Nonlinear optical crystal lanthanum calcium vanadate and preparation method and application thereof

Abstract

The invention provides a non-linear optical crystal lanthanum calcium vanadate, a preparation method and an application thereof. The chemical formula of the crystal is Ca9La(VO4)7, belonging to the R3cH space group, trigonal system; and a Czochralski method is adopted to grow single crystal with an inert gas atmosphere as the growth atmosphere. The lanthanum calcium vanadate crystal has functions of obtaining various optical parts through positioning, cutting, rough grinding, polishing and plating according to processing requirements. The preparation method has the advantages of scientificalness and reasonability, strong operability, simple process, short period, large-scale low-cost mass production capability, large dimension of prepared crystal lanthanum calcium vanadate, good optical homogeneity, excellent physiochemical property, large nonlinear optical coefficient and availability for visible light area and near infrared light area, and can be widely applied to various nonlinear optical neighborhoods with prominent economic benefit and social benefit.

Description

technical field

[0001] The invention belongs to the field of artificial crystals and crystal growth in the technical field of optoelectronic functional materials, and more specifically relates to a nonlinear optical crystal calcium lanthanum vanadate and its preparation method and application. Background technique

[0002] In the field of laser technology, scientists have always pursued the goal of obtaining a laser light source that can be continuously adjusted from the infrared region to the ultraviolet region. This is because although the current laser host materials have been able to produce tunable coherent light source output within a certain range, because their tunable wavelength range is determined by the gain bandwidth of the activated ions in the laser medium, their tunable range and Efficiency is considerably limited. At present, the Ti:Sapphire laser with the largest tunable range has a maximum tunable range between 670 and 1100 nm, which is far from meeting th...

Examples

Embodiment 1

[0023] Growth of Ca by pulling method 9 La(VO 4 ) 7 laser crystals.

[0024] Will be in stoichiometric ratio: La 2 o 3 : CaCO 3 : NH 4 VO 3 The molar ratio is 1:18:14, accurately weigh La 2 o 3 (99.99%), CaCO 3 (99.5%), NH 4 VO 3 (99.5%) raw materials, put the raw materials into a corundum mortar, mix and grind them evenly, after tableting, place them in a muffle furnace for high-temperature sintering, the temperature of the high-temperature sintering is 800-1000°C, and the sintering time is 4-1000°C. After 10 hours, high-purity polycrystalline raw materials were prepared.

[0025] Put the synthesized polycrystalline powder raw materials into the single crystal pulling furnace, and use a size of about φ60×40mm 3 The iridium crucible is used as a container for crystal growth, in N 2 The single crystal is pulled under the atmosphere, the growth rate is about 1.5-2.0mm / h, and the crystal rotation speed is about 12-25r / min. During the growth process, observe the cha...

Embodiment 2

[0029] Growth of Ca by pulling method 9 La(VO 4 ) 7 laser crystals.

[0030] Will be in stoichiometric ratio: La 2 o 3 : CaCO 3 : NH 4 VO 3 The molar ratio is 1:18:14, accurately weigh La 2 o 3 (99.99%), CaCO 3 (99.5%), NH 4 VO 3(99.5%) raw materials, put the raw materials into a corundum mortar, mix and grind evenly, after pressing into tablets, place them in a muffle furnace for high-temperature sintering, the high-temperature sintering temperature is 800-1000°C, and the sintering time is 4-10 hours , the synthesis of Ca 9 La(VO 4 ) 7 Polycrystalline powder raw material.

[0031] Put the synthesized polycrystalline powder raw material into the single crystal pulling furnace, and use a size of about φ65×35mm 3 The iridium crucible was used as a container for crystal growth, and the single crystal was pulled under an Ar atmosphere with a growth rate of 2.0mm / h and a crystal rotation speed of 25r / min. During the growth process, observe the changes of the apertu...

technical field

[0001] The invention belongs to the field of artificial crystals and crystal growth in the technical field of optoelectronic functional materials, and more specifically relates to a nonlinear optical crystal calcium lanthanum vanadate and its preparation method and application. Background technique

[0002] In the field of laser technology, scientists have always pursued the goal of obtaining a laser light source that can be continuously adjusted from the infrared region to the ultraviolet region. This is because although the current laser host materials have been able to produce tunable coherent light source output within a certain range, because their tunable wavelength range is determined by the gain bandwidth of the activated ions in the laser medium, their tunable range and Efficiency is considerably limited. At present, the Ti:Sapphire laser with the largest tunable range has a maximum tunable range between 670 and 1100 nm, which is far from meeting th...

Examples

Embodiment 1

[0023] Growth of Ca by pulling method 9 La(VO 4 ) 7 laser crystals.

[0024] Will be in stoichiometric ratio: La 2 o 3 : CaCO 3 : NH 4 VO 3 The molar ratio is 1:18:14, accurately weigh La 2 o 3 (99.99%), CaCO 3 (99.5%), NH 4 VO 3 (99.5%) raw materials, put the raw materials into a corundum mortar, mix and grind them evenly, after tableting, place them in a muffle furnace for high-temperature sintering, the temperature of the high-temperature sintering is 800-1000°C, and the sintering time is 4-1000°C. After 10 hours, high-purity polycrystalline raw materials were prepared.

[0025] Put the synthesized polycrystalline powder raw materials into the single crystal pulling furnace, and use a size of about φ60×40mm 3 The iridium crucible is used as a container for crystal growth, in N 2 The single crystal is pulled under the atmosphere, the growth rate is about 1.5-2.0mm / h, and the crystal rotation speed is about 12-25r / min. During the growth process, observe the cha...

Embodiment 2

[0029] Growth of Ca by pulling method 9 La(VO 4 ) 7 laser crystals.

[0030] Will be in stoichiometric ratio: La 2 o 3 : CaCO 3 : NH 4 VO 3 The molar ratio is 1:18:14, accurately weigh La 2 o 3 (99.99%), CaCO 3 (99.5%), NH 4 VO 3(99.5%) raw materials, put the raw materials into a corundum mortar, mix and grind evenly, after pressing into tablets, place them in a muffle furnace for high-temperature sintering, the high-temperature sintering temperature is 800-1000°C, and the sintering time is 4-10 hours , the synthesis of Ca 9 La(VO 4 ) 7 Polycrystalline powder raw material.

[0031] Put the synthesized polycrystalline powder raw material into the single crystal pulling furnace, and use a size of about φ65×35mm 3 The iridium crucible was used as a container for crystal growth, and the single crystal was pulled under an Ar atmosphere with a growth rate of 2.0mm / h and a crystal rotation speed of 25r / min. During the growth process, observe the changes of the apertu...