I have tried to find a laser with working frequency at megahertz by Google but failed. Is there exist one?
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$\begingroup$ There are antennas operating in MHz - GHz range, for more radiation directivity such as in laser, one might use a horn antenna or phased array. $\endgroup$– Pierre PolovodovCommented Feb 3, 2023 at 12:30
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1$\begingroup$ Why would you want a laser? Spectral purity and long coherence length - normal rf sources can do it. Power - you can get powerful rf sources using normal electronics $\endgroup$– CryoCommented Feb 3, 2023 at 12:37
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$\begingroup$ Thanks ! Do you mean phased array can not only collect but also radiate high directivity EM wave, Pierre Polovodov? $\endgroup$– HunterCommented Feb 3, 2023 at 16:14
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Given the frequency range, it cannot be called laser (light amplification via stimulated emission of radiation), since the frequency is not in the optical range (see electromagnetic spectrum)... it can even hardly be called maser (microwave amplification via stimulated emission of radiation), since it is not in the microwave range... so the best would be to google for radio frequency amplification via stimulated emission or quantum generator of radio waves or something like that.
Related:
Quantum description of radio antenna
Does a radio receiver "collapse" a radio wave function?
Remark:
The way I understand the question is that we are talking not simply about absorption and emission of radio frequency photons on a quantum level, but about a laser-like devices - i.e., amplification of these photons via stimulated emission and possibly also their emission as a free field. Already in microwave range, the small frequency of the photons (compared to room temperature) requires using cryogenic technology and confining photons to waveguides (possibly superconducting waveguides.) See, e.g., The bright side of Coulomb blockade.
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$\begingroup$ This question might also be of help: Lightest photon ever detected $\endgroup$– MauricioCommented Feb 3, 2023 at 12:28
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$\begingroup$ Laser is used for for frequencies not in the visible range as shown specifically in your linked wiki. You can see this directly in one image showing a wide variety of lasers along with their location on the spectrum. Man of which lie outside it. $\endgroup$ Commented Feb 3, 2023 at 17:42
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$\begingroup$ @Triatticus I didn't say that laser emits visible light - it is a generator in the optical range, which has higher frequencies thanmicrowave range, which are in turn higher than radio frequencies. $\endgroup$– Roger V.Commented Feb 3, 2023 at 17:56