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MIT Used a Laser to Transmit Audio Directly Into a Person ...
https://futurism.com/the-byte/laser-beam-speech-mit#:~:text=Scientists%20have%20figured%20out%20how%20to%20use%20a,breakthrough%20for%20the%20future%20of%20audio%20and%20communication.
Transmission of Stereo Audio Signals with Lasers
https://scholarworks.uark.edu/cgi/viewcontent.cgi?article=1030&context=eleguht
With the original analog audio signal in a digital form, it may be transmitted with a laser. This process requires a fast-switching BJT or MOSFET driver that is capable of switching at the frequency of the carrier signal. The laser driver and laser beam pulse for different lengths of time as shown in the bottom plot of Figure 2.
How to Transmit Audio With a Laser Pen: 11 Steps (with ...
https://www.wikihow.com/Transmit-Audio-With-a-Laser-Pen
Connect the 1,000 ohm side of the transformer between the battery and the laser. The 1,000 ohm side of the transformer has three wires coming from it. We only use the outside two wires. The inside wire is called a center tap and we do not use it in this circuit. Test the laser by attaching the battery. The laser should operate normally at this point.
A Laser Audio Transmitter | Hackaday
https://hackaday.com/2012/08/31/a-laser-audio-transmitter/
Instead of sending radio waves bouncing all over creation, this uses the focused light of a laser to transmit audio. In the image above …
ECE 4760 Final Project: Laser Audio Transmitter
https://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2009/dyz2_jl589/dyz2_jl589/
The first circuit, which is similar to the receiver end, is the laser audio transmission circuit. This transmitter works by modulating the amplitude of the laser based on the amplitude of the audio signal that we are trying to transmit. The audio, which is fed to the circuit through a standard 3.5mm audio jack, is sent to an adder circuit.
Simple and Cheap Laser Digital Audio Transmission : 4 ...
https://www.instructables.com/Simple-and-Cheap-Laser-Digital-Audio-Transmission/
Back to the transmitter. Connect the output of the PAM8403 to the input of the laser driver circuit and the transmitter is done! When fired up, the laser is visually on and no modulation can be optically detected. This actually makes sense as the signal hovers around a 50/50 percent on/off state on a 230 kHz carrier frequency.
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