Talk:Laser cooling

message: 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)
thread_title:  Definition of thermodynamic temperature 

message: We currently have this:
:Because the light is detuned to the "red" (i.e. at lower frequency) of the transition, the atoms will absorb more photons if they move towards the light source, due to the Doppler effect. Thus if one applies light from two opposite directions, the atoms will always scatter more photons from the laser beam pointing opposite to their direction of motion.
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)
thread_title:  Mechanism needs clarification 

message: 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)
thread_title: Old request for information

message: 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)
replies: text: I agree that anti-stokes cooling deserves an article (I was looking for a Wiki link for that) - whether it should be part of the atomic version of "laser cooling" or put on a separate page with a disambiguation is unclear. Probably depends on how much gets written. Tarchon 01:12, 26 April 2007 (UTC)

text: I think "optical cooling" would be the higher level topic which would subsume the various laser cooling techniques and other non-laser optical cooling approaches. I would also leave out "of solids" as being unnecessarily restrictive. The basic process of using thermal-photonic interactions to cool doesn't have any inherent restriction to solids to my knowledge.Tarchon 00:30, 26 October 2007 (UTC)

text: The name "Laser cooling" includes all methods where you use a laser cools to cool a system; the process which we're talking about here (where you use a red detuned single frequency cooling laser) is called "Doppler Cooling".  Rickky678 (talk) 15:22, 14 September 2009 (UTC)
thread_title:  No mention of laser cooling of solids 

message: 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)
replies: text: First, the Letokhov paper "Cooling and trapping of atoms and molecules by a resonant laser field" of 1976 is here . It was earlier than Wineland and Dehmelt papers. (As far as I remember, Wineland visited the seminar which Letokhov gave in USA and then stated his work). Second, Wineland/Dehmelt 1975 theoretical communication on laser cooling is not accessible and has a title which has nothing to do with laser cooling. Third, even Phillips (who got Nobel price for laser cooling - which was probably a mistake by Nobel price committee which they almost accepted later) stated that trapping of atoms were suggested by Letokhov in 1968 - see his Nobel lecture. Hence, I suggest to restore some justice and indicate that Letokhov did make a large contribution to development of laser trapping and cooling of atoms and ions.  — Preceding unsigned comment added by Iskander32 (talk • contribs) 13:18, 20 February 2019 (UTC)
replies: text: I added references to the proposal by Hansch and Schawlow, this seems to supersede the work by Letokhov, and the bulletin post by Wineland and Dehmelt.  Though the title of the Wineland and Dehmelt work does not reference laser cooling, the note describes laser cooling.  Bill Phillips references Letokhov work from 1968 in his Nobel lecture, but the work was concerned with dipole trapping and apparently did not include laser cooling. I'll try and include this reference on the "Optical Tweezer" page, which redirects from dipole trap. Darth luigi (talk) 02:10, 9 November 2023 (UTC)
thread_title:  Historical factual errors 

message: 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)
thread_title:  Is this really cooling? 

message: In recent edits  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)
thread_title:  Removal of content 

message: http://www.washington.edu/news/2015/11/16/uw-team-refrigerates-liquids-with-a-laser-for-the-first-time/
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)
thread_title:  Laser cooling of liquids by an unknown process 

message: 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)
thread_title:  Figures/movies