An optical parametric amplifier, abbreviated OPA, is a laser light source that emits light of variable wavelengths by an optical parametric amplification process.
Read more about Optical Parametric Amplifier: Optical Parametric Generation (OPG), Optical Parametric Amplification (OPA), Noncollinear OPA, Multipass OPA, Relationship To Parametric Amplifiers in Electronics
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“People who have realized that this is a dream imagine that it is easy to wake up, and are angry with those who continue sleeping, not considering that the whole world that environs them does not permit them to wake. Life proceeds as a series of optical illusions, artificial needs and imaginary sensations.”
—Alexander Herzen (1812–1870)
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