Abstract
Semiconductor microcrystallite-doped glasses (SDG), which do not have a macroscopic χ(2) because of the random orientation of microcrystallites within the glass host, can be optically encoded to exhibit- phase matched second-harmonic generation (SHG)1 in a manner similar to the seeded preparation of homogeneous glass.2,3 The simultaneous exposure of the SDG to radiation at the fundamental and second harmonic is believed to leave behind a dc electric field with the proper spatial periodicity to phase-match a χ(3) (2ω; ω, ω, 0) process. The SDG are believed to be encoded in a three-step process involving directional trapping of free carriers generated by absorption of the second harmonic and directed by Edc= χ(3) (0;2ω,−ω,−ω),E2 (ω)E(2ω).1 When the encoding fields are removed, a dc electric field is left behind and the SHG is a direct measure of the strength of the dc field and an indirect measure of χ(3)(0; 2ω, −ω, −ω).
© 1993 Optical Society of America
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