Holmium-doped gadolinium-yttrium-barium fluoride crystal and growth method thereof

Abstract

The invention relates to a holmium-doped gadolinium-yttrium-barium fluoride crystal and a growth method thereof, belonging to the technical field of optoelectronic materials. The conventional Ho:BaY2F8 crystal has low doping concentration, small size and bad crystal morphology. The holmium-doped gadolinium-yttrium-barium fluoride crystal belongs to a monoclinic system, rare earth element holmium is used as active ions, a crystal matrix is gadolinium-yttrium-barium fluoride, and the molecular formula of the holmium-doped gadolinium-yttrium-barium fluoride crystal is Ho:BaYGdF8. The growth method for the holmium-doped gadolinium-yttrium-barium fluoride crystal comprises the following three steps of: preparing a growth material, performing crystal growth and annealing. In the step of preparing the growth material, elements such as F, Gd, Y and Ba served as raw materials are provided in a molar ratio of BaF2: GdF3: YF3 equal to 1:1:1, HoF3 is determined as x mol, GdF3 is determined as (1-x) mol, BaF2 is determined as 1 mol, and the value scope of the x is more than or equal to 0.005 mol and less than or equal to 1 mol; and in the step of performing the crystal growth, process parameters for the crystal growth are determined as follows: the withdrawal pulling rate is between 0.3 and 0.8mm / h, the rotation speed is between 3 and 10rmp, and the growth temperature is between 880 and 903 DEG C.

Description

technical field [0001] The invention relates to a holmium-doped gadolinium yttrium barium fluoride crystal and a growth method thereof. The holmium doped gadolinium yttrium barium fluoride crystal is a laser crystal with a simplified formula of Ho:BaYGdF 8 , belongs to the technical field of optoelectronic materials. Background technique [0002] Holmium-doped laser has the characteristics of good atmospheric transmission characteristics, strong smoke penetration ability, and good confidentiality. It is used in laser ranging, lidar, photoelectric interference, remote sensing, environmental monitoring, optical communication and other fields. In addition, holmium-doped laser has strong absorption in water, so it is not only safe for human eyes, but also can accurately intervene in biological tissues, so it can be applied to ophthalmic surgery and so on. [0003] The laser materials used in holmium-doped lasers are holmium-doped laser crystals, including fluoride crystals, suc...

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Problems solved by technology

[0011] The Ho:BaY 2 f 8 The disadvantage of the crystal growth method is that when growing Ho:BaY 2 f 8 During the crystallization process, due to the BaY 2 f 8 The melting point is high, such as 980°C. In addition, the melt viscosity is high. These reasons make it difficult to grow large-sized Ho:BaY 2 f 8 crystals, as described by Ho:BaY 2 f 8 The crystal size obtained by the crystal growth method is only Φ20mm×25mm, which is difficult to fully meet the requirements for holmium-doped lasers in fields such as laser ranging, laser radar, photoelectric interference, remote sensing, environmental monitoring, and optical communication.

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