ABSTRACT
Immediately following the experiment reported in [9] , a great many other nonlinear effects were discovered in numerous experiments , including the subsequent experi ments by Professor Franken and co-workers on optical mixing [ 1 2] and optical rectification [ 1 3 ] . In 1 962, Peter Franken published the first detailed review of the early work on nonlinear effects [ 14] and shortly after, the theory of nonlinear optical effects [ 1 5-17] was developed and the classic book on nonlinear optics [ 1 8] pub lished. Twenty years later, nonlinear optics became the subject matter of a textbook for students [ 1 9] .
