1940s? The LASER device was invented in 1960. The Soviet spies used an infrared light beam.
replyThe point was light being used for audio, not specifically laser as a light source.
replyYou seem to keep responding to multiple people defend your point, but he used 1320 MHz in the thing which is not light.
replythe words you use matter.
You are completely wrong.
replyHere's what Theremin invented: https://en.wikipedia.org/wiki/The_Thing_(listening_device)
Yes, he invented the technique of monitoring audio through light. How was I wrong there?
replyThe Thing uses a radio signal at 330 MHz (or perhaps a second or third harmonic). These radio waves have a wavelength of about a meter, which is about 6 orders of magnitude longer than an optical wavelength. It's a fundamentally different mechanism than laser Doppler vibrometry.
reply>The theremin is an electronic musical instrument controlled without physical contact by the performer.
replyhttps://en.wikipedia.org/wiki/The_Thing_(listening_device) is a fun read for people who haven't seen it before
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