Linear and nonlinear optical properties of the organic nonlinear material 4-nitro-4'-methylbenzylidene aniline (NMBA)

Grant Bourhill; Frank R. Cruickshank; David John Pugh; Graham S. Simpson; John N. Sherwood; Raymond T. Bailey

doi:10.1117/12.139197

25 February 1993 Linear and nonlinear optical properties of the organic nonlinear material 4-nitro-4'-methylbenzylidene aniline (NMBA)

Grant Bourhill, Frank R. Cruickshank, David John Pugh, Graham S. Simpson, John N. Sherwood, Raymond T. Bailey

Author Affiliations +

Proceedings Volume 1775, Nonlinear Optical Properties of Organic Materials V; (1993) https://doi.org/10.1117/12.139197
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

The organic crystal 4-nitro-4'-methylbenzylidene aniline was identified as a promising nonlinear material by the powder technique. The material gave a second harmonic intensity 16 times that of urea. Large single crystals of dimensions 5 X 3 X 1 cm³ were grown by temperature lowering a supersaturated ethyl acetate solution. An orthoscopic examination revealed the positions of the principal dielectric axes. The refractive index dispersions were determined to an accuracy of +/- 0.0015 using the minimum deviation technique and Maker fringe spacings. These dispersion curves were fitted with a Sellmeier equation which allowed the indices to be determined to +/- 0.0006. The nonlinear d- coefficients d₁₁, d₃₃, d₃₁ and d₁₃ were evaluated at 1000, 1064 and 1300 nm using the Maker fringe technique. The coefficient d₁₁ was over 200 times larger than KDP d₃₆. In addition, the non-diagonal coefficient d₃₁ was comparable to the phase- matching coefficient in the organic material DAN. Critically phase-matched second harmonic signals were observed at all fundamental wavelengths. There was excellent agreement between the experimentally determined and theoretical phase-matched incidence angles. This agreement is presented. Noncritical phase-matched conditions have been calculated and are reported. Both angle and wavelength noncritical phase-matching is possible with this crystal.

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Grant Bourhill, Frank R. Cruickshank, David John Pugh, Graham S. Simpson, John N. Sherwood, and Raymond T. Bailey "Linear and nonlinear optical properties of the organic nonlinear material 4-nitro-4'-methylbenzylidene aniline (NMBA)", Proc. SPIE 1775, Nonlinear Optical Properties of Organic Materials V, (25 February 1993); https://doi.org/10.1117/12.139197

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