Doppler cooling
E811517
Doppler cooling is a laser-based technique used to reduce the thermal motion of atoms or ions by exploiting the Doppler effect to selectively slow particles moving toward the light source.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| optical molasses | 1 |
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
atomic physics technique
ⓘ
laser cooling technique ⓘ |
| actsOn |
ions
ⓘ
neutral atoms ⓘ |
| aimsTo |
lower kinetic energy of atoms
ⓘ
lower temperature of atomic ensemble ⓘ reduce thermal motion of particles ⓘ |
| appliesTo |
alkali atoms
ⓘ
alkaline-earth atoms ⓘ trapped ions ⓘ |
| basedOn | Doppler effect NERFINISHED ⓘ |
| category |
non-contact cooling method
ⓘ
optical manipulation technique ⓘ |
| DopplerTemperatureDependsOn |
atomic transition frequency
ⓘ
natural linewidth of atomic transition ⓘ |
| DopplerTemperatureProportionalTo | natural linewidth divided by Boltzmann constant ⓘ |
| effect | net momentum transfer opposite to atomic motion ⓘ |
| enables |
Bose–Einstein condensation (as a precooling step)
NERFINISHED
ⓘ
atomic clocks ⓘ laser cooling and trapping of atoms ⓘ magneto-optical traps ⓘ precision spectroscopy ⓘ quantum information experiments with trapped ions ⓘ |
| field | atomic, molecular, and optical physics ⓘ |
| forceType | velocity-dependent radiation pressure force ⓘ |
| hasLimit | Doppler temperature ⓘ |
| historicallyDevelopedIn | 1970s ⓘ |
| limitSetBy | balance of cooling and heating rates ⓘ |
| mechanism |
absorption of red-detuned photons by atoms moving toward laser
ⓘ
spontaneous emission of photons in random directions ⓘ velocity-selective scattering of photons ⓘ |
| opposes | heating from spontaneous emission recoil ⓘ |
| relatedTo |
Sisyphus cooling
ⓘ
sideband cooling ⓘ sub-Doppler cooling ⓘ |
| requires |
closed or nearly closed cycling transition
ⓘ
near-resonant optical transition ⓘ red-detuned laser frequency ⓘ repeated photon scattering ⓘ |
| typicalLaserDetuning | a few natural linewidths below resonance GENERATED ⓘ |
| typicalLaserIntensity | on the order of saturation intensity GENERATED ⓘ |
| typicalTemperatureScale | microkelvin range ⓘ |
| usedIn |
laboratory ultra-cold atom experiments
ⓘ
precision metrology ⓘ tests of fundamental physics ⓘ |
| uses | laser light ⓘ |
| usesConfiguration |
counter-propagating laser beams
ⓘ
optical molasses ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
optical molasses