Characterization of optical systems for the ALPS II experiment

Area of Science:

• Particle Physics
• Experimental Optics
• Cosmology

Background:

• The search for weakly interacting sub-eV particles (WISPs) is a key area in modern physics.
• Light-shining-through-a-wall experiments, like ALPS II, aim to detect these elusive particles.
• Resonant enhancement in optical cavities is crucial for boosting WISP production and detection probabilities.

Purpose of the Study:

• To characterize sophisticated optical and control systems for the ALPS II experiment.
• To assess the performance of these systems in a 20 m low-loss optical cavity.
• To ensure the systems meet the stringent requirements for achieving high power buildup factors necessary for ALPS II's design sensitivity.

Main Methods:

• Utilized a 20 m long baseline, low-loss optical cavity.
• Implemented advanced optical and control systems to maintain resonance.
• Characterized power buildup factors and coupling efficiencies.
• Focused on photon to WISP conversion and reconversion probabilities.

Main Results:

• The optical systems were successfully characterized within the 20 m cavity.
• Results indicate the systems' capability to achieve high power buildup factors.
• The performance is discussed in the context of meeting ALPS II's design sensitivity for WISP detection.

Conclusions:

• The characterized optical systems are suitable for the ALPS II experiment.
• The successful setup paves the way for sensitive WISP searches.
• Further optimization of optical systems is essential for maximizing discovery potential.