Micro-cavity length stabilization for fluorescence enhancement using schemes based on higher order spatial modes

TL;DR

This paper demonstrates a micro-cavity length stabilization method using higher-order spatial modes, achieving high stability and significantly reducing photon leakage, which benefits fluorescence detection in quantum emitter applications.

Contribution

The study introduces a novel stabilization scheme based on higher-order modes for micro-cavities, enhancing stability and reducing photon leakage for quantum fluorescence detection.

Findings

Achieved 0.5 pm RMS stability in micro-cavity length.

Suppressed leakage photons by over 100-fold.

Validated effectiveness for quantum emitter-cavity systems.

Abstract

We report on experimental investigation of potential high-performance cavity length stabilization using odd-indexed higher-order spatial modes. Schemes based on higher-order modes are particularly useful for micro-cavities that are used for enhanced fluorescence detection of a few emitters, which need to minimize photons leaking from a stabilization beam. We describe the design and construction of an assembly for a microcavity setup with tunable high passive stability. In addition, different types of active stabilization techniques based on higher-order modes, are then implemented and characterized based on their performance. We achieved a stability of about 0.5 pm RMS, while the error photons leaking from the continuous locking beam to a fluorescence detector are suppressed by more than 100-fold. We expect these results to be important for quantum technology implementations of various emitter-cavity setups, where these techniques provide a useful tool to meet the highly challenging demands.