Coherence Effects in Long-Wavelength Infrared Synchrotron Radiation Emission

Abstract

We report measurements of synchrotron radiation emission in the wavelength region from 30 to 400 μm where coherent enhancement was predicted. The power ratio relative to a blackbody source exhibits no such enhancement and can be accounted for by the incoherent emission theory. This discrepancy is explained by showing that the coherent enhancement is reduced when proper account is taken of the relative phases of all emitting particles.