Researcher:
Konca, Ali Özgün

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Undergraduate Student

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Ali Özgün

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Konca

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Konca, Ali Özgün

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1999 - 20005

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Researcher Of Publications: search.filters.isAuthorOfPublication.a018215a-2b2b-4c76-b4be-328191409fd1

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    Power performance of a continuous-wave Cr2+:ZnSe laser at 2.47 μm
    (Optical Soc America, 2000) Department of Physics; Department of Physics; N/A; Sennaroğlu, Alphan; Konca, Ali Özgün; Pollock, Clifford R.; Faculty Member; Undergraduate Student; Other; Department of Physics; College of Sciences; College of Sciences; N/A; 23851; 156098; N/A
    Continuous-wave power performance of a Cr2+:ZnSe laser was investigated at 2.474 mum. End pumped by a 1.583-mum NaCl:OH- laser. the resonator with a 3% transmitting output coupler produced as high as 250 mW of output power with a slope efficiency of 24.2%. Analysis of the laser efficiency data shows that the magnitude of the excited-state absorption cross section is less than 5% of the emission cross section in agreement with spectroscopic results. Numerical calculations further predict the optimum crystal length and absorption coefficient to be 2.5 cm and 0.49 cm(-1), respectively, for continuous-wave operation.
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    Optimum crystal parameters for room-temperature Cr4+: Forsterite lasers: threshold and finite-power analysis
    (Optical Soc America, 1999) Department of Physics; Department of Physics; Sennaroğlu, Alphan; Konca, Ali Özgün; Faculty Member; Undergraduate Student; Department of Physics; College of Sciences; College of Sciences; 23851; 156098
    A novel model was used to analyze the experimental threshold and efficiency data of continuous-wave Cr4+:forsterite lasers operated around room temperature by taking into account the temperature dependence of the fluorescence lifetime, pump absorption saturation, and excited-state absorption at the lasing wavelength. The best-fit values of the stimulated emission cross-section and the excited-state absorption cross-section were determined to be 1.23x10(-19) cm(2) and 0.26x10(-19) cm(2), respectively. The numerical calculations further predict the optimum crystal length and absorption coefficient to be 2 cm and 0.34 cm(-1) for room-temperature Cr4+:forsterite lasers.
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    Power performance of a continuous-wave Cr2+: ZnSe laser at 2.4 7 μm
    (Optica Publishing Group, 2000) Pollock, Clifford R.; Department of Physics; Department of Physics; Sennaroğlu, Alphan; Konca, Ali Özgün; Faculty Member; Undergraduated Student; Department of Physics; College of Sciences; College of Sciences; 23851; 156098
    Continuous-wave power performance of a Cr2+:znSe laser was investigated at 2.474 μm. End pumped by a 1.583-μm NaCl:OH- laser, the resonator with a 3% transmitting output coupler produced as high as 250 mW of output power with a slope efficiency of 24.2%. Analysis of the laser efficiency data shows that the magnitude of the excited-state absorption cross section is less than 5% of the emission cross section in agreement with spectroscopic results. Numerical calculations further predict the optimum crystal length and absorption coefficient to be 2.5 cm and 0.49 cm-1, respectively, for continuous-wave operation.
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    Optimization of room-temperature continuous-wave Cr4+: Y AG lasers: experiment and modeling
    (Optical Soc America, 2000) Department of Physics; Department of Physics; Sennaroğlu, Alphan; Konca, Ali Özgün; Faculty Member; Undergraduate Student; Department of Physics; College of Sciences; College of Sciences; 23851; 156098
    Experimental and numerical methods were employed to investigate the influence of thermal effects in room-temperature continuous-wave Cr4+:YAG lasers. Pump saturation, laser threshold, and laser efficiency data were first analyzed by accounting for the temperature dependence of the fluorescence lifetime, pump-induced heating in the gain medium, excited-state absorption at the lasing wavelength, and saturation effects. Best-fit values of the absorption, emission, and excited-state absorption cross sections were determined to be 11.2x10(-19) cm(2), 0.47x10(-19) cm(2), and 0.093x10(-19) cm(2), respectively. Based on the best-fit cross-section values, numerical calculations show that the optimum crystal length and absorption coefficient are 2 cm and 0.56 cm(-1), respectively.
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    PublicationOpen Access
    Power performance of a continuous-wave Cr2+:ZnSe laser at 2.4 7 ?m
    (Optica Publishing Group, 2000) Pollock, C.R.; Department of Physics; Sennaroğlu, Alphan; Konca, Ali Özgün; Faculty Member; Undergraduate Student; Department of Physics; College of Sciences; 23851; N/A
    Continuous-wave power performance of a Cr2+:znSe laser was investigated at 2.474 ?m. End pumped by a 1.583-?m NaCl:OH- laser, the resonator with a 3% transmitting output coupler produced as high as 250 mW of output power with a slope efficiency of 24.2%. Analysis of the laser efficiency data shows that the magnitude of the excited-state absorption cross section is less than 5% of the emission cross section in agreement with spectroscopic results. Numerical calculations further predict the optimum crystal length and absorption coefficient to be 2.5 cm and 0.49 cm-1, respectively, for continuous-wave operation.