Researcher:
Pekerten, Barış

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Undergraduate Student

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Barış

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Pekerten

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Pekerten, Barış

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1998 - 19995

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Researcher Of Publications: search.filters.isAuthorOfPublication.3aae3ff1-4f92-40be-83e7-3525b4caf2cb

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    Experimental and numerical investigation of thermal effects in end-pumped Cr/sup 4+/: forsterite lasers near room temperature
    (IEEE-Inst Electrical Electronics Engineers Inc, 1998) Department of Physics; Department of Physics; Sennaroğlu, Alphan; Pekerten, Barış; Faculty Member; Undergraduated Student; Department of Physics; College of Sciences; College of Sciences; 23851; N/A
    The results of a study which employs both experimental and theoretical methods to investigate the role of thermal effects in room-temperature Cr4+:forsterile lasers are presented. A novel model was developed to calculate the incident threshold pump power required to attain oscillation by taking into account absorption saturation and pump-induced thermal loading in the gain medium, Experimentally, the incident threshold pump power was measured as a function of the crystal boundary temperature for three Cr4+:forsterite laser crystals with different small-signal differential absorption coefficients alpha(p0) and/or cross-sectional areas. Excellent agreement was obtained between theory and experiment for values of the stimulated emission cross section comparable to those from previously reported data. The model was then used to numerically determine the optimum value of alpha(p0) which minimizes the incident threshold pump power in room-temperature Cr4+:forsterite lasers, At a crystal boundary temperature of 15 degrees C, the optimum value of alpha(p0) was determined to be 0.64 cm(-1) for a 2-cm-long Cr4+:forsterite crystal, corresponding to an unsaturated absorption of 72%. The use of crystals with an optimum absorption coefficient should lead to the realization of highly efficient CW Cr4+:forsterite lasers at room temperature.
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    Determination of the optimum absorption coefficient in Cr4+: forsterite lasers under thermal loading
    (Optical Soc Amer, 1998) Department of Physics; Department of Physics; Sennaroğlu, Alphan; Pekerten, Barış; Faculty Member; Undergraduated Student; Department of Physics; College of Sciences; College of Sciences; 23851; N/A
    We present the results of a novel experimental and numerical investigation aimed at minimizing thermal loading effects in room-temperature Cr4+:forsterite lasers. In the model we numerically calculated the incident primp power required for oscillation threshold to be attained by taking into account pump absorption saturation, pump-induced thermal gradients inside the crystal, and the temperature dependence of the upper-state fluorescence lifetime. Excellent agreement was obtained between model predictions and experimental threshold data. We then used the model to calculate the optimum absorption coefficient that minimizes the incident threshold pump power. At a crystal boundary temperature of 15 degrees C the optimum value of the absorption coefficient was numerically determined to be 0.64 cm(-1). Such optimization studies, which are readily applicable to other laser systems, should make a significant contribution to the improvement of the power performance of Cr4+:forsterite lasers at room temperature.
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    Determination of the optimum absorption coefficient in Cr4+: forsterite lasers under thermal loading: errata
    (Optical Soc Amer, 1999) Department of Physics; Department of Physics; Sennaroğlu, Alphan; Pekerten, Barış; Faculty Member; Undergraduated Student; Department of Physics; College of Sciences; College of Sciences; 23851; N/A
    In our recent Letter,[1] in which we analyzed the effects of thermal loading in room-temperature Cr4+:forsterite lasers, a scaling error was made in the best-fit and optimization calculations. In the comparison of theory with experiment (Fig. 2), the correct best-fit value of the stimulated-emission cross section 𝜎𝑒 should have been 0.98×10−19 cm2. In addition, the correct optimum value of the small-signal absorption coefficient that minimizes the incident threshold pump power (see Fig. 3) should have been 0.34 cm−1, corresponding to a net unsaturated pump absorption of 49% for a 2-cm-long crystal. The corrections did not affect any of the trends predicted by the theory.
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    Opt hum differential absorption coefficient for CR4+:forsterite lasers under thermal loading: an experimental and theoretical investigation
    (Optica Publishing Group, 1998) Department of Physics; Department of Physics; Sennaroğlu, Alphan; Pekerten, Barış; Faculty Member; Undergraduated Student; Department of Physics; College of Sciences; College of Sciences; 23851; N/A
    A novel numerical model, in excellent agreement with experimental data, predicts an optimum differential absorption coefficient of 0.64 cm-1 for Cr4+: forsterite lasers under thermal loading.
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    Experimental and numerical investigation of thermal effects in end-pumped cr4+: forsterite lasers near room temperature
    (Institute of Electrical and Electronics Engineers (IEEE), 1999) Department of Physics; N/A; Sennaroğlu, Alphan; Pekerten, Barış; Faculty Member; Undergraduate Student; Department of Physics; College of Sciences; College of Sciences; 23851; N/A