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A stable fiber laser operating at appro ximately 976 n m peak power at a 280 ns and 1.9 W pump was used as a pumping source for an upconversion laser based on an Er 3+ :doped LiLuF4 crystal. A 548 n m wavelength and 320 mW could be achieved. In this study, we used a 976 n m lo w threshold average pump power fiber laser at 8 mW, wh ich can achieve green upconversion laser output at room temperature. Th is system includes a high reflective coating at 552 n m+/-10 n m on the LiLuF4 crystal and a 96% reflective mirror forming a laser cavity fo r the 548 n m laser. Using the laser cavity setup and 976 n m fiber laser pu mp, lo w threshold pump power green erbiu m upconversion lasing was achieved. The two peak wavelengths of 548 n m and 537 n m are observed and the intensity changes by changing the input to 976 n m pu mp power.

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