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Several recent studies have shown that organic materials can be promising for nonlinear optics due to their large nonlinearities as well as resistance to optical damage. From our investigation of a number of new compounds, three materials with a nonlinearity larger than urea by an order of magnitude, are shown in Fig. 1. These compounds, 1-(2,4-dimitrophenyl)-semicarbazide, 3-dimethylamino-4′-nitroacrylophenone, and di-(p-nitrophenyl)urea, also, showed no sign of damage at power densities up to 0.25 GW/cm2 from a Q-switched Nd:YAG laser. In comparison, a powder sample of LiNbO3 was readily damaged at an intensity of 10 MW/cm2.
© 1981 Optical Society of America
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