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- Coherence_time abstract "For an electromagnetic wave, the coherence time is the time over which a propagating wave (especially a laser or maser beam) may be considered coherent. In other words, it is the time interval within which its phase is, on average, predictable.In long-distance transmission systems, the coherence time may be reduced by propagation factors such as dispersion, scattering, and diffraction.Coherence time, τ, is calculated by dividing the coherence length by the phase velocity of light in a medium; approximately given bywhere λ is the central wavelength of the source, Δν and Δλ is the spectral width of the source in units of frequency and wavelength respectively, and c is the speed of light in vacuum.A single mode fiber laser has a linewidth of a few kHz. The Schawlow-Townes limit for some cw lasers can be below 1 Hz. Hydrogen masers have linewidth around 1 Hz; their coherence length approximately corresponds to the distance from the Earth to the Moon.As of 2009, single electron spins show the longest room-temperature spin dephasing times ever observed in solid-state systems (1.8 ms).".
- Coherence_time wikiPageID "40894".
- Coherence_time wikiPageRevisionID "574617087".
- Coherence_time hasPhotoCollection Coherence_time.
- Coherence_time subject Category:Electromagnetic_radiation.
- Coherence_time subject Category:Optics.
- Coherence_time subject Category:Radio_frequency_propagation.
- Coherence_time type BodyPart105220461.
- Coherence_time type Eye105311054.
- Coherence_time type Optics.
- Coherence_time type Organ105297523.
- Coherence_time type Part109385911.
- Coherence_time type PhysicalEntity100001930.
- Coherence_time type SenseOrgan105299178.
- Coherence_time type Thing100002452.
- Coherence_time comment "For an electromagnetic wave, the coherence time is the time over which a propagating wave (especially a laser or maser beam) may be considered coherent.".
- Coherence_time label "Coherence time".
- Coherence_time label "زمن الاتساق".
- Coherence_time sameAs 가간섭성_시간.
- Coherence_time sameAs m.0b681.
- Coherence_time sameAs Q4118612.
- Coherence_time sameAs Q4118612.
- Coherence_time sameAs Coherence_time.
- Coherence_time wasDerivedFrom Coherence_time?oldid=574617087.
- Coherence_time isPrimaryTopicOf Coherence_time.