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A new organic electrooptic crystal: 2,6-dibromo-N-methyl-4-nitroaniline (DBNMNA)

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3 Author(s)
Nahata, A. ; Allied Signal Inc., Morristown, NJ, USA ; Horn, K.A. ; Yardley, J.T.

A new organic electrooptic crystal, 2,6-dibromo-N-methyl-4-nitroaniline, is reported. The crystal structure was determined by X-ray diffraction (orthorhombic, space group Fdd2, point group mm2, Z=16, a=11.745 Å, b=29.640 Å, c=10.807 Å). The refractive indexes were measured at several wavelengths between 500 and 1100 nm (at 632.8 nm, na=1.90, nb=1.62, and nc=1.48) and fit the data to a single oscillator Sellmeier equation. A report is presented on measurements of the linear electrooptic effect, yielding the combined coefficients na 3r13-nc3 r33, as well as the first known measurements of the quadratic electrooptic effect in an organic crystal, yielding the coefficients r42 and r51 at 514.5, 632.8, and 810 nm. Good agreement is found between the observed dispersion in the electrooptic coefficients and that predicted by the simple two-level dispersion model

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Quantum Electronics, IEEE Journal of  (Volume:26 ,  Issue: 9 )