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Arpali, Serap

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https://hdl.handle.net/20.500.12416/9046
Name Variants
Arpali, S.A.
Altay Arpalı, Serap
Arpali, Serap Altay
Arpali, Serap A.
Altay, Serap
Arpali, S. A.
Arpali, Serap Altay
Arpali, Serap Altay
Arpali, Serap Altay
Job Title
Dr. Öğr. Üyesi
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Main Affiliation
06.02. Elektronik ve Haberleşme Mühendisliği
06. Mühendislik Fakültesi
01. Çankaya Üniversitesi
06.02. Elektronik ve Haberleşme Mühendisliği
Elektronik ve Haberleşme Mühendisliği
06. Mühendislik Fakültesi
01. Çankaya Üniversitesi
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Former Staff
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Scholarly Output

29

Articles

19

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1734/632

Supervised MSc Theses

1

Supervised PhD Theses

0

WoS Citation Count

392

Scopus Citation Count

412

WoS h-index

9

Scopus h-index

11

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0

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0

WoS Citations per Publication

13.52

Scopus Citations per Publication

14.21

Open Access Source

4

Supervised Theses

1

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JournalCount
Journal of Modern Optics4
Optical Review2
Applied Physics B2
CLEO: Science and Innovations, CLEO_SI 2013 -- CLEO: Science and Innovations, CLEO_SI 2013 -- 9 June 2013 through 14 June 2013 -- San Jose, CA -- 1005481
Conference on Lasers and Electro-Optics (CLEO) -- JUN 09-14, 2013 -- San Jose, CA1
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Now showing 1 - 10 of 29
  • Thumbnail Image
    Conference Object
    Citation - WoS: 5
    Citation - Scopus: 6
    Propagation of Optical Flat-Topped Gaussian Beams in Satellite Links
    (Ieee, 2009) Kamacioglu, Canan; Arpali, Serap A.; Baykal, Yahya; Yazgan, Erdem
    Propagation of optical flat-topped Gaussian beams in earth-satellite optical communication links is investigated where part of the link is turbulent atmosphere. Flat-topped Gaussian source field is obtained by superposing many Gaussian beams of different source size. Starting with the flat-topped Gaussian incidence at the earth surface, the average intensity at the satellite is formulated by using the extended Huygens Fresnel principle. For the structure constant variation versus height, Hufnagel-Valley model is employed in the vertical and slant paths. The received average intensity is numerically calculated and the effects of the source and medium parameters on the received average intensity profile are examined for different zenith angles. In earth-satellite optical communications links, the advantages of using flat-topped Gaussian beams as compared to Gaussian beams are scrutinized.
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    Article
    Citation - WoS: 48
    Citation - Scopus: 50
    High-Throughput Screening of Large Volumes of Whole Blood Using Structured Illumination and Fluorescent On-Chip Imaging
    (Royal Soc Chemistry, 2012) Arpali, Serap Altay; Arpali, Caglar; Coskun, Ahmet F.; Chiang, Hsin-Hao; Ozcan, Aydogan
    Undiluted blood samples are difficult to image in large volumes since blood constitutes a highly absorbing and scattering medium. As a result of this limitation, optical imaging of rare cells (e.g., circulating tumour cells) within unprocessed whole blood remains a challenge, demanding the use of special microfluidic technologies. Here we demonstrate a new fluorescent on-chip imaging modality that can rapidly screen large volumes of absorbing and scattering media, such as undiluted whole blood samples, for detection of fluorescent micro-objects at low concentrations (for example <= 50-100 particles/mL). In this high-throughput imaging modality, a large area microfluidic device (e.g., 7-18 cm(2)), which contains for example similar to 0.3-0.7 mL of undiluted whole blood sample, is directly positioned onto a wide-field opto-electronic sensor-array such that the fluorescent emission within the microchannel can be detected without the use of any imaging lenses. This microfluidic device is then illuminated and laterally scanned with an array of Gaussian excitation spots, which is generated through a spatial light modulator. For each scanning position of this excitation array, a lensfree fluorescent image of the blood sample is captured using the opto-electronic sensor-array, resulting in a sequence of images (e.g., 144 lensfree frames captured in similar to 36 s) for the same sample chip. Digitally merging these lensfree fluorescent images based on a maximum intensity projection (MIP) algorithm enabled us to significantly boost the signal-to-noise ratio (SNR) and contrast of the fluorescent micro-objects within whole blood, which normally remain undetected (i.e., hidden) using conventional uniform excitation schemes, involving plane wave illumination. This high-throughput on-chip imaging platform based on structured excitation could be useful for rare cell research by enabling rapid screening of large volume microfluidic devices that process whole blood and other optically dense media.
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    Article
    Citation - WoS: 77
    Citation - Scopus: 73
    Simulator for General-Type Beam Propagation in Turbulent Atmosphere
    (Optical Soc Amer, 2006) Arpali, Caglar; Yazicioglu, Canan; Eyyuboglu, Halil Tanyer; Arpali, Serap Altay; Baykal, Yahya
