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On 21/06/2024 14:05, john larkin wrote:He published first though. ;)There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
More interesting still nature beat him to it.
Date | Sujet | # | Auteur | |
21 Jun 24 | how the laser happened | 46 | john larkin | |
21 Jun 24 | Re: how the laser happened | 27 | Cursitor Doom | |
21 Jun 24 | Re: how the laser happened | 26 | john larkin | |
21 Jun 24 | Re: how the laser happened | 2 | Cursitor Doom | |
22 Jun 24 | Re: how the laser happened | 1 | john larkin | |
22 Jun 24 | Re: how the laser happened | 23 | Jan Panteltje | |
22 Jun 24 | Re: how the laser happened | 22 | Cursitor Doom | |
23 Jun 24 | Re: how the laser happened | 21 | Jan Panteltje | |
23 Jun18:39 | Re: how the laser happened | 20 | Cursitor Doom | |
23 Jun18:45 | Re: how the laser happened | 19 | john larkin | |
23 Jun19:07 | Re: how the laser happened | 2 | Cursitor Doom | |
23 Jun19:26 | Re: how the laser happened | 1 | john larkin | |
23 Jun20:08 | Re: how the laser happened | 16 | Phil Hobbs | |
23 Jun22:12 | Re: how the laser happened | 1 | Cursitor Doom | |
23 Jun22:38 | Re: how the laser happened | 14 | john larkin | |
24 Jun00:09 | Re: how the laser happened | 12 | Phil Hobbs | |
24 Jun02:05 | Re: how the laser happened | 11 | john larkin | |
24 Jun02:22 | Re: how the laser happened | 10 | Phil Hobbs | |
24 Jun06:34 | Re: how the laser happened | 5 | john larkin | |
24 Jun18:47 | Re: how the laser happened | 4 | Phil Hobbs | |
24 Jun22:13 | Re: how the laser happened | 3 | john larkin | |
25 Jun01:02 | Re: how the laser happened | 1 | Phil Hobbs | |
26 Jun15:53 | Re: how the laser happened | 1 | Bill Sloman | |
24 Jun22:22 | Re: how the laser happened | 4 | Joe Gwinn | |
25 Jun00:02 | Re: how the laser happened | 3 | john larkin | |
25 Jun09:55 | Re: how the laser happened | 2 | Jeroen Belleman | |
25 Jun17:14 | Re: how the laser happened | 1 | john larkin | |
24 Jun08:24 | Re: how the laser happened | 1 | Bill Sloman | |
24 Jun22:45 | Re: how the laser happened | 2 | Lasse Langwadt | |
25 Jun01:09 | Re: how the laser happened | 1 | Phil Hobbs | |
25 Jun12:50 | Re: how the laser happened | 16 | Martin Brown | |
25 Jun13:51 | Re: how the laser happened | 1 | Phil Hobbs | |
25 Jun17:19 | Re: how the laser happened | 11 | john larkin | |
25 Jun20:40 | Re: how the laser happened | 1 | Jeff Liebermann | |
25 Jun23:43 | Re: how the laser happened | 8 | Joe Gwinn | |
26 Jun00:41 | Re: how the laser happened | 6 | john larkin | |
26 Jun15:41 | Re: how the laser happened | 1 | Bill Sloman | |
27 Jun04:49 | Re: how the laser happened | 4 | Phil Hobbs | |
27 Jun05:07 | Re: how the laser happened | 3 | john larkin | |
27 Jun16:04 | Re: how the laser happened | 2 | Joe Gwinn | |
27 Jun18:26 | Re: how the laser happened | 1 | john larkin | |
26 Jun06:04 | Re: how the laser happened | 1 | Bill Sloman | |
26 Jun05:55 | Re: how the laser happened | 1 | Bill Sloman | |
25 Jun20:09 | Re: how the laser happened | 3 | Jeroen Belleman | |
25 Jun22:46 | Re: how the laser happened | 2 | Phil Hobbs | |
25 Jun23:20 | Re: how the laser happened | 1 | Jeroen Belleman |
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