Optical cleaning of lithium niobate crystals
Optical cleaning of lithium niobate crystals
View/Type of Scholarly Publication
DissertationDate of Exam
29.01.2010Date of Publication
04.03.2010Advisor
Buse, KarstenCo-Referee
Maier, KarlMetadata
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Abstract
An all-optical method for the removal of photoexcitable electrons from photorefractive centers to get rid of optical damage in lithium niobate crystals is presented, the so-called "optical cleaning". The method combines the photovoltaic drift of electrons with ionic charge compensation at sufficiently high temperatures of about 180 °C. Optimum choice of the light pattern plus heat dramatically decreases the concentration of photoexcitable electrons in the exposed region leading to a suppression of optical damage. Experiments with slightly iron-doped lithium niobate crystals have shown an increase of the threshold for optical damage of more than 1000 compared to those of untreated crystals.
Subjects
Lithiumniobat, Photorefraktion, optischer Schaden, nichtlinear-optischer Kristall, ferroelektrischer Kristall, lithium niobate, photorefraction, optical damage, nonlinear-optical crystal, ferroelectric crystal
Classification (DDC)
530 PhysikKösters, Michael: Optical cleaning of lithium niobate crystals. - Bonn, 2010. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5N-20310
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5N-20310
@phdthesis{handle:20.500.11811/4524,
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5N-20310,
author = {{Michael Kösters}},
title = {Optical cleaning of lithium niobate crystals},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2010,
month = mar,
note = {An all-optical method for the removal of photoexcitable electrons from photorefractive centers to get rid of optical damage in lithium niobate crystals is presented, the so-called "optical cleaning". The method combines the photovoltaic drift of electrons with ionic charge compensation at sufficiently high temperatures of about 180 °C. Optimum choice of the light pattern plus heat dramatically decreases the concentration of photoexcitable electrons in the exposed region leading to a suppression of optical damage. Experiments with slightly iron-doped lithium niobate crystals have shown an increase of the threshold for optical damage of more than 1000 compared to those of untreated crystals.},
url = {https://hdl.handle.net/20.500.11811/4524}
}
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5N-20310,
author = {{Michael Kösters}},
title = {Optical cleaning of lithium niobate crystals},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2010,
month = mar,
note = {An all-optical method for the removal of photoexcitable electrons from photorefractive centers to get rid of optical damage in lithium niobate crystals is presented, the so-called "optical cleaning". The method combines the photovoltaic drift of electrons with ionic charge compensation at sufficiently high temperatures of about 180 °C. Optimum choice of the light pattern plus heat dramatically decreases the concentration of photoexcitable electrons in the exposed region leading to a suppression of optical damage. Experiments with slightly iron-doped lithium niobate crystals have shown an increase of the threshold for optical damage of more than 1000 compared to those of untreated crystals.},
url = {https://hdl.handle.net/20.500.11811/4524}
}
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