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Based on periodically poled lithium niobate (PPLN), a mini intracavity optical parameter oscil lator (IOPO) driven by an diode end pumped composite Nd 3+ :YAG/Cr 4+ :YAG laser was demonstrated. The PPLN wafer has 20 domain reversal periods from 27.8 to 31.6 µm with a step of 0.2 µm between the neighbor periods. The output signal laser of OPO can be widely tunable in the range of 1402-1676 nm by changing the period at a certain temperature of 50°C. Under the diode pump power of 14 W, the maximum average output power of 600 mW at 1534 nm with pulse width of 2.0 ns and repetition rate of 16 kHz was obtained, corre sponding to a peak power of 18.7 kW and a single pulse energy of 37.5 µJ, respectively.

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