Researcher:
Kalaycıoğlu, Hamit

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PhD Student

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Hamit

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Kalaycıoğlu

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Kalaycıoğlu, Hamit

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2005 - 201020

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    Low-power skin welding by thulium (Tm:YAP) laser at 1980-NM
    (IEEE, 2009) Bilici, Temel; Tabakoglu, Ozgur; Gulsoy, Murat; Department of Physics; Department of Physics; N/A; Sennaroğlu, Alphan; Kurt, Adnan; Kalaycıoğlu, Hamit; Faculty Member; Teaching Faculty; PhD Student; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; 23851; 194455; N/A
    Laser skin welding is an invasive method of bonding skin tissues by temperature increase due to laser energy. In this study, a continuous-wave Tm:YAP laser at 1980 nm was designed as a versatile laser system for laser tissue welding. Due to higher water absorption near 1980 nm, lower power levels of Tm:YAP lasers (compared to smaller wavelength lasers) are enough for tissue welding and no solder is necessary to increase the absorption effect. This decreases the operation time and adverse effects due to solders. 2-mum lasers are also considered to be in the "eye-safe" region, which makes them more suitable for clinical applications.
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    Tensile strength analysis of laser skin welding performed with thulium laser system
    (Optical Society of America, 2010) Bilici, Temel; Topaloğlu, Nermin; Tabakoğlu, Özgur; Gülsoy, Murat; Department of Physics; Department of Physics; N/A; Sennaroğlu, Alphan; Kurt, Adnan; Kalaycıoğlu, Hamit; Faculty Member; Teaching Faculty; PhD Student; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; 23851; 194455; N/A
    Laser skin welding was performed with a thulium laser system (35 W/cm2). Tensile strength analysis shows that the thulium laser system at 1980 nm provided stronger welds than the closure by suture technique.
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    Skin tissue ablation by thulium (TM: yap) laser at 1980nm
    (Optical Society of America, 2009) Bilici, Temel; Tabakoğlu, Özgur; Gülsoy, Murat; Department of Physics; Department of Physics; N/A; Sennaroğlu, Alphan; Kurt, Adnan; Kalaycıoğlu, Hamit; Faculty Member; Teaching Faculty; PhD Student; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; 23851; 194455; N/A
    In this study, a Tm:YAP laser system with power output up to 1 W and emission wavelength of 1980 nm was established and its ablation parameters on Wistar rat skin tissues were analyzed to determine the optimum skin ablation dose.
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    Spectroscopic investigation of Tm3+: TeO2-WO3 glass
    (Elsevier Science Bv, 2008) Özen, Gönül; N/A; N/A; N/A; Department of Physics; Kalaycıoğlu, Hamit; Çankaya, Hüseyin; Çizmeciyan, Melisa Natali; Sennaroğlu, Alphan; PhD Student; Researcher; PhD Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; N/A; 23851
    We studied the spectroscopic characteristics of telluride glass with the host composition (0.85)TeO2–(0.15)WO3, containing 0.25 and 1.0 mol% thulium oxide (Tm2O3). By analyzing the absorption spectra with the Judd–Ofelt theory, the average radiative lifetimes of 305±7.5 μs and 1.95±0.02 ms were determined for the 3F4 and 3H4 levels, respectively. Measured fluorescence lifetime of the 3F4 level decreased from 218 to 51 μs for the 0.25 and 1.0 mol% Tm2O3 doped samples, respectively, indicating the effect of boosted non-radiative decay at higher doping concentrations. A similar trend was observed for the 3H4 level, where the fluorescence lifetime decreased from 1.86 ms to 350 μs at these concentrations. The quenching of the 1460 nm (3F4→3H4) emission in favor of the 1800 nm (3H4→3H6) emission due to cross relaxation was further evident in the fluorescence spectra of the samples. The calculated stimulated emission cross sections (3.73±0.1×10−21 cm2 at 1460 nm and 6.57±0.07×10−21 cm2 at 1808 nm) reveal the potential importance of the Tm3+:(0.85)TeO2–(0.15)WO3 glass for applications in fiber-optic amplifiers and fiber lasers.
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    Skin tissue ablation by thulium (Tm:YAP) laser at 1980NM
    (IEEE, 2009) Bilici, Temel; Tabakoğlu, Özgur; Gülsoy, Murat; Department of Physics; Department of Physics; N/A; Sennaroğlu, Alphan; Kurt, Adnan; Kalaycıoğlu, Hamit; Faculty Member; Teaching Faculty; PhD Student; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; 23851; 194455; N/A
    In this study, a Tm:YAP laser system with power output up to 1 W and emission wavelength of 1980 nm was established and its ablation parameters on Wistar rat skin tissues were analyzed to determine the optimum skin ablation dose.
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    Influence of doping concentration on the power performance of diode-pumped continuous-wave Tm 3+:YAlO 3 lasers
    (IEEE-Inst Electrical Electronics Engineers Inc, 2005) N/A; N/A; Department of Physics; Department of Physics; Kalaycıoğlu, Hamit; Sennaroğlu, Alphan; Kurt, Adnan; PhD Student; Faculty Member; Teaching Faculty; Department of Physics; Graduate School of Sciences and Engineering; College of Sciences; College of Sciences; N/A; 23851; 194455
