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Phase mismatching is an important aspect of second harmonic generation (SHG) in nonlinear optics. The second harmonic wave

is generated at one place and its original phase is 0. Another harmonic wave

is generated at another place and its original phase is

. When

is largest. When

, the sum is 0. Therefore, the length

is defined as the optimum length in SHG.

Contributed by: R. B. Jin

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Phase Mismatch in SHG in Nonlinear Optics