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Reference.org
Optical parametric amplifier
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<p>An optical parametric amplifier, abbreviated OPA, is a <a href="/facts/Laser/jk6PTvvT">laser</a> light source that emits light of variable <a href="/facts/Wavelength/kcJU0ymz">wavelengths</a> by an optical <a href="/facts/Parametric_amplifier/QtbKjv6b">parametric amplification</a> process. It is essentially the same as an <a href="/facts/Optical_parametric_oscillator/K6RBDNjY">optical parametric oscillator</a>, but without the <a href="/facts/Optical_cavity/BITPG3ga">optical cavity</a> (i.e., the light beams pass through the apparatus just once or twice, rather than many many times). </p>