Thermal poling of silica in air and under vacuum: the influence of charge transport on second harmonic generation
A comparison between thermal poling of silica in air and in vacuum is reported. It is shown that the second-order susceptibility and thickness of the nonlinear layer as well as their time evolution are highly dependent on the surrounding poling atmosphere. In the vacuum case a charge distribution (u...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
1999-04.
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| Subjects: | |
| Online Access: | Get fulltext |
| Summary: | A comparison between thermal poling of silica in air and in vacuum is reported. It is shown that the second-order susceptibility and thickness of the nonlinear layer as well as their time evolution are highly dependent on the surrounding poling atmosphere. In the vacuum case a charge distribution (under the anode) more complex and broader than that for the air case has also been revealed by laser induced pressure pulse measurements. A multiple charge carrier model can explain the formation and evolution of the depletion region under the anode. The findings are relevant to achieve improved nonlinearities in fibre and waveguide devices. |
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