Ellipsometric investigation of the mechanism of hologram storage in lithium niobate
A computer-controlled ellipsometer was used to obtain data on the birefringence changes induced in lithium niobate crystals by irradiation with an argon-ion laser. The instrument was set to take readings on a rectangular grid of points before and after irradiation. Irradiation was performed with ci...
Main Author: | |
---|---|
Language: | English |
Published: |
University of British Columbia
2011
|
Subjects: | |
Online Access: | http://hdl.handle.net/2429/32639 |
id |
ndltd-UBC-oai-circle.library.ubc.ca-2429-32639 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-UBC-oai-circle.library.ubc.ca-2429-326392018-01-05T17:46:47Z Ellipsometric investigation of the mechanism of hologram storage in lithium niobate Wong, William K. Y. Lithium niobate Holography A computer-controlled ellipsometer was used to obtain data on the birefringence changes induced in lithium niobate crystals by irradiation with an argon-ion laser. The instrument was set to take readings on a rectangular grid of points before and after irradiation. Irradiation was performed with circular and with narrow rectangular light beams. Results are compared with the prediction of the model of Chen in which he postulated the presence of an internal field Eo in the direction of the c-axis of the crystal. According to his theory, electrons, photoexcited from traps by the laser light, drift under the influence of Eo along the c-axis before being retrapped. The resulting space-charge field set between positive ionised centres and trapped electrons gives rise to the observed birefringence changes via the linear electro-optic effect of the crystal. Approximate mathematical models based on Chen's theory are used to solve the problem with narrow rectangular light beams. Results are compared with experiments. Applied Science, Faculty of Electrical and Computer Engineering, Department of Graduate 2011-03-21T18:27:20Z 2011-03-21T18:27:20Z 1973 Text Thesis/Dissertation http://hdl.handle.net/2429/32639 eng For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. University of British Columbia |
collection |
NDLTD |
language |
English |
sources |
NDLTD |
topic |
Lithium niobate Holography |
spellingShingle |
Lithium niobate Holography Wong, William K. Y. Ellipsometric investigation of the mechanism of hologram storage in lithium niobate |
description |
A computer-controlled ellipsometer was used to obtain data on the birefringence changes induced in lithium niobate crystals by irradiation with an argon-ion laser. The instrument was set to take readings on a rectangular grid of points before and after irradiation. Irradiation was performed with circular and with narrow rectangular light beams. Results are compared with the prediction of the model of Chen in which he postulated the presence of an internal field Eo in the direction of the c-axis of the crystal. According to his theory, electrons, photoexcited from traps by the laser light, drift under the influence of Eo along the c-axis before being retrapped. The resulting space-charge field set between positive ionised centres and trapped electrons gives rise to the observed birefringence changes via the linear electro-optic effect of the crystal. Approximate mathematical models based on Chen's theory are used to solve the problem with narrow rectangular light beams. Results are compared with experiments. === Applied Science, Faculty of === Electrical and Computer Engineering, Department of === Graduate |
author |
Wong, William K. Y. |
author_facet |
Wong, William K. Y. |
author_sort |
Wong, William K. Y. |
title |
Ellipsometric investigation of the mechanism of hologram storage in lithium niobate |
title_short |
Ellipsometric investigation of the mechanism of hologram storage in lithium niobate |
title_full |
Ellipsometric investigation of the mechanism of hologram storage in lithium niobate |
title_fullStr |
Ellipsometric investigation of the mechanism of hologram storage in lithium niobate |
title_full_unstemmed |
Ellipsometric investigation of the mechanism of hologram storage in lithium niobate |
title_sort |
ellipsometric investigation of the mechanism of hologram storage in lithium niobate |
publisher |
University of British Columbia |
publishDate |
2011 |
url |
http://hdl.handle.net/2429/32639 |
work_keys_str_mv |
AT wongwilliamky ellipsometricinvestigationofthemechanismofhologramstorageinlithiumniobate |
_version_ |
1718594811729018880 |