Abstract
We are introducing here conversion of eye hazardous laser to the eye safe region by Optical Parametric Os- cillation (OPO) method, using nonlinear optical crystals. The practical optical parametric oscillator device consists of a nonlinear crystal enclosed in an optical resonant cavity pumped by Nd:YAG laser. Optical parametric devices generate broadly tunable coherent optical radiations by the phase-matching nonlinear optical interaction of an intense laser beam with this nonlinear crystal. In this process the high energy pump photon is converted into a pair of lower frequency signal and idler photons while conserving the total energy and momentum. Tunability of the signal-idler pair is usually achieved by changing the crystal birefringence of the angular dependence of the extraordinary index of the nonlinear crystal. The output energy is an eye safe radiation at either, or both the signal and idler wavelengths.
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