First-Principles Evaluation of the Alkali and/or Alkaline Earth Beryllium Borates in Deep Ultraviolet Nonlinear Optical Applications

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• 作者：Xingxing Jiang ; Siyang Luo ; Lei Kang ; Pifu Gong ; Hongwei Huang ; Shichao Wang ; Zheshuai Lin ; Chuangtian Chen
• 刊名：ACS Photonics
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：2
• 期：8
• 页码：1183-1191
• 全文大小：637K
• ISSN：2330-4022

文摘

The prospects of all known noncentrosymmetric alkali and/or alkaline earth beryllium borates for nonlinear optical (NLO) generation in the deep-ultraviolet (DUV) spectral region are evaluated by first-principles studies. It is shown that all these crystals possess large enough energy band gaps and relatively strong NLO responses that satisfy the requirement for DUV second-harmonic generation (SHG). However, the practical DUV SHG capabilities of these crystals are mostly limited by the phase-matching condition, as determined not only by the optical birefringence but also by the refractive-index dispersion that is explicitly emphasized for the first time in this work. Therefore, although the K₂Be₂BO₃F family and NaBeB₃O₆ both have a large birefringence, 螖n 鈮?0.08, at a wavelength of 400 nm, the DUV SHG lasers can only be produced in the former but cannot be fulfilled in the latter due to its large refractive-index dispersion in the DUV region. The crystal structural features for large birefringence and the electronic structure origins for different refractive-index dispersion behaviors are discussed. The elucidation of the structure鈥損roperty relationship presents a useful guide to the exploration of new NLO crystals that can be practically applied for DUV SHG.