Glasses with High Nonlinear Refractive IndicesHiroyuki Nasu, James S. Lin, John Lau and J. D. MackenzieDepartment of Materials Science and Engineering, University of California, Los Angeles,California 90024AbstractIn the past, a great deal of theoretical and experimental efforts have been devoted tothe development of glasses with low nonlinear refractive index mainly because of laserrequirements. Recently, however, interests in rapid self- induced refractive index changesin materials have focussed the importance of high nonlinear refractive indices. This reportis concerned with the theoretical and experimental development in the preparation of glasseswith very high nonlinear refractive index.In glasses, the average observed value of nonlinear refractive index, n2, is about 0.Olx10 Ilesu. Changes in nz are dependent on the third order electronic polarization which inturn is governed by (a) the linear electronic polarization (b) the absorption frequency and(c) the product of the density of polarizable atoms or molecules and oscillator strength.With these consideration, theoretical calculation of n2 have been made for glass samples,and discussed with their IR and visible spectra.IntroductionRecent development of high power laser requires special materials for optical system.The refractive index (n) can be expressed asn = no + n2