Lithium aluminum silicate NOL (non-linear optics) crystal, and preparation method and application thereof

Abstract

The invention relates to a lithium aluminum silicate NOL (non-linear optics) crystal, and a preparation method and application thereof. With respect to the crystal, the molecular formula is Li3AlSiO5; the molecular weight is 155.89; the crystal belongs to an orthorhombic system; the space group is Pna21 (No.33); the cell parameters are that a is equal to 5.331 (3) angstroms; b is equal to 15.551 (9) angstroms; c is equal to 4.782 (3) angstroms; Z is equal to 4; and V is equal to 396.4 (4) angstroms 3. With respect to the powder of the crystal, the frequency-doubled effect is about 0.8 time that of KDP (HK2PO4); the powder has a wide optical transparency wave band; and the optical transparency wave band ranges from 175nm to 6,000nm. A cosolvent method is adopted to grow the crystal; the crystal is simple in preparation method and low in cost; the prepared crystal is moderate in mechanical hardness, and is easy to cut, polish and preserve. The lithium aluminum silicate NOL crystal obtained by the method described in the invention can be used for preparing a frequency-doubled generator, an upper frequency converter, a lower frequency converter or an optical parameter oscillator of an NOL device; and the application wave band can cover a wide area from deep ultraviolet to near-infrared. Therefore, the lithium aluminum silicate NOL crystal is an NOL crystal having an application value.

Description

technical field [0001] The present invention relates to a kind of lithium aluminosilicate (chemical formula is Li 3 AlSiO 5 ) nonlinear optical crystal, crystal preparation method and nonlinear optical device made by using the crystal. Background technique [0002] Laser is another major invention of mankind since the 20th century, following atomic energy, computers, and semiconductors. It is called "the fastest knife", "the most accurate ruler" and "the brightest light". It has extremely important significance for industrial processing, information storage, and national defense modernization. With the widening range of laser applications, the demand for lasers of different frequencies and intensities is becoming increasingly urgent. The laser wave bands that can be obtained directly by using laser crystals are limited, and there are still blank wave bands from deep ultraviolet to infrared spectral regions. Generally speaking, a laser tends to output laser light of a spe...

AI Technical Summary

Problems solved by technology

Although the growth technology of these crystals has become increasingly mature, there are still obvious deficiencies: such as crystals are prone to deliquescence, long growth cycle, serious layered growth habit and high toxicity of raw materials, etc.

[0004] Therefore, in recent years, the research on deep ultraviolet nonlinear optical crystals has mainly focused on the field of borates. However, the nonlinear optical crystals of silicates have rarely been mentioned. The frequency effect is generally very small. On the other hand, silicate crystals that have been reported to have frequency doubling effects such as Ca 3 SiO 5 Phase matching cannot be achieved and thus cannot be directly applied

At the same time, aluminosilicates have not been reported as nonlinear optical crystals.

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