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CAWO polycrystals with fixed Yb and various Er concentrations are synthesized via the high temperature solid state method.The crystal structure of the polycrystals is characterized by means of x-ray diffraction.The upconversion properties of the polycrystals under the 980 nm excitation are investigated.Intense emission bands centered at 530hm and 552nm correspond to the transitions H → I and S → I of Er, respectively.The dependence of intensity of the green emission on the pump power and possible upconversion mechanism are discussed.Quantitative analysis of dependence of upconversion emission intensity on the pump power of a laser diode indicates that two-photon processes are responsible for both 530hm and 552nm green upconversion emissions.