Title
Experimental characterization of magneto-optical properties of Faraday crystal applied in magnetic field sensor
Creator
Abudagel, Giuma Saleh Isa, 1963- 21611623
Copyright date
2019
Object Links
Select license
Autorstvo-Nekomercijalno 3.0 Srbija (CC BY-NC 3.0)
License description
Dozvoljavate umnožavanje, distribuciju i javno saopštavanje dela, i prerade, ako se navede ime autora na način odredjen od strane autora ili davaoca licence. Ova licenca ne dozvoljava komercijalnu upotrebu dela. Osnovni opis Licence: http://creativecommons.org/licenses/by-nc/3.0/rs/deed.sr_LATN Sadržaj ugovora u celini: http://creativecommons.org/licenses/by-nc/3.0/rs/legalcode.sr-Latn
Language
English
Cobiss-ID
Theses Type
Doktorska disertacija
description
Datum odbrane: 07.03.2019.
Other responsibilities
mentor
Petričević, Slobodan, 1971- 14775143
član komisije
Stojković, Zlatan, 1960- 12559207
član komisije
Romčević, Nebojša, 1963- 8769895
član komisije
Mihailović, Peđa, 1973- 25418599
član komisije
Barjaktarević, Marko, 1978-
15814247
Academic Expertise
Tehničko-tehnološke nauke
University
Univerzitet u Beogradu
Faculty
Elektrotehnički fakultet
Alternative title
Eksperimentalna karakterizacija magneto-optičkih osobina Faradejevog kristala namenjenog za konstrukciju senzora magnetskog polja
Publisher
[G. Abudagel]
Format
103 lista
description
Electrical Engineering - Optoelectronics / Elektrotehnika i računarstvo - Optoelektronika
Abstract (en)
The thesis explores preparation and magneto properties of bismuth
germanium oxide single crystal (B12GeO20) which is irradiated by pulsed
femtosecond laser of increasing power. Analyses performed on irradiated and
un irradiated samples showed significant changes in transmittance, transmission
spectra, sample color, Raman spectra (RS), X-ray diffraction (XRD) pattern,
Verdet constant (VC), magneto-optical property and absorption coefficient. After
irradiation, the transmission spectra values increased whereas anisotropy
detected in the transmission spectra of unirradiated samples disappeared. The
change of color caused by irradiation was noticeable to the naked eye. The XRD
measurements confirmed structural changes induced by laser irradiation, i.e., the
laser- beam-incident side of the sample became almost amorphous, whereas the
side opposite to the incident can be indexed to the Bi12 Ge O20 compound.
Irradiation caused increase of Raman spectra peaks with the exception of crystal
peaks of type E, which disappeared. The femtosecond pulsed laser irradiation
can be used to improve bismuth germanium oxide single crystal optical
properties. Femtosecond pulsed laser irradiation can improve optical properties
of Bi12 GeO20 single crystals.
Abstract (sr)
Disertacija razmatra pripremu za proizvodnju i magneto optička
svojstva Bizmut germanijum oksidnih kristala (B12GeO20) koje se ozračuju
femtosekundnim laserskim impulsima zracima sa rastućom snagom. Analize
izvršene nad ozračenim i neozračenim uzorcima kristala pokazale su značajne
promene u transmitansi, transmisionom spektru, boji, Ramanovom spektru,
rezultatima difrakcije X zraka, Verdeovoj konstanti, magneto-optičkim
svojstvima i koeficijentu apsorpcije. Posle ozračivanja došlo je do porasta
transmitivnosti i izostanka anizotropije u transmisionom spektru u odnosu na
neozračene uzorke. Izmena boje uzoraka primetna je čak i golim okom. XRD
merenja pokazala su strukturne promene indukovane laserskim zracima tako da
je npr. strana uzorka neposredno ozračena laserom postala skoro potpuno
amorfna dok se suprotna strana uzorka indeksira na B12GeO20 jedinjenje.
Ozračivanje je izazvalo porast vrhova u Ramanovom spektru sa izuzetkom
vrhova za tip E koji se nisu pojavili. Femtosekundni laserski impulsi mogu se
iskoristiti da unaprede optička svojstva kristala...
Authors Key words
Faraday crystal, magnetic field sensor, delta/sigma normalization,
crystal temperature properties
Authors Key words
Faradejev kristal, senzor magnetskog polja, delta/sigma
normalizacija, temperaturska svojstva kristala
Type
Tekst
Abstract (en)
The thesis explores preparation and magneto properties of bismuth
germanium oxide single crystal (B12GeO20) which is irradiated by pulsed
femtosecond laser of increasing power. Analyses performed on irradiated and
un irradiated samples showed significant changes in transmittance, transmission
spectra, sample color, Raman spectra (RS), X-ray diffraction (XRD) pattern,
Verdet constant (VC), magneto-optical property and absorption coefficient. After
irradiation, the transmission spectra values increased whereas anisotropy
detected in the transmission spectra of unirradiated samples disappeared. The
change of color caused by irradiation was noticeable to the naked eye. The XRD
measurements confirmed structural changes induced by laser irradiation, i.e., the
laser- beam-incident side of the sample became almost amorphous, whereas the
side opposite to the incident can be indexed to the Bi12 Ge O20 compound.
Irradiation caused increase of Raman spectra peaks with the exception of crystal
peaks of type E, which disappeared. The femtosecond pulsed laser irradiation
can be used to improve bismuth germanium oxide single crystal optical
properties. Femtosecond pulsed laser irradiation can improve optical properties
of Bi12 GeO20 single crystals.
“Data exchange” service offers individual users metadata transfer in several different formats. Citation formats are offered for transfers in texts as for the transfer into internet pages. Citation formats include permanent links that guarantee access to cited sources. For use are commonly structured metadata schemes : Dublin Core xml and ETUB-MS xml, local adaptation of international ETD-MS scheme intended for use in academic documents.