Is it possible to produce light waves using electronic oscillators or other devices?

Question

Radio waves can be generated using oscillating current. And I am wondering whether it is possible to change the properties of current to produce shorter wavelengths like light waves or not.

I'm not asking about the possibility of doing this practically. But rather whether it is theoritically possible or impossible.

Please answer briefly and directly to the point - is that possible or not?

Of course it is possible. But conventionally, would require a very small antenna (in the same order of the wavelength). — Physicist137, Nov 05 '15 at 21:06
Possible duplicate of Radio antenna producing waves in the visible spectrum — John Rennie, Nov 06 '15 at 07:29

score 1 · Answer 1 · answered Nov 05 '15 at 23:00

The answer is yes. There are hundreds of facilities all over the world called synchrotron radiation sources where electromagnetic radiation with different wavelengths (ranging from IR to hard X-rays) is produced by circulating electric currents. However, I would not call them antennas.

Is it possible to produce light waves using electronic oscillators or other devices?

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