Relative measurement of the optical nonlinearities of KDP, ADP, LiNbO3, and α-HIO3

Accurate relative measurements have been carried out of the nonlinear optical coefficients of KDP, ADP, LiNbO
3
and α-iodic acid (HIO
3
). Also, a new absolute value for the standard optical nonlinear coefficient d
36
of KDP can be inferred.