| Autor: |
Mario Martinelli, A. Terio, M. J. Callahan, Franco D’Amore, A. Zappettini, Silvia Maria Pietralunga, David Bliss |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
physica status solidi (c). 1:997-1000 |
| ISSN: |
1610-1634 |
| DOI: |
10.1002/pssc.200304274 |
| Popis: |
In this work, the dispersion of the third order nonlinear coefficients χ3xxxx and χ3zzzz of ZnO single crystals is determined. For this purpose, the third harmonic generation (THG) technique is employed. Tunable laser source has been used for the fundamental beam, spanning the optical range between 1.05 and 1.5 microns so that the generated third harmonic signal is made to cover a range (from 500 nm up to 350 nm) which encompasses both the transparency and the one photon absorption region above the fundamental bandgap. The determined data in the transparency region (with the THG signal at 500 nm) are 2.2x10−12 esu for both coefficients. These values are about significantly larger than previously reported ones. In the high absorption range the exciton contribution to the dispersion of the nonlinear coefficients is evidenced. For the first time the dispersion of χ3xxxx and χ3zzzz is studied in ZnO single crystals. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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