Magic wavelength
The magic wavelength (also known as a related quantity, magic frequency) is the wavelength of an optical lattice where the polarizabilities of two atomic clock states have the same value, such that the AC Stark shift caused by the laser intensity fluctuation has no effect on the transition frequency between the two clock states. == AC Stark shift by optical lattice == The laser field in an optical lattice induces an electric dipole moment in the atoms to exert forces on them and hence confine them.