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The second harmonic generation (SHG) is a nonlinear optical process occurring only in noncentrosymmetric space groups. The measurement of the SHG signal generated by powdered samples [1] is an extremely sensitive tool for the detection of noncentrosymmetric phases at the ppm level [2] and was already used successfully to detect the noncentrosymmetry of crystal arrangements such as conglomerates [3]. Recently, we developed a set-up for temperature resolved SHG (TRSHG) in order to monitor solid-solid transitions. In this communication, new possibilities of this technique for the characterization of organic compounds in the solid state are presented. In particular, the desolvation of lactose and the solid-solid phase transition of organic compounds (involving metastable equilibrium) are discussed.

Temperature-resolved second harmonic generation: a tool designed to study solid-solid transition