    A simulator is designed in MATLAB code which gives the propagation characteristics of a general-type beam in turbulent atmosphere. When the required source and medium parameters are entered, the simulator yields the average intensity profile along the propagation axis in a video format. In our simulator, the user can choose the option of a "user defined beam" in which the source and medium parameters are selected as requested by the user by entering numerical values in the relevant menu boxes. Alternatively, the user can proceed with the option of "pre-defined beam" in which the average intensity profiles of beams such as annular, cos-Gaussian, sine-Gaussian, cosh-Gaussian, sinh-Gaussian, their higher-order counterparts and flat-topped can be observed as they propagate in a turbulent atmosphere. Some samples of the simulator output are presented. (c) 2006 Optical Society of America
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    Conference Object
    Citation - WoS: 2
    Citation - Scopus: 3
    Ber for Higher Order Laser Modes in Optical Wireless Underwater Communications
    (Ieee, 2016) Arpali, Serap Altay; Baykal, Yahya; Arpali, Caglar
    Average bit error rate () of an underwater optical communication system is analyzed for higher order laser beams. For this purpose, the effects of oceanic turbulence parameters and link parameters on single mode higher order laser beams are investigated.
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    Article
    A comparison of iterative Fourier transform algorithms for image quality estimation
    (2018) Alsaka, Dina Yaqoob; Arpali, Çağlar; Arpali, Serap Altay
    A comparison was established between two iterative Fourier transform algorithms (IFTAs), such as the original Gerchberg–Saxton (GS) and the mixed-region amplitude freedom (MRAF) algorithms, for the hologram reconstruction of different target images through the full reference image quality estimation (IQE) and pixel homogeneity in the Fourier plane presented theoretically and experimentally. The comparison was applied depending upon both algorithms based on a computer-generated hologram (CGH) implemented utilizing a reflective phase-modulated liquid-crystal spatial light modulator (LC-SLM) to obtain the digital kinoform holograms of the desired intensity distributions. These digital holograms were applied to reconstruct the intensity patterns for 852 nm, which represents a laser beam source. The theoretical and experimental results of the reconstructed patterns obtained using the MRAF algorithm were found to be smoother and better than the patterns obtained using the GS algorithm. Unmodulated light beam (dc term) is removed from the reconstructed patterns attributed to digital kinoform holograms of MRAF algorithm as an alternative to the theoretical and experimental results without using any additional optic equipment at the light path. Moreover, this paper discussed the full reference objective quality estimations, such as mean square error (MSE), peak signal-to-noise ratio (PSNR), structural content (SC), normalized absolute error (NAE), normalized cross correlation (NK), and homogeneity of pixels, through the contrast (Cont) and inverse difference moment (IDM) for numerical and experimental results. According to the two desired intensity distributions processed theoretically and experimentally, the results of MRAF algorithm were found to be in the highly accurate recovered phase, the quality of image was enhanced, and the dc term was decreased. Image quality estimation of full reference objective relay on the feedback algorithms experimental attestation has not been implemented yet.
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    Article
    Propagation Characteristics of Higher-Order Annular Gaussian Beams in Oceanic Turbulence
    (Institute of Physics, 2025) Arpali, S.A.; Arpali, Ç.; Baykal, Y.
    This study aims to explore the propagation characteristics of higher-order annular Gaussian (HOAG) beams in oceanic turbulence. We provide an analytical derivation of the average intensity at the receiver plane based on excitation from a HOAG source field. Additionally, we conduct a detailed analyses of various beam intensity moments including kurtosis parameter, power-in-the-bucket (PIB) and the beam size variation. As oceanic turbulence strength increases, the HOAG beam gradually transforms into a pure Gaussian beam. As the strength of turbulence increases, PIB values for all modes of HOAG beams gradually decrease in an exponential manner until they stabilize, exhibiting behavior similar to that of Gaussian beams. It is also observed that modes of HOAG beams having larger mode numbers carry less energy to the receiver compared to lower-order modes as turbulence strength increases. Analyses of the kurtosis parameter for HOAG beams indicate that during propagation over intermediate distances, there is a tendency for more beam energy to be distributed toward the wings rather than to the center. In contrast, at longer distances, the beam redistributes its energy, resulting in a lower energy concentration in the wings compared to the center. This research can enhance our understanding of the effects of higher-order laser beams, thereby potentially facilitating longer communication distances in underwater wireless optical communication technologies. © 2025 IOP Publishing Ltd.
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    Article
    Citation - WoS: 8
    Citation - Scopus: 7
    Bit Error Rate of a Gaussian Beam Propagating Through Biological Tissue
