optical parametric amplification (OPA)
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https://doi.org/10.1351/goldbook.OT07437
Process of signal amplification by a parametric process and a pump wave.
Source:
PAC, 2007,
79
, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 378 (https://doi.org/10.1351/pac200779030293)