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  "For the SPDC process to be efficient, both energy and momentum must be conserved. In an ideal scenario without chromatic dispersion, phase matching would work trivially, since the frequency and wavevector are simply related by a factor of the speed of light. However, real optical materials exhibit chromatic dispersion..." Check out my new blog post "Quasi phase matching with periodic poling", that I wrote for Raicol Crystals . https://raicol.com/quasi-phase-matching-with-periodic-poling Let me know what you think, and if there are similar topics you would like me to write about :)