We report novel measurements of the room temperature refractive optical nonlinearities in a molecular beam epitaxy‐grown ZnSe epilayer at frequencies near to the band edge. Time‐resolved changes in the transmission spectrum due to a two‐photon generated plasma of free carriers are monitored with a broad‐band white‐light continuum probe. The refractive index changes, measured for photon energies between 0.8 and 0.05 eV below the free‐exciton line at 2.68 eV, with photoexcited carrier densities of (2–5)×1018 cm−3, are found to be in good agreement with a many‐body plasma calculation.
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