references are constructed in this way, but their stabilities are currently limited by thermally induced length fluctuations in the reference cavity. Several alternative approaches using the potential for frequency discriminating of highly forbidden narrow atomic transitions have been proposed in, e.g., [1] and [2]. In this proceeding we will present some of the ongoing experimental efforts derived from these proposals, to use cavity-enhanced interaction with atomic 88Sr samples as a frequency reference for laser stabilization. Such systems can be realized using both passive and active approaches where either the atomic phase response is used as an error signal, or the narrow atomic transition itself is used as a source for a spectrally pure laser. Both approaches shows the promise of being able to compete with the current state of the art in stable lasers and have similar limitations on their ultimately achievable linewidths [1, 2].
Highlights
Ultra stable frequency references such as the ones used in optical atomic clocks and for quantum metrology may be obtained by stabilizing a laser to an optical cavity that is stable over time
State-of-the-art frequency references are constructed in this way, but their stabilities are currently limited by thermally induced length fluctuations in the reference cavity
Quantum metrology and ultra-stable optical atomic clocks rely on the frequency stability of reference lasers [3, 4, 5]
Summary
Quantum metrology and ultra-stable optical atomic clocks rely on the frequency stability of reference lasers [3, 4, 5]. When operated as a laser in the bad cavity regime, can the emission rate be significantly increased, the laser linewidth can experience a further spectral narrowing compared to the natural linewidth [2, 12, 13] These effects arise if one considers the case of superradiant or superfluorescent emission of light. The atoms have a strong collective coupling to a single cavity mode, significantly enhancing their collective cooperativity, and allowing them to emit a burst of photons into the cavity mode In this approach the atoms act as the active part of the laser allowing enhanced emission intensity on a narrow atomic transition. Before delving into the specifics of the passive and active approach respectively we will characterize the experimental system under investigation, which is common to the two cases
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