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We discuss the experimental techniques used to date for measuring the changesin polarization state of a laser produced by a strong transverse magnetic fieldacting in a vacuum. We point out the likely artifacts that can arise in suchexperiments, with particular reference to the recent PVLAS observations and theprevious findings of the BFRT collaboration. Our observations are based onstudies with a photon-noise limited coherent homodyne interferometer with apolarization sensitivity of 2x10^-8 rad Hz^(1/2) mW^(-1/2).

Experimental Challenges Involved in Searches for Axion-Like Particles and Nonlinear Quantum Electrodynamic Effects by Sensitive Optical Techniques