Measurement and prediction of phase-matching conditions in the nonlinear optical crystal N-(4-nitrophenyl)-L-prolinol

We report an accurate set of Sellmeier coefficients for the N-(4-nitrophenyl)-L-prolinol (NPP) crystal, obtained by improving a previously proposed set through the measurement of the phase-matching angle for second harmonic generation. Our Sellmeier set describes well the phase-matching conditions for various nonlinear optical interactions, covering almost completely the transmission range of the crystal.