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  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1990),
  • paper CMB4

Asymmetrical biphenyls for quadratic nonlinear optics

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Abstract

The search for organic crystalline materials transparent in the blue or UV range and combining high molecular hyperpolarizabilities β with high crystalline susceptibilities χ(2) is driven by very promising applications in the field of frequency doubling of laser diodes at 0.85 μm. The challenge is to find a trade-off between physicochemical parameters underlying, respectively, transparency and nonlinearity. For that purpose, we have investigated the linear and quadratic nonlinear optical properties of 1 ⩽ n ⩽ 4.1 The electronic and structural parameters of interest are the varying extension of the conjugated system, the intermediary torsional angles (as opposed to the planeity of stilbene and polyenes), and the relatively moderate donor-acceptor strength of the substituents.

© 1990 Optical Society of America

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