Conversion of NIR laser source light into light in the green-blue spectral range can be carried out by using SHG, also known as frequency doubling techniques, a technology generally known in the laser-based optical industry. A reasonable goal for single-pass conversion efficiency is that it should be in ~25% range to avoid excessive laser cost. Conversion efficiency is proportional to input power, the square of the effective nonlinear coefficient of the nonlinear element (crystal) and the length of the nonlinear element.
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As crystal length is increased, conversion efficiency increases, but the frequency doubling process becomes more sensitive to changes in temperature, strain and other factors affecting the uniformity of the refractive index of the nonlinear element. As a result, length alone cannot be used to compensate for an element’s low nonlinearity. Therefore, the material with the maximum non-linear coefficient should be used to enhance the efficiency of conversion. (others apparently still are in love with Lola) http://youtube.com/watch?v=VFo1jmvX7SM