Kurtz powder test

Solid-state methods Kurtz powder test... 

SHG is determined in the solid state by the Kurtz powder test, in which the powdered sample is illuminated, typically at 1064 nm i.e. in the ir), and emission is monitored at 532 nm (in the green). The test suffers from problems of reproducibility, since it is highly dependent on sample preparation (dispersive factors) and crystal optic effects such as phase matching. 

Organic Materials. While most SHG materials are ultimately referenced to quartz,1 urea is a common powder standard used in the Kurtz-Perry testing protocol. Urea(33,34) has... 

Predictive power is poor, so confine searches to easily preparable materials. Use early screening techniques which work on powders like dielectric constant measurements, the Giebe-Scheibe circuit for piezoelectricity and the Kurtz 36,37) powder measurement test for SHG which was "invented" as a result of our pleas for help in finding materials. 

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