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Enhancement Cavities in Photonics

Overview

An enhancement cavity is an optical resonator used to enhance optical power or intensity through resonance. This technology is commonly employed for efficient nonlinear frequency conversion in photonics applications.

Functionality

Enhancement cavities work by resonating with incident light, allowing for a significant increase in intracavity power compared to the input power. These cavities can be designed as linear or ring resonators, incorporating additional optical elements like nonlinear crystals for processes such as frequency doubling or sum frequency generation.

Resonator Optimization

Software tools like RP Resonator enable the optimization of enhancement cavities by considering factors such as beam incidence angles, crystal alignment, and power enhancement calculations.

Efficient Operation

Efficient operation of enhancement cavities requires precise resonance conditions, mode matching of incoming radiation, and impedance matching to minimize losses. Feedback systems are often employed to maintain resonance over time, especially in high-finesse cavities.

Applications

Enhancement cavities are commonly used with single-frequency and mode-locked lasers for various applications, including high harmonic generation at high pulse repetition rates. These cavities enable the generation of frequency combs and facilitate nonlinear optics experiments.

Challenges

Challenges in using enhancement cavities include managing intracavity dispersion, handling high optical intensities, and mitigating beam distortions. Precise control of cavity parameters is crucial for achieving desired outcomes in photonics research and applications.

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