Design and construction of a passively Q-switched Nd-YAG pumped UV laser and study its non-linear parameters
Dissertant
Thesis advisor
Chiad, Baha T.
al-Wattar, Abbas Jasim Hammadi
Comitee Members
Bassam, Sudud Salman Ahmad
Abd al-Wahhab, Hasan Numan
Rashid, Wasfi H.
Twij, Wisam Abd Ali
University
University of Baghdad
Faculty
College of Science
Department
Department of Physics
University Country
Iraq
Degree
Ph.D.
Degree Date
2013
English Abstract
An ultraviolet laser at 355nm was designed and implemented by extra-cavity frequency tripling of a passively Q-switched Nd-YAG laser with 1064nm wavelength.
Type I critically phase matched b -Barium Borate (BBO) and Lithium triborate (LBO) nonlinear crystals were used for second harmonic generation (SHG) and type II critically phase matched LBO nonlinear crystal was used for sum frequency generation (SFG) to obtain third harmonic generation (THG).
With a pumping energy of a 24 mJ at 1064nm the maximum second harmonic energy per pulse have been generated were 3.68mJ and 3.14mJ at 532nm for BBO and LBO crystals which corresponds a conversion efficiencies of ( ~15.95% & ~13.81%) respectively.
A walk-off compensated configurations in SHG with twin LBO type I crystals and non-twin type I crystals (BBO and LBO) in two configurations nonwalkoff compensation (NWOC) and walkoff compensation (WOC) schemes were achieved.
The conversion efficiency enhancement factors for non-twin crystals are (~1.3 & ~1.8), while that for twin LBO crystals are (~1.22 &~ 2.4).
A 1.06mJ and 1.176mJ third harmonic energy generated at 355nm UV using two crystals one for SHG and the other for SFG have been obtained which corresponds the maximum conversion efficiencies of (~4.41% and ~4.9%) for BBO-LBO and LBO-LBO crystal arrangements respectively.
The maximum third harmonic conversion efficiency enhancement factors obtained due to enhancements in the first stage(SHG) for non-twin crystals on WOC schemes were (~1.9 &~2.5 10 ),while that for twin crystals on the same scheme were (~1.3 &~1.8) respectively.
The maximum third harmonic Conversion efficiency obtained due to an enhancement in the SFG stage using twin-crystal on WOC scheme were 6.1% which gives an enhancement factor of 1.25.
The temporal and spatial beam profiles of the various laser beams generated in the system have been investigated using 2D and 3D image.
Main Subjects
No. of Pages
141
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Theoretical part.
Chapter Two : Experimental part.
Chapter Three : Results and discussion.
References.
American Psychological Association (APA)
Muhsin, Abd al-Nabi Hasan. (2013). Design and construction of a passively Q-switched Nd-YAG pumped UV laser and study its non-linear parameters. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-607654
Modern Language Association (MLA)
Muhsin, Abd al-Nabi Hasan. Design and construction of a passively Q-switched Nd-YAG pumped UV laser and study its non-linear parameters. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad. (2013).
https://search.emarefa.net/detail/BIM-607654
American Medical Association (AMA)
Muhsin, Abd al-Nabi Hasan. (2013). Design and construction of a passively Q-switched Nd-YAG pumped UV laser and study its non-linear parameters. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-607654
Language
English
Data Type
Arab Theses
Record ID
BIM-607654
