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There is this statement in the text: "For an ensemble of particles, their thermodynamic temperature is proportional to the variance in their velocity."
In the wikipedia page for thermodynamic temperature (where there is the definition and properties of it) there is no mention of variance of velocity.
Is it a wrong statement or the "thermodynamic temperature" wiki page is incomplete? — Preceding unsigned comment added by 5.14.129.47 ( talk) 07:41, 7 August 2023 (UTC)
We currently have this:
I don't think this is clear enough. The word "thus" joins a sentence about absorbtion with a conclusion about scattering, with no explanation of how the two are related. I don't know enough about the topic to fix this. -- Doradus 13:25, Jun 24, 2005 (UTC)
I agree. I think a much easier-to-understand explanation is possible. ... Hmmm, that ended up being *much* longer than I expected. Feel free to condense it down and post to the article. -- DavidCary 12:46, 26 July 2005 (UTC)
OK, I put my rough draft into the article. -- DavidCary 00:14, 1 December 2005 (UTC)
the Laser Teaching Center at Stony Brook University http://laser.physics.sunysb.edu/projects/ seems to show a lot of people working with "Laser cooling", and with related ideas such as "MOT's" (magneto-optical traps), "Optical tweezers", etc. Should we ask nicely for some photos?
Overall, I think this article is very successful in explaining the basic concepts of laser cooling. I'd like to make a few more minor edits when I have time, especially on the history of the subject, which is subject to a surprising amount of misinformation. Dave Kielpinski 06:08, 18 December 2005 (UTC)
I apologize for the delay responding; I'd missed the original request, then gotten extremely busy. If any of the information in the laser cooling thread in my talk page archives is useful, by all means use it. -- Christopher Thomas 03:54, 8 January 2006 (UTC)
How effective is laser cooling? does it cool fast? can it only cool to ex. 0 celcius, or can it cool to minus degrees too? Are there any real implementations? how much would such a cooling cost? how big would such a cooling device be? Imagine cooling your computer with that. ;) —The preceding unsigned comment was added by Frap ( talk • contribs) on 21:13, 20 May 2006.
The first experimental demonstration of laser cooling in solids (Yb-doped glass) took place in 1995 at Los Alamos National Labs by Epstein et al. Published in Nature, 1995. 64.106.62.179 18:25, 4 September 2007 (UTC)
There is no mention of laser cooling of solids in this article. The first instance I'm aware of this happening was published in: Phys. Rev. Lett. 78,1030 - 1033 (1997)
Since this kind of laser cooling uses an entirely different mechanism (that of anti-stokes fluorescence, should it be made into a separate article?
Since laser cooling of solids is also called "laser cooling", what should we call the page that talks about cooling of solids? Ebudiu 02:28, 29 May 2007 (UTC)
The article says that laser cooling was first demonstrated by Letokhov, Minogin and Pavlik. What is ment by "demonstrated" here? The first experiments that utilized these ideas are experiments performed by Wineland, Drullinger and Walls in 1978 who cooled Mg ions and the same year Neuhauser, Hohenstatt, Toschek and Dehmelt cooled Ba ions. I would think the original poster is talking about this article by Letokov et al but that is a theoretical thesis and doesn't contain any experimental data. The other two papers are here and here. -- ojs ( talk) 13:44, 20 November 2007 (UTC)
Any incident energy on an atom, does not cool an atom, it increments that atoms internal kinetic energy. What happens is that after succesive interactions, the atom reaches a higher internal kinetic state (or lower), where all energy interactions are resolved internally, without any external motion. This is possible, if for example the atom emits two photons in equal and opposite directions at the same time.
Just because an object is motionless within a reference framework does not imply that it is cooler in the sense of colder. Defacto, it is cooler in the sense of, more stable, more controlled, less random in it´s emision and absorbtion, but the atom is defacto, hotter, not colder.
In terms of core-shell beta emission/absortion ratio´s, that also implies that the internal beta emission/absortion would be more stable, and that could imply addicional core stability (or the exact opposite, close to the edge of blowing it´s top). Would that matter? Not if the alpha or neutron emitted cannot leave the core-shell enclosure, and therefore the atom itself, can be said to be in a state of continuous fusion/fission reactions, completely resolved within it´s own space confinement.
(See: single atom plasma fusion/fission processes)
Kabloom: What happened? Sorry sir, apparently that what we thought was pure matter X, had matter Y impurities associated and it blew. — Preceding unsigned comment added by 201.248.124.113 ( talk) 12:05, 2 March 2013 (UTC)
In recent edits Mfpars removed some information, including some equations that purported to explain how laser cooling worked. Mfpars, can you say something more about why you think the article is better without this content?
Thanks for being bold and making changes. Blue Rasberry (talk) 16:22, 9 June 2015 (UTC)
My best guess is that they're doppler cooling the Brownian motion of the chrystal, and waiting for the heat to conduct in from the surrounding liquid, but the publicity blurb is detail-free and doesn't say so. ArthurDent006.5 ( talk) 08:22, 23 November 2015 (UTC)
I'm considering adding an animation to show the reduction of phase space as a function of time. Any thoughts or feedback is welcome before I undertake this. Darth luigi ( talk) 00:35, 13 September 2023 (UTC)
![]() | This article is rated Start-class on Wikipedia's
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There is this statement in the text: "For an ensemble of particles, their thermodynamic temperature is proportional to the variance in their velocity."
