Abstract
The development of maser sources of intense monochromatic light has opened a new field of experimentation in optics where nonlinear terms in the optical polarizability of transparent piezoelectric materials make possible the generation of optical harmonics <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1,2</sup> and the mixing of light waves having different directions of propagation <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> and freqency. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> In this previous mixing experiments the intense, relatively coherent outputs of optical masers were used. We report here the mixing of a ruby maser signal with spectral lines of a mercury lamp which are quite broad and relatively weak.
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