Effects of a Cylindrical Cavity on the Etendue of a Light Source

@article{Lee2011EffectsOA,
  title={Effects of a Cylindrical Cavity on the Etendue of a Light Source},
  author={Ui-Hyung Lee and Young‐gu Ju},
  journal={Japanese Journal of Applied Physics},
  year={2011},
  volume={50},
  pages={122501}
}
This paper proposes that the cylindrical cavity around a circular light source can decrease the divergence angle without changing the emission energy and source size. This result can provide a way to reduce the etendue of the light source by scrambling the rays inside the cavity with a lossless scattering surface. The experiment demonstrated that the metallic cavity around the surface source reduced the divergence angle. However, the metallic surface also absorbed quite a large portion of the… 
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