Low noise near-concentric optical cavity design.

Area of Science:

• Atomic, Molecular, and Optical Physics
• Quantum Optics
• Cavity Quantum Electrodynamics (Cavity-QED)

Background:

• Near-concentric cavities offer small mode volumes and large optical access for atom-light interaction enhancement.
• These cavities are highly sensitive to longitudinal and transverse misalignments, limiting their practical application.
• Improving cavity stability is crucial for advancing cavity-QED and atom-light interaction studies.

Purpose of the Study:

• To present a compact near-concentric optical cavity system designed to overcome misalignment sensitivity.
• To demonstrate a novel mirror support structure for precise alignment correction.
• To enable enhanced atom-light coupling for cavity-QED applications.

Main Methods:

• Implementation of a cage-like tensegrity mirror support structure.
• Characterization of the optical cavity system, measuring residual cavity length variation.
• Design and construction of a compact near-concentric optical cavity.

Main Results:

• Achieved a residual cavity length variation of δLC,rms = 0.36(2) Å, indicating high stability.
• The tensegrity support structure effectively corrects for longitudinal and transverse misalignments.
• The system's stability allows for the use of higher finesse mirrors.

Conclusions:

• The developed compact near-concentric cavity system significantly reduces sensitivity to misalignments.
• This advancement facilitates stronger atom-light coupling, benefiting cavity-QED research.
• The system provides a stable platform for future investigations in atom-light interactions.