Optically encoded second-harmonic generation in germanosilicate glass by a femtosecond laser
- 1 July 1999
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 24 (13) , 911-913
- https://doi.org/10.1364/ol.24.000911
Abstract
Second-harmonic generation in germanosilicate glasses was encoded by coherent superposition of the 810-nm fundamental and the 405-nm second-harmonic light of a femtosecond laser. The difference spectra between the absorption spectra of the glasses before and after preparation were measured. An evident correlation between the induced second-order nonlinearity and the creation of a Ge electron center was observed, suggesting that a band-to-band transition by multiphoton absorption is probably responsible for the photoinduced second-harmonic generation.Keywords
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