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(-5) and 10(-2) electron volts for a mixing parameter greater than 10(-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(-6) GeV-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.