G. Stegeman, C. Seaton
Dec 7, 1987
Journal name not available for this finding
Abstract : We have made progress in a variety of areas within this program since our original report of DFWM in a thin film waveguide. That original experiment utilized liquid carbon disulphide (CS2) as the nonlinear mixing medium in the form of a cladding on a planar sputtered 7059 glass waveguide. A number of obvious deficiencies exist in configuration: (a) the physical form of the nonlinear medium (ie a liquid is not very practical), (b) the optical field strength in the nonlinear medium is small since only the evanescent tails of the guided modes exist in the nonlinear cladding, and (c) the magnitude of the nonlinear index in CS2 n2approx, 10 to the minus 18th power per sq m per w is not particularly high. To improve upon these deficiencies what is required is a nonlinear material preferable in a practical solid form which can be formed into low loss optical waveguides. Semiconductor doped glasses were identified as an excellent candidate material to meet these requirements. This is a glass host containing mixtures of CdS and CdSe compounds semiconductor crystallites.