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Optical parametric amplifier: Noncollinear OPA (NOPA), Optical parametric generation (OPG) & Optical parametric amplification (OPA)
An optical parametric amplifier, abbreviated OPA, is a laser light source that emits light of variable wavelengths by an optical parametric amplification process. It is essentially the same as an optical parametric oscillator, but without the optical cavity (i.e., the light beams pass through the apparatus just once or twice, rather than many many times).
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