Why is it not possible to produce electromagnetic waves in the visible region with modern electronic circuits in the laboratory ? (2009)

If you notice the frequency of an EMWave in the Visible region, it is of the order of 1014 Hz, while modern oscillators can barely create frequencies of 1011 Hz. Therefore, modern circuits cannot create Visible EMWaves.  However, a Photo - Emitting Diode works on a different principle, which enables it to generate visible light.
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What is the method of production of x- rays
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What is the method of production of x rays
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X rays can be produced by bombarding metal with high speed beam of electrons .
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