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Development of an optical pulsing by using pockels effect

Laser produced from active medium is normally in continuous mode. The beam can be modulated by inserting switching mechanism. An electro-optic mechanism is one of the techniques used to alter the operation of laser beam from continuous into pulse mode. Hence, the objective of this project is to deve...

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Main Author: Thian, Lee Eng
Format: Thesis
Language:English
Published: 2005
Subjects:
QC Physics
Online Access:http://eprints.utm.my/id/eprint/4194/1/ThianLeeEngMFS2005.pdf
http://eprints.utm.my/id/eprint/4194/
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spelling my.utm.41942018-01-16T03:41:55Z http://eprints.utm.my/id/eprint/4194/ Development of an optical pulsing by using pockels effect Thian, Lee Eng QC Physics Laser produced from active medium is normally in continuous mode. The beam can be modulated by inserting switching mechanism. An electro-optic mechanism is one of the techniques used to alter the operation of laser beam from continuous into pulse mode. Hence, the objective of this project is to develop an optical switch system by using Pockels effect. Helium-Neon (He-Ne) laser was used as continuous light source in the project. Calcite and quartz crystals were employed as natural birefringent materials. While a synthetic birefringent material, lithium niobate was used as a Pockels cell. The lithium niobate crystal can become birefringent only through the application of electric field. Therefore, several pulse generators were developed and used to trigger an electrooptic driver to electrify the lithium niobate crystal. A Pockels cell house was designed and fabricated by using perspex. The Pockels cell house was completed with electrodes. The performance of the fabricated Pockels cell was compared to the commercial Pockels cell. Both of the Pockels cells exhibited similar characteristic, whereby the linear polarization state of laser light was turned into circular state when it entered the electrified Pockels cells with a : b ratio of 1.0 : 1.0 (2 kV and 3 kV voltage applied) and 1.1 : 1.0 (4 kV voltage applied). This converts the continuous He-Ne beam into pulse mode. The generation of the laser pulse can be operated either in a single or repetitive mode. It depends on the frequency of the pulse generator. The amplitude of the produced laser pulse was increased by increasing the voltage supplied to electrify the lithium niobate crystal. The amplitude of the produced laser pulse by using transverse Pockels cell was 500 mV, 700 mV and 1000 mV at 2 kV, 3 kV and 4 kV applied voltage. While the result obtained by using commercial Pockels cell was 700 mV, 900mV and 1200 mV. 2005-08 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/4194/1/ThianLeeEngMFS2005.pdf Thian, Lee Eng (2005) Development of an optical pulsing by using pockels effect. Masters thesis, Universiti Teknologi Malaysia, Faculty of Science.
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic QC Physics
spellingShingle QC Physics
Thian, Lee Eng
Development of an optical pulsing by using pockels effect
description Laser produced from active medium is normally in continuous mode. The beam can be modulated by inserting switching mechanism. An electro-optic mechanism is one of the techniques used to alter the operation of laser beam from continuous into pulse mode. Hence, the objective of this project is to develop an optical switch system by using Pockels effect. Helium-Neon (He-Ne) laser was used as continuous light source in the project. Calcite and quartz crystals were employed as natural birefringent materials. While a synthetic birefringent material, lithium niobate was used as a Pockels cell. The lithium niobate crystal can become birefringent only through the application of electric field. Therefore, several pulse generators were developed and used to trigger an electrooptic driver to electrify the lithium niobate crystal. A Pockels cell house was designed and fabricated by using perspex. The Pockels cell house was completed with electrodes. The performance of the fabricated Pockels cell was compared to the commercial Pockels cell. Both of the Pockels cells exhibited similar characteristic, whereby the linear polarization state of laser light was turned into circular state when it entered the electrified Pockels cells with a : b ratio of 1.0 : 1.0 (2 kV and 3 kV voltage applied) and 1.1 : 1.0 (4 kV voltage applied). This converts the continuous He-Ne beam into pulse mode. The generation of the laser pulse can be operated either in a single or repetitive mode. It depends on the frequency of the pulse generator. The amplitude of the produced laser pulse was increased by increasing the voltage supplied to electrify the lithium niobate crystal. The amplitude of the produced laser pulse by using transverse Pockels cell was 500 mV, 700 mV and 1000 mV at 2 kV, 3 kV and 4 kV applied voltage. While the result obtained by using commercial Pockels cell was 700 mV, 900mV and 1200 mV.
format Thesis
author Thian, Lee Eng
author_facet Thian, Lee Eng
author_sort Thian, Lee Eng
title Development of an optical pulsing by using pockels effect
title_short Development of an optical pulsing by using pockels effect
title_full Development of an optical pulsing by using pockels effect
title_fullStr Development of an optical pulsing by using pockels effect
title_full_unstemmed Development of an optical pulsing by using pockels effect
title_sort development of an optical pulsing by using pockels effect
publishDate 2005
url http://eprints.utm.my/id/eprint/4194/1/ThianLeeEngMFS2005.pdf
http://eprints.utm.my/id/eprint/4194/
_version_ 1643643991788355584
score 13.211869

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