The photorefractive effect is a nonlinear optical effect seen in certain crystals and other materials that respond to light by altering their refractive index . The effect can be used to store temporary, erasable holograms and is useful for holographic data storage . It can also be used to create a phase-conjugate mirror or an optical spatial soliton.
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“The machine has had a pernicious effect upon virtue, pity, and love, and young men used to machines which induce inertia, and fear, are near impotents.”
—Edward Dahlberg (1900–1977)