Growth and characterization of KDP single crystals by Sankaranarayanan-Ramasamy (SR) method

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Tác giả: Thành Đạt Huỳnh, Thị Quỳnh Anh Lê, Trung Vĩnh Phan

Ngôn ngữ: vie

Ký hiệu phân loại: 548.5 Crystallization

Thông tin xuất bản: Tạp chí Phát triển Khoa học & Công nghệ, 2017

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ID: 492447

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Pure KDP single crystals were studied extensively since the 1930s because they could be grown easily to reach a large size, of their low cost and piezoelectric property. Since then, many applications of the KDP crystal have been developed such as the electro-optic modulation, the optical switch (Q-Switch) and the frequency of laser converter through the second-, third-order nonlinear effects. In response to these applications, the high-quality KDP single crystals are required. The common method of growing KDP crystal is the temperature lowering, in which a KDP seed is placed in a supersaturated solution. The disadvantage of this method is the spontaneous appearance of crystalline clusters at the bottom of the container which retard the growth of the main crystal. Since the 2010s, Sankaranarayanan and Ramasamy have proposed a new method of growing crystal by designing the Y-shaped solution container. In this study, the KDP single crystals were grown by the SR method. These crystals have better quality, fewer defects, higher hardness and density, and especially material saving compared to the ones prepared by the traditional methods.Tinh thể KDP (Potassium Dihydrogen Phosphate, KH2PO4) đã được quan tâm nghiên cứu từ những năm 1930 vì dễ dàng chế tạo với kích thước lớn, chi phí thấp và đặc biệt có tính áp điện. Từ đó đến nay, nhiều ứng dụng của tinh thể KDP đã được phát triển như dùng làm bộ biến điệu điện quang, khóa chuyển mạch quang học (Q-Switch) và bộ điều biến tần số laser thông qua các hiệu ứng phi tuyến bậc hai, bậc ba. Để đáp ứng các ứng dụng, đòi hỏi phải có những đơn tinh thể KDP chất lượng cao. Phương pháp chế tạo đơn tinh thể KDP phổ biến hiện nay là phương pháp hạ nhiệt độ, trong đó một mầm tinh thể KDP được đặt trong môi trường dung dịch quá bão hòa. Hạn chế của phương pháp này là sự xuất hiện không mong muốn của đám kết tinh dưới đáy bình nuôi, gây cản trở sự phát triển của đơn tinh thể chính. Từ những năm 2010, Sankaranarayanan và Ramasamy (SR) đã đề xuất một phương pháp chế tạo đơn tinh thể mới dựa trên việc thiết kế hình dáng bình đựng dung dịch có dạng chữ Y. Trong nghiên cứu này, đơn tinh thể KDP được chế tạo bằng phương pháp SR. Kết quả cho thấy phương pháp mới này cho đơn tinh thể KDP chất lượng tốt hơn, ít sai hỏng hơn, độ cứng, độ kết khối cao hơn và đặc biệt là tiết kiệm vật liệu hơn so với các phương pháp truyền thống.

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