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We report the observation of multiple diffraction rings patterns in paprika and pepper oils using continuous wave laser beams .The patterns occur at relatively low intensities . The number of rings together with outermost ring diameter of each pattern increases monotonically with increasing input power . The total changes in refractive index , ∆n ,and nonlinear refractive index,n2 ,are determined using the number of rings observed in both samples and 473 nm and 532 nm laser beams . We obtained good values of ∆n = 0.01 and n2 = 10-6 cm2/w . These large values are  attributed  to  thermal effects .

Determination of nonlinear refractive index of paprika oil and pepper oil under cw visible laser illumination