A new electro-optic system is developed to probe microwave signals on nonlinear crystals. The method uses two narrow linewidth solid state continuous wave (cw) lasers. The beat frequency between the two cw lasers is set equal to the microwave frequency plus a few MHz. The wave mixing between the beat frequency and the microwave signal is used to down convert the high frequency signal from the GHz to the MHz range where it is treated and displayed. The actual frequency bandwidth of the method is limited by the excursion between the two lasers (in our case, 50 GHz).
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Loualiche et al. (1992) studied this question.
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