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Under certain conditions Er:YAG crystal can produce 2.94μm laser output.Due to the strong water absorption present in the 2.94 μm spectral region,the laser light sources in medical treatment has the very broad application and development prospect.In this paper,for the demand of new medical laser in medical field,we used the gold-coped copper as a high reflective mirror and the crystals end coating as a output mirror in order to form a high reflection of the laser resonator.