The Role of Defects on the Transition From Saturable Absorption To Nonlinear Absorption of Bi<sub>12</Sub>geo<sub>20< Single Crystal Under Increasing Laser Excitation

dc.authorid Gasanly, Nizami/0000-0002-3199-6686
dc.authorid KARATAY, Ahmet/0000-0001-9373-801X
dc.authorid Isik, Mehmet/0000-0003-2119-8266
dc.authorscopusid 57210148812
dc.authorscopusid 23766993100
dc.authorscopusid 57215491663
dc.authorscopusid 57189464609
dc.authorscopusid 35580905900
dc.authorscopusid 7004592418
dc.authorwosid Isik, Mehmet/KMY-5305-2024
dc.authorwosid Gasanly, Nizami/HRE-1447-2023
dc.authorwosid KARATAY, Ahmet/C-9985-2018
dc.contributor.author Pepe, Yasemin
dc.contributor.author Isik, Mehmet
dc.contributor.author Karatay, Ahmet
dc.contributor.author Yildiz, Elif Akhuseyin
dc.contributor.author Gasanly, Nizami
dc.contributor.author Elmali, Ayhan
dc.contributor.other Department of Electrical & Electronics Engineering
dc.date.accessioned 2024-07-05T15:24:27Z
dc.date.available 2024-07-05T15:24:27Z
dc.date.issued 2022
dc.department Atılım University en_US
dc.department-temp [Pepe, Yasemin; Karatay, Ahmet; Yildiz, Elif Akhuseyin; Elmali, Ayhan] Ankara Univ, Fac Engn, Dept Engn Phys, TR-06100 Ankara, Turkey; [Isik, Mehmet] Atilim Univ, Dept Elect & Elect Engn, TR-06836 Ankara, Turkey; [Gasanly, Nizami] Middle East Tech Univ, Sci & Art Fac, Dept Phys, TR-06800 Ankara, Turkey en_US
dc.description Gasanly, Nizami/0000-0002-3199-6686; KARATAY, Ahmet/0000-0001-9373-801X; Isik, Mehmet/0000-0003-2119-8266 en_US
dc.description.abstract This work reports defect and input intensity dependent nonlinear optical behaviors of Bi12GeO20 (BGO) single crystal. Open aperture (OA) Z-scan experiments were performed with 532 nm excitation wavelength under 4 ns and 100 fs pulsed laser irradiation. Obtained data were fitted with a theoretical model considering one-photon, two-photon and free carrier absorption contributions to nonlinear absorption due to longer lifetime of localized defect states than that of used laser pulse durations. At low input intensities, the BGO single crystal showed saturable absorption (SA) behavior and transition to nonlinear absorption (NA) behavior observed with further increase of the input intensities both of pulse durations. At low input intensity, the OPA mechanism is dominant and results in SA by filling of the defect states due to defect state at around one photon energy (2.32 eV). At higher input intensity, multi-photon, two-photon and free carrier absorption become dominant mechanisms, and nonlinear absorption behavior was observed. The lowest saturation threshold was found as 1.36 x 1010 W/cm2 with nanosecond pulses. We have revealed the mechanisms contributing both SA and NA, and determined saturation intensity threshold and effective nonlinear absorption coefficients. Our findings indicate that the tails of defect states overlap in the energy band gaps especially in sufficiently disordered crystal. With this way, the spectral range for saturable absorption and nonlinear absorption can be broadened. en_US
dc.identifier.citationcount 7
dc.identifier.doi 10.1016/j.jlumin.2022.119170
dc.identifier.issn 0022-2313
dc.identifier.issn 1872-7883
dc.identifier.scopus 2-s2.0-85135880181
dc.identifier.uri https://doi.org/10.1016/j.jlumin.2022.119170
dc.identifier.uri https://hdl.handle.net/20.500.14411/2434
dc.identifier.volume 251 en_US
dc.identifier.wos WOS:000861371700006
dc.identifier.wosquality Q2
dc.institutionauthor Işık, Mehmet
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.publicationcategory Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı en_US
dc.rights info:eu-repo/semantics/closedAccess en_US
dc.scopus.citedbyCount 17
dc.subject Bi12GeO20 crystal en_US
dc.subject Nonlinear absorption en_US
dc.subject Saturable absorption en_US
dc.subject Femtosecond transient absorption en_US
dc.subject Optical limiting en_US
dc.title The Role of Defects on the Transition From Saturable Absorption To Nonlinear Absorption of Bi<sub>12</Sub>geo<sub>20< Single Crystal Under Increasing Laser Excitation en_US
dc.type Article en_US
dc.wos.citedbyCount 18
dspace.entity.type Publication
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