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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.

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In this paper, the influence of temperature on the intracavity optical parametric oscillator (IOPO) is investigated by using the stimulated temperature-dependent emission cross section of laser crystal. The rate equations under plane wave approximation have been used for simulation of signal output pulse. Results show that the signal output pulse width is decreased by increasing the laser crystal temperature. Also, the signal output energy is increased by the increasing of the laser crystal temperature. The simulation results for IOPO based on Nd:YAG and Nd:YVO 4 , show that the signal pulse energies are increased by 3.2 and 5.6 times respectively when the laser crystal temperature increased from 15 • C to 300 • C. The presented model indicates that the temperature sensitivity of Nd:YVO 4 -based IOPOs is more than that of Nd:YAG-based IOPOs which is expected from a physical point of view.