A method for growing near-stoichiometric lithium niobate crystals using a temperature field device with adjustable temperature gradient
A near-stoichiometric, temperature gradient technology, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems of unable to achieve variable temperature gradient, unable to adjust the temperature field, unable to change the temperature field and other problems , to achieve the effect of realizing computer automatic program control management, simple structure and avoiding errors
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Embodiment 1
[0023] The variable temperature gradient temperature field device of the present invention
[0024] Select the existing temperature field device. The internal structure of the crystal pulling furnace includes a fixed motion device, a temperature field system with a heat preservation bucket, a heating device and a platinum crucible. Stone insulation bricks, alumina insulation cotton and corundum crucible in the center of the insulation bucket, the insulation bucket is placed in the center of the ring-shaped induction coil with 10-12 turns, and the induction coil uses the form of eddy current for the platinum crucible. The polycrystalline material that grows nearly stoichiometric lithium niobate crystals is heated; a corundum cone cover and a heat preservation cover are placed in sequence directly above the heat preservation barrel from bottom to top. The variable temperature gradient temperature field device of the present invention is based on the existing temperature field de...
Embodiment 2
[0027] The diameter of the movable insulation cap is 50% of that of the fixed temperature field system to grow near-stoichiometric lithium niobate crystals
[0028] (1) The quality of the pulled crystal prepared according to the setting is 550g, weigh 3000g of spherical polycrystalline material with a mass particle size of 300-400nm for growing near-stoichiometric lithium niobate crystals, and then fill it into a platinum crucible After binding the seed crystal and adjusting the vertical distance between the bottom of the seed crystal and the upper edge of the platinum crucible to be 15cm, turn on the intermediate frequency heating power supply, and heat up the material to obtain a lithium niobate melt;
[0029] (2) In the early stage of crystal growth, raise the movable heat preservation cap in the temperature field device by 12cm, and after the temperature stabilizes for 1 hour, lower the bound seed crystal to contact with the liquid surface of lithium niobate melt, and obser...
Embodiment 3
[0033] The diameter of the movable insulation cap is 60% of that of the fixed temperature field system to grow near-stoichiometric lithium niobate crystals
[0034] (1) The quality of the pulled crystal prepared according to the setting is 550g, weigh 3000g of spherical polycrystalline material with a mass particle size of 300-400nm for growing near-stoichiometric lithium niobate crystals, and then fill it into a platinum crucible After binding the seed crystal and adjusting the vertical distance between the bottom of the seed crystal and the upper edge of the platinum crucible to be 15cm, turn on the intermediate frequency heating power supply, and heat up the material to obtain a lithium niobate melt;
[0035] (2) In the early stage of crystal growth, raise the movable heat preservation cap in the temperature field device by 12cm, and after the temperature stabilizes for 1 hour, lower the bound seed crystal to contact with the liquid surface of lithium niobate melt, and obser...
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