    We investigated the effect of thulium ion concentration on the continuous-wave (CW) power performance of diode single-end-pumped thulium-doped YAlO3 (Tm:YAP) lasers. Three samples with 1.5%, 3%, and 4% Tm3+ concentration were examined at 18 ◦C. Lifetime and fluorescence measurements were further performed to assess the strength of cross relaxation and nonradiative decay. Our results showed that in single-end-pumped configurations, the best CW power performance was obtained with the 1.5% Tm:YAP sample, and laser performance of the samples degraded monotonically with increasing Tm3+ concentration. By using 9.5 W of incident pump power at 797 nm, a maximum of 1430 mW of output power was obtained with the 1.5% Tm:YAP sample and 2% output coupler. We discuss how the effects of cross relaxation, reabsorption, nonradiative decay, and internal heating vary with increasing concentration. Spectroscopic measurements and rate-equation analysis suggest that cross relaxation should already be effective in samples with 1.5% Tm3+ ion concentration and doping concentrations larger than 4% will lead to degradation in power performance due to higher nonradiative decay rates and larger reabsorption losses.
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    Comparative investigation- of diode-pumped Tm3+;YAIO 3 lasers: Influence of doping concentration
    (The Optical Society (OSA) Publishing, 2005) N/A; Department of Physics; Department of Physics; N/A; Kurt, Adnan; Sennaroğlu, Alphan; Kalaycıoğlu, Hamit; Teaching Faculty; Faculty Member; PhD Student; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; 194455; 23851; N/A
    We experimentally investigated the performance of diode-wing-pumped Tm:Y3Al5O12 crystalline laser operating at around 2 μm. By systematically making comparisons of laser performance in addition to the laser spectra features between composite and non-composite crystals with two different active segments length, we believed that using diffusion-bonded crystal with shorter Tm3+-doped active segment would be a feasible approach for simultaneously up-scaling the output power and slope efficiency in terms of reducing the reabsorption loss and thermal lensing effects.
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    Laser action in bulk Nd3+-doped telluride glass
    (IEEE, 2008) Özen, Gonul; Ovecoglu, Lutfu; N/A; N/A; N/A; Department of Physics; Kalaycıoğlu, Hamit; Çankaya, Hüseyin; Sennaroğlu, Alphan; PhD Student; Researcher; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; 23851
    We report on the first observation of lasing in bulk Nd 3+ -doped (0.8)TeO 2 -(0.2)WO 3 glass at 1065 nm. Gain-switched operation was obtained with a slope efficiency of 12% at a pulse repetition rate of 1 kHz.
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    Corneal tissue welding of clear corneal cut with infrared laser irradiation at different wavelengths
    (Turkish Ophthalmological Society, 2009) Rasier, Rifat; Ozeren, Mediha; Artunay, Ozgur; Bahcecioglu, Halil; Seckin, Ismail; Kurt, Adnan; Gulsoy, Murat; Department of Physics; N/A; Sennaroğlu, Alphan; Kalaycıoğlu, Hamit; Faculty Member; PhD Student; Department of Physics; College of Sciences; Graduate School of Sciences and Engineering; 23851; N/A
    Purpose: The aim of the study is to investigate the potential of infrared lasers for cornea welding in order to seal corneal cuts done during cataract surgery Method: Clear corneal cuts were laser (1070-nm) and Tm: YAP laser (1980-nm) were applied on full thickness corneal tissue of freshly enucleated 40 bovine eyes. Optimal laser power, wavelength and exposure time parameters for immediate closure with minimal thermal damage was estimated through histological examination of welded samples with hematoxylin-eosin staining. Ten corneas with 1070-nm and ten corneas with 1980-nm wavelengths were compared with best paremeters. Results: Full thickness welding results to sample sizes were the following: 2 out of 7 with 809-nm diode laser; 2 out of 7 with 980-nm diode laser; 2 out of 3 with 1070-nm YLF; and 4 out of 6 with 1980-nm Tm: YAP laser. According to histologic examination 1070-nm and 1980-nm wavelengths which results had less carbonization and less change in substantia cornea compard; 5 out of 10 corneas were full thickness welded with 1070-nm and 4 out of 10 corneas were partial welded with 1980-nm. Discussion: Our study suggested that 809-nm diode laser welding in association with the topical application of ICG is a valid method for the closure of corneal tissues but 908-nm, 1070-nm diode laser and 1980-nm Tm: YAP laser welding without topical application of any chromophores are other promising options and have a great potential for corneal laser welding.
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    Comparative investigation of diode-pumped Tm3+: YAlO3 lasers: influence of doping concentration
    (The Optical Society (OSA) Publishing, 2005) N/A; Department of Physics; Department of Physics; N/A; Kurt, Adnan; Sennaroğlu, Alphan; Kalaycıoğlu, Hamit; Teaching Faculty; Faculty Member; PhD Student; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; 194455; 23851; N/A
    We investigated the effect of thulium ion concentration on the continuous-wave power performance of diode single-end-pumped Tm3+:YAlO3 (Tm:YAP) lasers operating at 2 µm by using crystals with 1.5%, 3%, and 4% Tm3+ concentration. Best results were obtained with the 1.5% Tm3+:YAP crystal. Spectroscopic measurements and rate-equation analysis suggest that cross relaxation should already be effective at 1.5% Tm3+ concentration. Increase in reabsorption losses, non-radiative decay rates, and internal heating are likely causes of power degradation with increasing ion concentration. By using the laser efficiency data, the effective stimulated emission cross section was determined to be 4.2×10−21 cm2 at 1.94 µm, in agreement with previous results.