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Created page with "== Introduction == An Optical parametric amplifier (OPA) is a type of amplifier used in the field of optics to amplify an optical signal. OPAs are based on the process of parametric amplification, where the energy of a high-frequency pump wave is transferred to a lower-frequency signal wave and an idler wave. This process is facilitated by a nonlinear optical medium. == Principles of Operation == T..."