Previous in Forum: Caterpiller Generator Model LC6   Next in Forum: Phase Shift Across Transformers
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
10 comments
Rate Comments: Nested
sam.isatis
Participant

Join Date: Jun 2016
Posts: 1

What Happens To The Photons Generated By Laser Cooling?

06/09/2016 9:49 AM

In laser cooling we understood that after absorbing photon, the atom emits another photon with higher energy than the absorbed one (by adding the phonon vibrational energy (heat or thermal energy) to the photon energy) and then it cools. Now what is going to happen to these new and high energy photons that must not stay in the system.
Register to Reply
Pathfinder Tags: laser cooling thermal energy
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Anonymous Poster #1
#1

Re: what happened to the photons generated by laser cooling?

06/09/2016 9:53 AM

https://en.wikipedia.org/wiki/Laser_cooling
Register to Reply
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#2

Re: what happened to the photons generated by laser cooling?

06/09/2016 10:20 AM

They go somewhere else. Obviously a few of these photons will interact with the atoms being cooled and return a quantum of energy. Most of these photons just leave the area.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
SolarEagle
Guru

Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#3

Re: What Happens To The Photons Generated By Laser Cooling?

06/09/2016 11:37 AM

If you get the photon too excited, it has a spontaneous emission...

__________________
 All living things seek to control their own destiny....this is the purpose of life
Register to Reply
Tom_Consulting
Guru
Popular Science - Weaponology - New Member Fans of Old Computers - PDP 11 - New Member Technical Fields - Architecture - New Member Hobbies - HAM Radio - New Member

Join Date: Oct 2009
Location: Maine, USA
Posts: 2168
Good Answers: 71
#5
In reply to #3

Re: What Happens To The Photons Generated By Laser Cooling?

06/10/2016 10:04 AM

"If you get the photon too excited, it has a spontaneous emission..."

They have drugs for that!

__________________
 Tom - "Hoping my ship will come in before the dock rots!"
Register to Reply
bullardrr
Power-User

Join Date: Mar 2014
Posts: 373
Good Answers: 2
#4

Re: What Happens To The Photons Generated By Laser Cooling?

06/10/2016 10:03 AM

It all sounds like voodoo thermo to me, much like the notion that the Universe cools down after the Big Bang. There is no thermal sink for the heat of the Universe. It does not cool. Something more than just pure photonic behavior is perking laser cooling.
Register to Reply
StandardsGuy
Guru
Popular Science - Cosmology - Let's keep knowledge expanding Engineering Fields - Retired Engineers / Mentors - Hobbies - HAM Radio - New Member

Join Date: Dec 2006
Location: North America, Earth
Posts: 4528
Good Answers: 106
#6
In reply to #4

Re: What Happens To The Photons Generated By Laser Cooling?

06/10/2016 11:43 AM

"There is no thermal sink for the heat of the Universe. It does not cool. "

The universe cools because it is expanding.

__________________
 “I would rather have questions that can't be answered than answers that can't be questioned.” - Richard Feynman
Register to Reply
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#7
In reply to #6

Re: What Happens To The Photons Generated By Laser Cooling?

06/10/2016 11:51 AM

I guess this means the universe really is infinite. It's always bigger!

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply
bullardrr
Power-User

Join Date: Mar 2014
Posts: 373
Good Answers: 2
#8
In reply to #6

Re: What Happens To The Photons Generated By Laser Cooling?

06/10/2016 1:19 PM

''The universe cools because it is expanding.''

Expanding to where? Where it is colder than where the Universe presently is? In which case it is warming up where it is expanding to? As I said, ''voodoo thermo''.
Register to Reply
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#9
In reply to #8

Re: What Happens To The Photons Generated By Laser Cooling?

06/10/2016 2:33 PM

The point most people don't grasp is that the Big Bang is still happening. Space is not expanding into something other than space. More space itself is being created.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply
James Stewart
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14331
Good Answers: 162
#10

Re: What Happens To The Photons Generated By Laser Cooling?

06/10/2016 4:55 PM

The photons emitted leave the cavity the atoms being cooled are in.

I also saw where they have made a Bose-Einstein condensate composed of nothing but photons - a super mega photon, if you will. This has to do with light interacting with a dye inside a spherical mirror pair cavity. It is believed this will be most useful in the study of time.

__________________
 If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Register to Reply
Have a Different Question?
10 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); bullardrr (2); James Stewart (1); redfred (3); SolarEagle (1); StandardsGuy (1); Tom_Consulting (1)

Previous in Forum: Caterpiller Generator Model LC6   Next in Forum: Phase Shift Across Transformers

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (78 right now)
Show Members
Advertisement