  The PVLAS collaboration has observed rotation of the plane of polarization of
light passing through a magnetic field in vacuum and has proposed that the
effect is due to interaction of photons with very light spin-zero bosons. This
would represent new physics beyond the Standard Model, and hence it is of high
interest to test this hypothesis. We describe a proposed test of the PVLAS
result, and ways of producing, detecting, and studying such bosons with light
in the optical frequency range. Novel features include methods for measurements
of boson mass, interaction strengths, and decay- or oscillation-lengths with
techniques not available in the x-ray region.
