Weakly Interacting Sub-eV Particle Searches
We make use of the generation-regeneration or 'light shining through a wall' technique in searches for optical-wavelength photons mixing with hypothetical hidden-sector paraphotons in the mass range between 10{sup -5} and 10{sup -2} electron volts for a mixing parameter greater than 10{sup -7} and in sensitive searches for scalar and pseudoscalar coupling of photons to light neutral bosons in the mass range of approximately 1.0 milli-electron volts and coupling strength greater than 10{sup -6} GeV{sup -1}. Additionally, there is an effort underway to use photons in the microwave region using this same technique to make a more sensitive measurement in the mass range of approximately 0.1 milli-electron volts. The equipment in the latter effort will be used to search for galactic halo axions in this same mass range.