# this file is part of refractiveindex.info database # refractiveindex.info database is in the public domain # copyright and related rights waived via CC0 1.0 REFERENCES: | M. J. Rosker, K. Cheng, C. L. Tang. Practical urea optical parametric oscillator for tunable generation throughout the visible and near-infrared. IEEE J. Quantum Electron. 21 1600-1606 (1985) COMMENTS: | Room temperature. Extraordinary ray (e). CONDITIONS: direction: e DATA: - type: formula 9 wavelength_range: 0.3 1.06 coefficients: 2.51527 0.0240 0.0300 0.020 1.52 0.8771