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Reference.org
Magic wavelength
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<p>The magic wavelength (also known as a related quantity, magic frequency) is the wavelength of an <a href="/facts/Optical_lattice/Inu8klUj">optical lattice</a> where the <a href="/facts/Polarizability/0XRkXwUu">polarizabilities</a> of two <a href="/facts/Atomic_clock/MF8nsXDR">atomic clock states</a> have the same value, such that the <a href="/facts/Stark_effect/NRLArv1u">AC Stark shift</a> caused by the <a href="/facts/Intensity_(physics)/KFWkJkJI">laser intensity</a> fluctuation has no effect on the <a href="/facts/Hyperfine_structure/aqj0dMut">transition frequency</a> between the two clock states. </p>