(NH4)3B11PO19F3: a deep-UV nonlinear optical crystal with unique [B5PO10F]∞ layers |
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Authors: | Bingliang Cheng Zijian Li Yu Chu Abudukadi Tudi Miriding Mutailipu Fangfang Zhang Zhihua Yang Shilie Pan |
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Institution: | CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics and Chemistry of Chinese Academy of Sciences, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Urumqi 830011, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | Deep-ultraviolet (DUV) nonlinear optical (NLO) crystals that can extend the output range of coherent light below 200 nm are pivotal materials for solid-state lasers. To date, KBe2BO3F2 (KBBF) is the only usable crystal that can generate DUV coherent light by direct second harmonic generation (SHG), but the layered growth habit and toxic ingredients limit its application. Herein, we report a new fluoroborophosphate, (NH4)3B11PO19F3 (ABPF), containing four different functional units: BO3], BO4], BO3F] and PO4]. ABPF exhibits a KBBF-like structure while eliminating the limitations of KBBF crystal. The unique B5PO10F]∞ layers enhance ABPF’s performance; for example, it has a large SHG response (1.2 × KDP) and a sufficient birefringence (0.088 at 1064 nm) that enables the shortest phase-matching wavelength to reach the DUV region. Meanwhile, the introduction of strong B-O-P covalent bonds decreases the layered growth habit. These findings will enrich the structural chemistry of fluoroborophosphate and contribute to the discovery of more excellent DUV NLO crystals. |
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Keywords: | deep-ultraviolet nonlinear optical materials KBBF-like structure fluoroborophosphate |
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