OPA/SFG wavelength converter

Wavelengths \( \lambda_1 \), \( \lambda_2 \) and \( \lambda_3 \), satisfying $$ \frac{1}{\lambda_1} + \frac{1}{ \lambda_2 } = \frac{1}{\lambda_3} . $$

\( \lambda_1 \) [nm]
\( \lambda_2 \) [nm]
\( \lambda_3 \) [nm]
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