Non-linear optical crystal calcium niobate

Abstract

The non-linear optical crystal calcium niobate as one new type of photoelectronic functional material has the molecular formula of Ca2Nb2O7 and abbreviation of CN. It may be used in doubling frequency of Nd:YAG laser. It is prepared through high temperature sintering to obtain compound for growing CN monocrystal, and subsequent Czochralski process to grow CN monocrystal in the conditions of growing temperature 1600 deg.c, pulling speed 0.5-2 mm / hr, rotation speed 5-20 rpm and nitrogen, argon or other inert gas atmosphere. CN may find its wide application in various non-linear optical fields.

Description

technical field

[0001] The invention relates to a novel optoelectronic functional material, in particular to a novel nonlinear optical material. Background technique

[0002] Among the many artificial crystals, niobate crystals occupy a very important position, almost all over the application fields of functional crystals. For example, lithium niobate single crystal is a high-quality piezoelectric, photoelectric, and ferroelectric crystal material with high electromechanical coupling coefficient and low acoustic propagation characteristics, and is widely used in the fields of laser, surface acoustic wave, holography, and optical storage technology. Potassium niobate is a nonlinear optical crystal with excellent performance discovered in the late 1960s. Its nonlinear optical quality factor and electro-optical quality factor rank among the best among oxide crystals. It has important application value in high-tech fields such as variable information processing. Barium stronti...

Examples

Embodiment 1

[0011] Example 1: About CB Synthesis

[0012] We use the solid state method to sinter at a high temperature of 1050°C, and the chemical reaction equation is as follows:

[0013]

[0014] The chemical reagents used and their manufacturers are as follows:

[0015] CaCO 3 Analytical purity 99% Shanghai Silian Chemical Factory

[0016] Nb 2 o 5 Analytical purity 99.99% China National Pharmaceutical Group Shanghai Chemical Reagent Company

[0017] The dosage of these two reagents is as follows:

[0018] CaCO 3 100.09 grams

[0019] Nb 2 o 5 132.905 grams

[0020] The specific steps are: weigh the reagents according to the above doses, put them into a mortar, mix them and grind them carefully, use a plexiglass mold of φ45×40mm to press them into tablets of φ45×30mm on a tablet machine, and then put the tablets into φ60 ×60mm iridium crucible, put it into a muffle furnace and heat up to 1050°C for 10 hours, keep the temperature for 10 hours, then cool ...

Embodiment 2

[0021] Example 2: About CN single crystal growth

[0022] The pull method is adopted, the medium frequency induction heating furnace is used, and the temperature is controlled by Yuguang 708P temperature controller. The specific operation steps are: put the iridium gold crucible containing the raw materials in the pulling furnace, raise the temperature to 1600°C to melt the raw materials, keep the temperature for about half an hour, first use the iridium gold wire as the seed crystal for pulling growth, and use the obtained The crystal is cut into a seed crystal, and the second growth is carried out to obtain a single crystal with relatively good quality. The conditions for growing the crystal are that the pulling speed is 1 mm / hour, the rotation speed is 10 revolutions / minute, and the growth atmosphere is a nitrogen atmosphere. By using this method, a CN single crystal of φ25×30mm can be obtained.

technical field

[0001] The invention relates to a novel optoelectronic functional material, in particular to a novel nonlinear optical material. Background technique

[0002] Among the many artificial crystals, niobate crystals occupy a very important position, almost all over the application fields of functional crystals. For example, lithium niobate single crystal is a high-quality piezoelectric, photoelectric, and ferroelectric crystal material with high electromechanical coupling coefficient and low acoustic propagation characteristics, and is widely used in the fields of laser, surface acoustic wave, holography, and optical storage technology. Potassium niobate is a nonlinear optical crystal with excellent performance discovered in the late 1960s. Its nonlinear optical quality factor and electro-optical quality factor rank among the best among oxide crystals. It has important application value in high-tech fields such as variable information processing. Barium stronti...

Examples

Embodiment 1

[0011] Example 1: About CB Synthesis

[0012] We use the solid state method to sinter at a high temperature of 1050°C, and the chemical reaction equation is as follows:

[0013]

[0014] The chemical reagents used and their manufacturers are as follows:

[0015] CaCO 3 Analytical purity 99% Shanghai Silian Chemical Factory

[0016] Nb 2 o 5 Analytical purity 99.99% China National Pharmaceutical Group Shanghai Chemical Reagent Company

[0017] The dosage of these two reagents is as follows:

[0018] CaCO 3 100.09 grams

[0019] Nb 2 o 5 132.905 grams

[0020] The specific steps are: weigh the reagents according to the above doses, put them into a mortar, mix them and grind them carefully, use a plexiglass mold of φ45×40mm to press them into tablets of φ45×30mm on a tablet machine, and then put the tablets into φ60 ×60mm iridium crucible, put it into a muffle furnace and heat up to 1050°C for 10 hours, keep the temperature for 10 hours, then cool ...

Embodiment 2

[0021] Example 2: About CN single crystal growth

[0022] The pull method is adopted, the medium frequency induction heating furnace is used, and the temperature is controlled by Yuguang 708P temperature controller. The specific operation steps are: put the iridium gold crucible containing the raw materials in the pulling furnace, raise the temperature to 1600°C to melt the raw materials, keep the temperature for about half an hour, first use the iridium gold wire as the seed crystal for pulling growth, and use the obtained The crystal is cut into a seed crystal, and the second growth is carried out to obtain a single crystal with relatively good quality. The conditions for growing the crystal are that the pulling speed is 1 mm / hour, the rotation speed is 10 revolutions / minute, and the growth atmosphere is a nitrogen atmosphere. By using this method, a CN single crystal of φ25×30mm can be obtained.