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Second harmonic generation in thermally-poled inorganic glasses

Second harmonic generation in thermally-poled inorganic glasses
Second harmonic generation in thermally-poled inorganic glasses
Inorganic glasses with inversion symmetry naturally have not been possessing the second order nonlinearities (SONs). However, permanent SONs with 1 pm/V (~0.2 of the value χ22(2) in LiNbO3 have been observed in commercial fused-quartz glasses. For a typical poling condition, samples with 1 mm thick are heated to 280°C with an applied voltage of 4 kV for 15 min and then cooling till room temperature with the field applied. After this poling procedure, the SON is observed only near the anodic surface. This result leads to the interest of the possibility of parametric frequency converters and linear electrooptic modulators monolithically integrated into optical fibers or planar glass waveguides. A better understanding of the mechanism, which is not fully understood, may help improve the value of SON in poled glasses and discover novel SON inorganic glass materials. We have systematically studied the effects of poling conditions, especially poling dc voltage and time on SHG in thermally-poled fused quartz and discovered that the SH signal is proportional to the square of the applied voltage and that the speed of the poling process increases with the applied voltage. Effects of impurity concentrations such as oxygen deficient centre (ODC), Na, and OH in fused quartz glasses were also studied. A correlation of the SH signal with the ODC concentration, which was controlled by annealing temperatures (900 - 1100°C) in air, was observed. The mechanisms and materials conditions to create permanent SONs in various oxide glasses, e.g., fused quartz, sol-gel derived silica, tellurite glasses, are discussed in the light of these new results.
Takebe, H.
7dbc1b40-b524-47b8-a478-2808dd167844
Kazansky, P.G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a
Morinaga, K.
35e9eb13-61bf-4161-ba9b-ad7634e9341c
Takebe, H.
7dbc1b40-b524-47b8-a478-2808dd167844
Kazansky, P.G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a
Morinaga, K.
35e9eb13-61bf-4161-ba9b-ad7634e9341c

Takebe, H., Kazansky, P.G., Russell, P.St.J. and Morinaga, K. (1996) Second harmonic generation in thermally-poled inorganic glasses. Third International Conference on Nonlinear Optics, Marco Island, United States.

Record type: Conference or Workshop Item (Paper)

Abstract

Inorganic glasses with inversion symmetry naturally have not been possessing the second order nonlinearities (SONs). However, permanent SONs with 1 pm/V (~0.2 of the value χ22(2) in LiNbO3 have been observed in commercial fused-quartz glasses. For a typical poling condition, samples with 1 mm thick are heated to 280°C with an applied voltage of 4 kV for 15 min and then cooling till room temperature with the field applied. After this poling procedure, the SON is observed only near the anodic surface. This result leads to the interest of the possibility of parametric frequency converters and linear electrooptic modulators monolithically integrated into optical fibers or planar glass waveguides. A better understanding of the mechanism, which is not fully understood, may help improve the value of SON in poled glasses and discover novel SON inorganic glass materials. We have systematically studied the effects of poling conditions, especially poling dc voltage and time on SHG in thermally-poled fused quartz and discovered that the SH signal is proportional to the square of the applied voltage and that the speed of the poling process increases with the applied voltage. Effects of impurity concentrations such as oxygen deficient centre (ODC), Na, and OH in fused quartz glasses were also studied. A correlation of the SH signal with the ODC concentration, which was controlled by annealing temperatures (900 - 1100°C) in air, was observed. The mechanisms and materials conditions to create permanent SONs in various oxide glasses, e.g., fused quartz, sol-gel derived silica, tellurite glasses, are discussed in the light of these new results.

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More information

Published date: December 1996
Venue - Dates: Third International Conference on Nonlinear Optics, Marco Island, United States, 1996-12-01

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Local EPrints ID: 76865
URI: http://eprints.soton.ac.uk/id/eprint/76865
PURE UUID: 642a74ea-2a80-4c5c-a53e-78809a9fe4dd

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Date deposited: 11 Mar 2010
Last modified: 06 Feb 2023 17:58

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Contributors

Author: H. Takebe
Author: P.G. Kazansky
Author: P.St.J. Russell
Author: K. Morinaga

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