Cesium-lead-carbon-oxygen-iodine birefringent crystal as well as preparation method and use thereof

Abstract

The invention relates to a cesium-lead-carbon-oxygen-iodine birefringent crystal for infrared-ultraviolet bands, as well as a preparation method and use. The chemical formula of the crystal is Cs3Pb2 (CO3)3I, the molecular weight of the crystal is 1120.04, the crystal belongs to a monoclinic system, a space group is C<2> / m, and unit cell parameters are a=24.549(3) Angstrom, b=5.4233(8) Angstrom, c=12.8598(16) Angstrom, beta=114.533(8) degrees,V=1557.5(4) Angstrom<3>, and Z=4. The cesium-lead-carbon-oxygen-iodine birefringent crystal is a positive biaxial crystal, (nz-ny) is greater than (ny-nx), a transmission range is 300-3000nm, birefringence is between 0.084(3000nm) and 0.374(340nm), and the crystal grows by a hydrothermal method. The obtained crystal disclosed by the invention is easy to grow, cut, grind, polish and preserve, stable in the air, and not liable to deliquate, can be used for manufacturing polarization beam splitters of Glen prisms, Wollaston prisms, Rochon prisms, or beam splitting polarizers and the like, and has an important application in the fields of photics and communications.

Description

Technical field [0001] The invention relates to a cesium-lead-carbon-oxygen-iodine birefringent crystal and a preparation method and application thereof, in particular to a molecular formula that can be used in the infrared-deep ultraviolet band as Cs 3 Pb 2 (CO 3 ) 3 I cesium lead carbon oxygen iodine birefringent crystal and its preparation and use. Background technique [0002] Crystals with birefringence are called birefringent crystals. As a kind of optical crystal, birefringent crystal plays an important role in people's life and industrial applications. Through birefringent crystals, linearly polarized light can be obtained, and the displacement of the beam can be realized. Thus, optical isolators, circulators, beam displacements, optical deception devices and optical modulators can be made. [0003] What is birefringence? It is one of the important characteristics of light when it propagates in a non-uniform dielectric crystal, which can be explained by the transverse wav...

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Problems solved by technology

However, these birefringent materials have disadvantages: α-BaB 2 o 4 Due to the presence of solid-state phase transitions, it is easy to crack during crystal growth; MgF 2 The transmission range of the crystal is 110-8500nm, it is a good material for deep ultraviolet, but its birefringence is too small, it is not suitable for making Glan prism, it can only be used for Rochon prism, and The separation angle of light speed is small, the device size is large, and it is inconvenient to use; LiNbO 3 Crystals are easy to get large-sized crystals, but the birefringence is too small; YVO 4 It is an artificial birefringent crystal with good performance, but its transmission range is 400-5000nm, it cannot be used in the ultraviolet region, and because YVO 4 The melting point is high, and an iridium crucible must be used for pulling growth, and the growth atmosphere is a weak oxygen atmosphere, so there is a problem of price change of iridium element during growth, which reduces the quality of the crystal and makes it difficult to obtain high-quality crystals; mainly in natural form The existing calcite crystals are difficult to synthesize artificially, and the general size is relatively small, and the impurity content is relatively high, which cannot meet the requirements of large-scale optical polarizing elements, and is easy to dissociate, difficult to process, and low in crystal utilization; rutile is also mainly natural Existing in form, artificial synthesis is more difficult, and the size is small, the hardness is high, and it is difficult to process

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