Cyclic variation of output energy with ambient temperature changes in intracavity KTP frequency-doubling laser

We have investigated the relationship between output energy of intracavity-frequency-doubling KTP laser and ambient temperature by solving thermo-optic dispersion equations. An electro-optic Q-switched intracavity-frequency-doubling laser is efficiently realized. By controlling temperature in temperature control box, output energy's extinction characteristic observed in the experiment is different from the result of solving dispersion equations, which is explained by theory of polarization interference principle. The result shows that the envelope distribution of output energy is due to phase mismatch caused by temperature change, and extinction phenomenon is caused by polarization interference. The experimental result is in good agreement with the theoretical analysis.