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      Nonlinear optical properties of arsenic telluride and its use in ultrafast fiber lasers

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          Abstract

          We report the first investigation results of the nonlinear optical properties of As 2Te 3. More specifically, the nonlinear optical absorption properties of the prepared α-As 2Te 3 were investigated at wavelengths of 1.56 and 1.9 μm using the open-aperture (OA) Z-scan technique. Using the OA Z-scan technique, the nonlinear absorption coefficients (β) of α-As 2Te 3 were estimated in a range from (− 54.8 ± 3.4) × 10 4 cm/GW to (− 4.9 ± 0.4) × 10 4 cm/GW depending on the irradiance of the input beam at 1.56 μm, whereas the values did from (− 19.8 ± 0.8) × 10 4 cm/GW to (− 3.2 ± 0.1) × 10 4 cm/GW at 1.9 μm. In particular, the β value at 1.56 μm is an order of magnitude larger than the previously reported values of other group-15 sesquichalcogenides such as Bi 2Se 3, Bi 2Te 3, and Bi 2TeSe 2. Furthermore, this is the first time report on β value of a group-15 sesquichalcogenide at a 1.9-μm wavelength. The density functional theory (DFT) calculations of the electronic band structures of α-As 2Te 3 were also conducted to obtain a better understanding of their energy band structure. The DFT calculations indicated that α-As 2Te 3 possess sufficient optical absorption in a wide wavelength region, including 1.5 μm, 1.9 μm, and beyond (up to 3.7 μm). Using both the measured nonlinear absorption coefficients and the theoretically obtained refractive indices from the DFT calculations, the imaginary parts of the third-order optical susceptibilities (Im χ (3)) of As 2Te 3 were estimated and they were found to vary from (− 39 ± 2.4) × 10 –19 m 2/V 2 to (− 3.5 ± 0.3) × 10 –19 m 2/V 2 at 1.56 μm and (− 16.5 ± 0.7) × 10 –19 m 2/V 2 to (− 2.7 ± 0.1) × 10 –19 m 2/V 2 at 1.9 μm, respectively, depending on the irradiance of the input beam. Finally, the feasibility of using α-As 2Te 3 for SAs was investigated, and the prepared SAs were thus tested by incorporating them into an erbium (Er)-doped fiber cavity and a thulium–holmium (Tm–Ho) co-doped fiber cavity for both 1.5 and 1.9 μm operation.

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          Generalized Gradient Approximation Made Simple

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            Sensitive measurement of optical nonlinearities using a single beam

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              Semiconductor saturable absorber mirrors (SESAM's) for femtosecond to nanosecond pulse generation in solid-state lasers

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                Author and article information

                Contributors
                j.h.lee@ieee.org
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                17 September 2020
                17 September 2020
                2020
                : 10
                Affiliations
                [1 ]GRID grid.267134.5, ISNI 0000 0000 8597 6969, School of Electrical and Computer Engineering, , University of Seoul, ; Seoul, 02504 South Korea
                [2 ]GRID grid.35541.36, ISNI 0000000121053345, Sensor System Research Center, , Korea Institute of Science and Technology, ; Seoul, 02792 South Korea
                Article
                72265
                10.1038/s41598-020-72265-3
                7498598
                7effa080-93b8-42ee-93f0-86d6b5812ff4
                © The Author(s) 2020

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100003725, National Research Foundation of Korea;
                Award ID: 2018R1A2B6001641
                Categories
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                Custom metadata
                © The Author(s) 2020

                Uncategorized
                nonlinear optics,nanoparticles,fibre lasers,mode-locked lasers
                Uncategorized
                nonlinear optics, nanoparticles, fibre lasers, mode-locked lasers

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