Temporal behavior of an unstable optical cavity.

Area of Science:

• Optics and Photonics
• Cavity Quantum Electrodynamics
• Laser Physics

Background:

• Fabry-Perot cavities are fundamental optical resonators.
• Understanding cavity relaxation dynamics is crucial for laser design and quantum optics.
• Geometrical instability can significantly alter standard cavity behavior.

Purpose of the Study:

• To investigate the relaxation dynamics of geometrically unstable Fabry-Perot cavities.
• To analyze deviations from traditional exponential decay models.
• To explore light coupling mechanisms into the fundamental mode under non-ideal conditions.

Main Methods:

• Theoretical modeling of cavity relaxation.
• Experimental investigation using optical measurements.
• Analysis of transverse mode behavior and intensity decays.

Main Results:

• Observed complex relaxation behavior instead of simple exponential decays.
• Demonstrated light coupling into the fundamental mode with excitation factors greater than unity.
• Isolated the influence of cavity Fresnel number and mode crossings/anticrossings on decay dynamics.

Conclusions:

• Geometrical instability fundamentally changes Fabry-Perot cavity relaxation.
• Non-unity excitation factors can lead to enhanced fundamental mode coupling.
• Cavity parameters like Fresnel number and mode interactions are critical determinants of decay characteristics.