Laser Cooling - Sixty Symbols

Learn how lasers can be used to cool atoms to temperatures approaching absolute zero. More physics at http://www.sixtysymbols.com/

Category:

Science & Technology

Tags:

• laser
• cooling

[RoGeorgeRoGeorge]

Now, what would be the first most enjoyable thing?

[Mothdust666]

Ha, lovely conclusion : )

[Aviatorsmith]

@anonymousbl00dlust The wavelengths supplied to the atoms are not used to excite the electrons. The atoms re-emits the photon which causes the atom to gain the momentum from the photon. If the momentum is against the original direction the atom is heading, it will slow it down.

[marmaladekamikaze]

@anonymousbl00dlust

The photon energy is actually lower than is necessary to excite the atoms electrons, but when the atoms are moving towards the photon source the doppler effect causes the atoms electrons to essentially be fooled into being exciting. The atoms slow down 3:40. To be honest I'm not an expert either.

[anonymousbl00dlust]

wait a minute. when the electron of a given atom absorbs a photon and the atom goes to an exited state it gains energy. how can you be cooling down the gas if you continuously ADD energy to it's atoms? Are these atoms all ending up at higher and higher states as they are cooled?

[striper1149]

bad editing

[kousoulides]

Sixty symbols is the Sexiest Channel on the Web!

[JoeJoeTater]

@elflordbob1 Why would that be? I would imagine converting energy into matter would only occur at very high energies, even if it's an unknown form of matter. Though I suppose dark matter particles could be of very low mass...

[elflordbob1]

@JoeJoeTater

it gets converted to dark matter from what i understand

[JoeJoeTater]

So, where does the energy from the hot atoms go?

[QuantumChance]

thanks youtube for always sucking on the educational video upload speed. ugh

[nedladdy]

@RoGeorgeRoGeorge Perhaps writing it all up by any chance?

cheers