What are the condition for coherence length equal the full length of the material in second harmonics generation?

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Yariv Shamir

Yes indeed, this length is defined that way in textbooks. This means that beyond that length, if the beam still traverses the material, photons will split back into two fundamental longer wavelength... and then vice versa...

Raad Shaker Alnayli

What about. If

n(w) _ n(w2) = 0 ??

Professor Vincent Lecoeuche,

for your perfect answers, I agree and thankful

Great regards

Raad