In the wikipedia page for thermodynamic temperature (where there is the definition and properties of it) there is no mention of variance of velocity.
Is it a wrong statement or the "thermodynamic temperature" wiki page is incomplete? — Preceding unsigned comment added by 5.14.129.47 ( talk) 07:41, 7 August 2023 (UTC)
We currently have this:
I don't think this is clear enough. The word "thus" joins a sentence about absorbtion with a conclusion about scattering, with no explanation of how the two are related. I don't know enough about the topic to fix this. -- Doradus 13:25, Jun 24, 2005 (UTC)
I agree. I think a much easier-to-understand explanation is possible. ... Hmmm, that ended up being *much* longer than I expected. Feel free to condense it down and post to the article. -- DavidCary 12:46, 26 July 2005 (UTC)
OK, I put my rough draft into the article. -- DavidCary 00:14, 1 December 2005 (UTC)
the Laser Teaching Center at Stony Brook University http://laser.physics.sunysb.edu/projects/ seems to show a lot of people working with "Laser cooling", and with related ideas such as "MOT's" (magneto-optical traps), "Optical tweezers", etc. Should we ask nicely for some photos?
Overall, I think this article is very successful in explaining the basic concepts of laser cooling. I'd like to make a few more minor edits when I have time, especially on the history of the subject, which is subject to a surprising amount of misinformation. Dave Kielpinski 06:08, 18 December 2005 (UTC)
I apologize for the delay responding; I'd missed the original request, then gotten extremely busy. If any of the information in the laser cooling thread in my talk page archives is useful, by all means use it. -- Christopher Thomas 03:54, 8 January 2006 (UTC)
How effective is laser cooling? does it cool fast? can it only cool to ex. 0 celcius, or can it cool to minus degrees too? Are there any real implementations? how much would such a cooling cost? how big would such a cooling device be? Imagine cooling your computer with that. ;) —The preceding unsigned comment was added by Frap ( talk • contribs) on 21:13, 20 May 2006.
The first experimental demonstration of laser cooling in solids (Yb-doped glass) took place in 1995 at Los Alamos National Labs by Epstein et al. Published in Nature, 1995. 64.106.62.179 18:25, 4 September 2007 (UTC)
There is no mention of laser cooling of solids in this article. The first instance I'm aware of this happening was published in: Phys. Rev. Lett. 78,1030 - 1033 (1997)
Since this kind of laser cooling uses an entirely different mechanism (that of anti-stokes fluorescence, should it be made into a separate article?
Since laser cooling of solids is also called "laser cooling", what should we call the page that talks about cooling of solids? Ebudiu 02:28, 29 May 2007 (UTC)
The article says that laser cooling was first demonstrated by Letokhov, Minogin and Pavlik. What is ment by "demonstrated" here? The first experiments that utilized these ideas are experiments performed by Wineland, Drullinger and Walls in 1978 who cooled Mg ions and the same year Neuhauser, Hohenstatt, Toschek and Dehmelt cooled Ba ions. I would think the original poster is talking about this article by Letokov et al but that is a theoretical thesis and doesn't contain any experimental data. The other two papers are here and here. -- ojs ( talk) 13:44, 20 November 2007 (UTC)
Any incident energy on an atom, does not cool an atom, it increments that atoms internal kinetic energy. What happens is that after succesive interactions, the atom reaches a higher internal kinetic state (or lower), where all energy interactions are resolved internally, without any external motion. This is possible, if for example the atom emits two photons in equal and opposite directions at the same time.
Just because an object is motionless within a reference framework does not imply that it is cooler in the sense of colder. Defacto, it is cooler in the sense of, more stable, more controlled, less random in it´s emision and absorbtion, but the atom is defacto, hotter, not colder.
In terms of core-shell beta emission/absortion ratio´s, that also implies that the internal beta emission/absortion would be more stable, and that could imply addicional core stability (or the exact opposite, close to the edge of blowing it´s top). Would that matter? Not if the alpha or neutron emitted cannot leave the core-shell enclosure, and therefore the atom itself, can be said to be in a state of continuous fusion/fission reactions, completely resolved within it´s own space confinement.
(See: single atom plasma fusion/fission processes)
Kabloom: What happened? Sorry sir, apparently that what we thought was pure matter X, had matter Y impurities associated and it blew. — Preceding unsigned comment added by 201.248.124.113 ( talk) 12:05, 2 March 2013 (UTC)
In recent edits Mfpars removed some information, including some equations that purported to explain how laser cooling worked. Mfpars, can you say something more about why you think the article is better without this content?
Thanks for being bold and making changes. Blue Rasberry (talk) 16:22, 9 June 2015 (UTC)
My best guess is that they're doppler cooling the Brownian motion of the chrystal, and waiting for the heat to conduct in from the surrounding liquid, but the publicity blurb is detail-free and doesn't say so. ArthurDent006.5 ( talk) 08:22, 23 November 2015 (UTC)
I'm considering adding an animation to show the reduction of phase space as a function of time. Any thoughts or feedback is welcome before I undertake this. Darth luigi ( talk) 00:35, 13 September 2023 (UTC)