We are searching for the coherent production of light pseudoscalar or scalar particles in a 12-m optical cavity placed in a 5-T transverse magnetic field. From the level of the observed optical rotation we have set a limit on the coupling of such particles to two photons, ${\mathit{g}}_{\mathit{a}\gamma \gamma }$<2.5×${10}^{\mathrm{-}6}$ ${\mathrm{GeV}}^{\mathrm{-}1}$, provided ${\mathit{m}}_{\mathit{a}}$≲7×${10}^{\mathrm{-}4}$ eV.

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