    (Taylor & Francis Ltd, 2020) Arpali, Serap Altay; Arpali, Caglar; Baykal, Yahya
    The scintillation index and bit error rate (BER) of a Gaussian beam propagating in a weakly turbulent soft tissue are formulated and analysed numerically. The scintillation indices are plotted against half of the measured slope in the range of power-law scaling at different tissue parameters, such as the random variations in the refractive index of the tissue, outer scale of the tissue turbulence and the tissue length between the optical source and the detector. Moreover, BERs of Gaussian beams against the signal to noise ratio (SNR) are examined for different tissue parameters. Our graphical results show that the scintillation index and BER increase with larger outer scales, longer tissue lengths and larger random variations in the refractive index of the tissue. In comparison with the spherical wave propagation, it was found that Gaussian beam yields larger scintillation index and BER values.
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    Article
    Citation - WoS: 2
    Citation - Scopus: 1
    Propagation of Higher-Order Annular Gaussian Beams in Biological Tissues
    (Optica Publishing Group, 2025) Arpali, Serap Altay; Baykal, Yahya Kemal
    The propagation characteristics of a higher-order annular Gaussian (HOAG) beam in biological tissue turbulence are investigated. Average intensity at the receiver plane is found when the HOAG source field is used as excitation. The effects of the HOAG beam on different tissue types of the upper dermis (human), liver parenchyma (mouse), intestinal epithelium (mouse), and deep dermis (mouse) are studied. Variations of the average intensity versus the source and medium parameters such as the strength coefficient of the refractive-index fluctuations, propagation distance, wavelength, and beam size are presented. The results show that all modes of the HOAG beam can successively transmit beam energy at different levels of turbulence for all tissue types. At the same turbulence strength, HOAG beams having larger mode numbers transmit higher intensity to receivers than the modes with smaller mode orders, which is valid for all the examined tissue types. As the strength of tissue turbulence increases, the HOAG beam slowly turns into a pure Gaussian beam. For the different tissue types, the highest beam intensity at the receiver was observed for the deep dermis (mouse) tissue type. Despite the change in wavelength, refractive-index fluctuations, and source beam size, the highest beam transmission through the tissue in a turbulent environment was also observed for this same tissue type. This research may be useful in understanding the fundamentals of lighttissue interaction of HOAG laser beams, which may improve noninvasive disease detection and therapy methods through tissue in biophotonic technologies. (c) 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
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    Article
    Yumuşak Doku İçerisinde Yayılan Küresel Dalganın Performans Analizi
    (2021) Arpali, Serap Altay
    Bu çalışmada, yumuşak doku içerisinde yayılan küresel dalganın performansını analiz edebilmek için, optiksel küresel dalganın bit-hata-olasılığını (BER) inceledik. Bu kapsamda, optiksel küresel dalganın ortalama BER’i (), yumuşak dokunun kırınım indeksindeki rastgele değişimleri, kaynak ve detektör arasındaki doku uzunluğu, büyük ölçekli doku türbülansı gibi değişik doku ve türbülans parametrelerine bağlı olarak ayrıntılı olarak çalışılmıştır. Çalışmanın sonucunda doku türbülansının büyük ölçek değeri, doku uzunluğu ve yumuşak dokunun kırınım indeksindeki rastgele değişimleri arttıkça değeri artmıştır. Ayrıca optiksel küresel dalganın değerleri üstel ölçek kuralının sınırları içinde belirlenen eğimin yarı değerinin farklı büyüklükleri için incelenmiştir. Üstel ölçek kuralının sınırları içinde belirlenen eğimin yarı değerinin farklı büyüklüklerinin azalan değerleri için küresel dalganın ’nin düştüğü gözlemlenmiştir.
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    Article
    Citation - WoS: 22
    Citation - Scopus: 20
    Scintillation Index of Optical Spherical Wave Propagating Through Biological Tissue
    (Taylor & Francis Ltd, 2017) Baykal, Yahya; Arpali, Caglar; Arpali, Serap Altay
    Effects of the tissue turbulence on the propagation of an optical spherical wave are analysed. For this purpose, scintillation index of an optical spherical wave which is propagating in a soft tissue is formulated and evaluated in weakly turbulent soft tissue. Scintillation index of the optical spherical wave is examined against the changes in the tissue parameters which are the tissue length between the optical spherical wave source and the detector, random variations in the refractive index of the tissue and the outer scale of the tissue turbulence. According to our graphical outputs, it is observed that increase in the random variations of the refractive index of the tissue results in an increase in the scintillation index at a certain realization of the turbulence spectrum. On the other hand, larger outer scales and longer tissue lengths yield larger scintillations. The variation of the scintillation index of the optical spherical wave versus the wavelength is also investigated. It is found that at small tissue lengths, wavelength has almost no effect on the scintillations; however, when the tissue length reaches a certain value, shorter wavelengths give rise to larger intensity fluctuations.