Far-infrared laser oscillation in p-Ge |
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| Institution: | 1. Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA;2. Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA;3. Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180, USA;1. Department of Physics, Yonsei University, Seoul 03722, Republic of Korea;2. Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Republic of Korea;1. Department of Materials Science and Engineering & Center for 2D and Layered Materials, The Pennsylvania State University, University Park, PA 16802, USA;2. The Pennsylvania State University, Department of Physics & Center for 2D and Layered Materials, University Park, PA 16802, USA;3. The Pennsylvania State University Department of Chemistry & Center for 2D and Layered Materials, University Park, PA 16802, USA;4. Department of Materials Science & Nanoengineering, Rice University, Houston, TX 77005, USA;5. Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Wakasato 4-17-1, Nagano-city 380-8553, Japan;1. Dipartimento di Fisica, Università degli Studi della Calabria, 87036 Rende (Cs), Italy;2. Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Via della Vasca Navale, 84-00146 Roma, Italy |
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| Abstract: | Time-resolved measurements, together with spectroscopic study with a grating monochromator, are made on far-infrared stimulated emission from p-Ge in crossed electric and magnetic fields. Gain saturation is confirmed, for the first time, to occur to establish laser oscillation. Small-signal gain per unit length deduced from the time constant of light amplification is 7.4 × 10-3 cm-1 and 2.7 × 10-2 cm-2, respectively, for samples with NA − ND ≅ 4.5 × 1013cm−3 and 1.7 × 1014 cm-3. Output power detected at distance 28 cm from the sample is of order 1–10 W, but higher power over 100W is suggested for the total output from the sample. |
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