Can you make a laser using radio waves at 10 km wavelength?

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jonthebaptist
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I am merely getting curious in thinking about building a radio-wave laser. I'm not seriously pursuing this, but I think it would be cool to build a laser that is ~10km in length. Is anyone aware of any research into this type of monstrosity? Any thoughts about the feasibility or the potential applications?
 
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What do you mean by "radio-wave"?
Are you referring to the frequency?
If so, this is known as a maser (the m is for microwave) and they have been around for even longer than lasers.