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Proceedings Paper

Linear and nonlinear optical properties of the organic nonlinear material 4-nitro-4'-methylbenzylidene aniline (NMBA)
Author(s): Grant Bourhill; Frank R. Cruickshank; David John Pugh; Graham S. Simpson; John N. Sherwood; Raymond T. Bailey
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Paper 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.

Paper Details

Date Published: 25 February 1993
PDF: 12 pages
Proc. SPIE 1775, Nonlinear Optical Properties of Organic Materials V, (25 February 1993); doi: 10.1117/12.139197
Show Author Affiliations
Grant Bourhill, Univ. of Strathclyde (United Kingdom)
Frank R. Cruickshank, Univ. of Strathclyde (United Kingdom)
David John Pugh, Univ. of Strathclyde (United Kingdom)
Graham S. Simpson, Univ. of Strathclyde (United Kingdom)
John N. Sherwood, Univ. of Strathclyde (United Kingdom)
Raymond T. Bailey, Univ. of Strathclyde (United Kingdom)

Published in SPIE Proceedings Vol. 1775:
Nonlinear Optical Properties of Organic Materials V
David J. Williams, Editor(s)

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