Optical gain due to the Eu transition in the alloy of Ca1-xEuxGa2S4 |
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Authors: | A Kato S Iida M Yamazaki C Hidaka |
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Institution: | a Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka 940-2188, Japan b Nagaoka National College of Technology, Nagaoka 940-8532, Japan c College of Humanities and Sciences, Nihon University, Tokyo 156-0045, Japan |
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Abstract: | Room temperature photoluminescence quantum efficiency of the alloy of Ca1−xEuxGa2S4 was measured as a function of x, and was found to be nearly unity under excitation at peak wavelength of excitation spectrum (510 nm) in the x range of 0.01≤x≤0.2. At larger x values, it tends to decrease, but still as high as 30% for stoichiometric compound EuGa2S4. Taking these backgrounds into account, pump-probe experiments were done with Ca1−xEuxGa2S4 for searching optical gain at x=0.2. The optical gain of nearly 30 cm−1 was confirmed to exist, though the pumping induced transient absorption which seems to limit the higher gain was found. |
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Keywords: | A Alloys A Optical materials D Luminescence D Optical properties |
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