| http://www.w3.org/ns/prov#value | - Ferroelectrics have generally lower refractive indices than GaAs, but if the buffer layer is formed of a material such as MgO that has a lower refractive index than the ferroelectrics, the laser light can be confined within the thin ferroelectric layer, and the requisite thickness of the ferroelectrics is determined by the difference in refractive index.
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