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Double slit laser experiment Rate Topic: -----

#1 31 January 2012 - 04:46 PM Santalum 


Baryon
When phyicists say that their laser is firing single photons, how do they know that?

How do you verify that it is firing a single photon and not a small cluster of photons?
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#2 31 January 2012 - 05:33 PM User is online  swansont 


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View PostSantalum, on 31 January 2012 - 04:46 PM, said:

When phyicists say that their laser is firing single photons, how do they know that?

How do you verify that it is firing a single photon and not a small cluster of photons?


Attenuate the signal so that the number of transmitted photons is sufficiently small, e.g. if you are emitting 10^10 photon/sec, you attenuate by more than 10 orders of magnitude. You can do single-photon detection to confirm that you have single photons.
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#3 31 January 2012 - 11:19 PM Santalum 


Baryon

View Postswansont, on 31 January 2012 - 05:33 PM, said:

You can do single-photon detection to confirm that you have single photons.

How do you do that?
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#4 1 February 2012 - 10:23 AM User is online  swansont 


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http://en.wikipedia....avalanche_diode is one way
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#5 1 February 2012 - 10:46 AM Santalum 


Baryon

View Postswansont, on 1 February 2012 - 10:23 AM, said:

http://en.wikipedia....avalanche_diode is one way



I take it the amperage/voltage of the cascade current gives a measure of the number of photons that 'hit' it?
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#6 1 February 2012 - 12:37 PM User is online  swansont 


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View PostSantalum, on 1 February 2012 - 10:46 AM, said:

I take it the amperage/voltage of the cascade current gives a measure of the number of photons that 'hit' it?

Right.
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