Thanks, the papers you quoted seem to describe something with low losses (though i can't find explicit statements to that effect when skimming). I was under the

Thanks, the papers you quoted seem to describe something with low losses (though i can't find explicit statements to that effect when skimming). I was under the impression that nonlinear optics will have huge losses, because it requires multiphoton interactions (which should usually have low cross sections), so will have to figure out which part of my intuition doesn't hold.