I present the first results of the GammeV experiment at Fermilab, a
search for oscillations of laser photons into axion-like particles
similar to one that had previously been performed at BNL.  With our
new apparatus, we are able to quickly cover a region of parameter
space not previously excluded by the BNL experiment, and test the
particle interpretation of the recent anomalous PVLAS signal.  I will
also discuss the second stage of the experiment, a search for
mass-varying chameleon particles.