Could LED array realize light's beam forming like antenna 's beam-forming?

[xymhao]

Hello!Everyone. Help me!
Could LED array realize light's beam forming like antenna 's beam-forming?

 

[tony_lth]

Good question.
Antenna beams are correlate in phase.
Can you make LED light correlate in phase?

 

[xymhao]

Good question.
Antenna beams are correlate in phase.
Can you make LED light correlate in phase?

Now,I haven't idea about how to realize LED light correlate in phase.Do you have some suggestion?

 

[betwixt]

Interesting question.

Maybe, the light has to be a pure single wavelength so it might be possible using LASER diodes. The difference with antennas is you provide the signal to drive them, an LED produces it's own signal.

Brian.

 

[xymhao]

Interesting question.

Maybe, the light has to be a pure single wavelength so it might be possible using LASER diodes. The difference with antennas is you provide the signal to drive them, an LED produces it's own signal.

Brian.

Thank you for your suggestion. I don't know how to correlate in phase.Could it realize by using different time delay's signal to drive LED ?

 

[chuckey]

A laser diode is a self contained oscillator, you might be able to change its phase by changing the voltage across it. I suggest you Google for data sheets for laser diodes. You can also modulate the phase by allowing to pass through a variable thickness lens, as the light going through the lens will be retarded. You could try doing some research on fibre optic driver lasers.
Frank

 

[betwixt]

I agree with Frank. You certainly couldn't do it by delaying the electrical signal to the LASER because it would simply produce it's own phase whenever the power was applied. In an antenna, you provide a single phase signal and control the phase feeding different elements by using different feeder lengths, a LASER is it's own signal source though.

I have doubts about whether beam forming is a practical proposition anyway, given that a lens achieves the same thing but if there was another way to align the beam(s) I think it would also have to be optical.

Brian.

 

[jiripolivka]

Please read something about the physics of an LED. LEDs generate a noisy light output, so there is no way to achieve a phase correlation like in antenna arrays. Even lasers do not allow such a thing. You would have to build a laser array on a chip, with spacings of ~ one wavelength (e.g. 600 nanometers) to possibly get them to radiate with a degree of coherence.

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The idea above may be tried with nano-lasers; go ahead!