Nonlinear optical crystal strontium calcium pyroniobate and preparation method thereof

Abstract

A nonlinear optical crystal calcium strontium pyroniobate [CaSrNb 2 o 7 ] and a preparation method thereof relate to the field of artificial crystals. The crystal belongs to the orthorhombic crystal system, and the space group is Cmc2 1 , melting with the same composition, the melting point is 1450-1500°C, and the crystals with high optical quality and large size can be grown by the pulling method, and its second-order nonlinear optical coefficient is equivalent to 3-4 times KDP, which can realize visible and near-mid-infrared bands Phase matching. Physical performance tests show that the crystal has high transmittance in the visible and near-middle infrared bands, and has good various physical, chemical, thermal and mechanical properties. The crystal is a new nonlinear optical crystal suitable for visible and near-mid-infrared bands, and is expected to be practically applied.

Description

technical field [0001] The invention belongs to the technical field of optoelectronic functional materials, in particular to nonlinear optical crystal materials used in lasers. Background technique [0002] Nonlinear optical crystals refer to crystals with nonlinear optical effects. Nonlinear optical effects refer to effects such as frequency doubling, difference frequency, sum frequency and parametric amplification. Nonlinear optical crystal materials are widely used in laser technology. It is mainly used to convert the laser frequency and expand the tunable frequency range of the laser, so that the laser can be used more widely. At present, frequency doubling, difference frequency, sum frequency and other technologies are widely used. It usually uses a special nonlinear optical crystal placed in front of the laser beam to change the output wavelength of the laser beam. [0003] Through decades of hard work by scientists from various countries, many nonlinear optical crys...

AI Technical Summary

Problems solved by technology

[0003] Through decades of hard work by scientists from various countries, many nonlinear optical crystals have been discovered, some of which have been practically applied, such as: KDP (KH 2 PO 4 ), KTP (KTiOPO 4 ), LBO (LiB 3 o 5 ), BBO (β-BaB 2 o 4 ), LiNbO 3 However, due to various reasons, nonlinear optical crystals applicable to all wavelength bands have not yet been obtained, so finding excellent nonlinear optical crystal materials is still one of the difficulties and frontiers in the field of crystal materials