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Updated: Jun 11, 2025

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Prototype optical enhancement cavity for steady-state microbunching.

X Liu¹, X-Y Lu¹, Q-L Tian¹

¹Department of Engineering Physics, Tsinghua University, Beijing 100084, China.

The Review of Scientific Instruments

|October 10, 2024

Summary

This summary is machine-generated.

This study presents a high-finesse optical enhancement cavity for steady-state microbunching (SSMB) light sources. Experimental results validate a power coupling model and demonstrate a cavity with high finesse and low mirror absorption, advancing SSMB technology.

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Area of Science:

Physics
Laser Technology
Accelerator Physics

Background:

Steady-state microbunching (SSMB) offers a high-repetition-rate, coherent radiation source.
The laser modulator, including an undulator and optical enhancement cavity, is crucial for SSMB.

Purpose of the Study:

To describe a high-finesse prototype optical enhancement cavity for SSMB.
To address frequency degeneracy and power coupling challenges in SSMB laser modulators.
To establish and validate a cavity power coupling model.

Main Methods:

Utilized D-shaped mirrors to mitigate modal instability.
Investigated finesse reduction due to high-order mode damping.
Developed a method to estimate mirror absorption coefficients via thermal effects.

Main Results:

Achieved a cavity finesse of 16,518 ± 103.
Estimated an average mirror absorption coefficient of 12 ppm.
Experimental and simulation results for cavity power coupling showed close agreement.

Conclusions:

The developed high-average-power enhancement cavity advances SSMB technology.
Validated cavity power coupling models and mirror absorption estimation methods.
Insights gained are crucial for designing and operating future high-power SSMB systems.