Large size hydrate potassium borate nonlinear optical crystal, preparation and use thereof

Abstract

The invention relates to a large size hydrate potassium borate nonlinear optical crystal, the preparation and use thereof. The formula of the crystal is: K3B3O6.4H2O, which belongs to rhombic system, the space group is Pna2(1), and the molecular weight is 317.79. The preparation contains the following steps of: based on an aqua-solution method, slowly volatiling the water content for 3-60 days to obtain the crystal, selecting the crystal with better quality as seed crystal, lowering temperature proceedingly or maintaining the constant temperature so as to obtain the large size hydrate potassium borate nonlinear centimetre-sized optical crystal. The nonlinear optical effect of the crystal is 0.5 times than that of the KDP crystal, the transparent optical band is 190nm-2650nm. The growth process of the crystal is simple in operation and low in cost. The reagents used in the preparation are all inorganic materials, and have advantages of low toxicity, short growth period, stable physicochemical properties. Accordingly, the nonlinear optical crystal of the invention can be abroadly applied in nonlinear optical devices such as frequency doubler, optical parametric oscillator or the like.

Description

technical field [0001] The invention relates to an inorganic nonlinear optical crystal, which belongs to the field of inorganic chemistry, and also belongs to the field of material science and optics. Background technique [0002] Nonlinear optical effects originate from the interaction between laser and medium. When the laser propagates in a medium with non-zero second-order polarizability, nonlinear optical effects such as frequency doubling, sum frequency, difference frequency, and optical parametric amplification will occur. Using the second-order nonlinear optical effect of crystals, nonlinear optical devices such as second-harmonic generators, frequency converters, and optical parametric oscillators can be made. They are widely used in many fields, such as laser technology, atmospheric monitoring, and national defense. It has important application value. After decades of exploration and research, nonlinear optical crystal materials have achieved fruitful results, esp...

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Problems solved by technology

Although the crystal growth technology of these materials has become increasingly mature, there are still obvious shortcomings: such as crystal deliquescence, long growth cycle, serious layered growth habit and expensive price, etc.

[0006] In 1966, although K 3 B 3 o 6 4H 2 O compounds have been reported for a long time, but these reports have not yet involved the testing and research of the linear and nonlinear properties of crystals and their applications in nonlinear optics.

To test the basic physical properties (including nonlinear optical properties) of a crystal, the crystal needs to be a single crystal with a size of several millimeters or even centimeters. So far, there has been no relevant preparation of K crystals with a size sufficient for physical property testing. 3 B 3 o 6 4H 2 There is no report on O single crystal, and the crystal cannot be purchased in the market, and there is no information about K 3 B 3 o 6 4H 2 O The report of the test results of the nonlinear optical properties of the single crystal or the K 3 B 3 o 6 4H 2 O single crystal used in the report of fabricating nonlinear optical devices

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