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The influence of energy transfer upconversion on Q-switched single resonator optical parametric oscillator

The influence of energy transfer upconversion on Q-switched single resonator intracavity optical parametric oscillator is investigated by a space-dependent rate equation model. The numerical analysis shows that the energy transfer upconversion effect causes the pump size to have an optimum for yielding the largest output power at a given pump power. To verify the presented model, the practical example of Q-switched Nd : YVO4—KTA single resonator intracavity optical parametric oscillator has been used. The optimum pump size, calculated by presented model is 320 μm which is reported 300 μm.