Method for heating yttrium lithium fluoride crystal at high frequency

A technology of yttrium lithium fluoride and high-frequency heating, applied in the field of high-frequency heating method, can solve the problems of raw material waste, serious volatilization of raw material lithium fluoride, and large deviation of raw material components.

Inactive Publication Date: 2020-01-17
安徽环巢光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Its disadvantages are as follows: the existing flowing atmosphere protection and induction heating method, the growth temperature field fluctuates greatly, and the raw material lithium fluoride volatilizes seriously, the remaining raw material components in the crucible deviate greatly, and cannot be reused, resulting in a large waste of raw materials
But still can't achieve a clean growth environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0031] Implementation case 1: 1. Select high-purity graphite to make a sintering mold (crucible) 2. Determine the weight of yttrium fluoride raw material, put it in a polytetrafluoro mold groove and press it statically to form a curved sheet. 3. Use a resistance single crystal pulling furnace to draw a high vacuum. Furnace installation: first clean the furnace, adjust the heating graphite resistance plate, add high temperature resistant inorganic salt high temperature resistant crystal slats (YAG crystal), the crystal has good insulation and thermal conductivity. Put the graphite tray on the crystal slats, adjust the center position, put the graphite crucible filled with raw materials, install the graphite resistor, make a transverse gradient molybdenum skin insulation, and add a multi-layer molybdenum skin cover. Check the observation port to directly see the raw materials in the crucible mouth, so as to observe the melting state of the raw materials. Check the gap between t...

Embodiment example 2

[0033] Implementation case 2: redesign the mold (crucible), the four sides of the upper mouth are 50 wires larger than the four sides of the lower mouth, forming an inverted character, and a graphite material guide barrel is added to the upper mouth to protect the raw materials from entering the crucible.

[0034]Furnace installation: first clean the furnace, adjust the heating graphite resistance plate, add high temperature resistant inorganic salt high temperature resistant crystal slats (YAG crystal), the crystal has good insulation and thermal conductivity. Put the graphite tray on the crystal slats, adjust the center position, put the graphite crucible filled with raw materials, install the graphite resistor, make a transverse gradient molybdenum skin insulation, and add a multi-layer molybdenum skin cover. Check the observation port to directly see the raw materials in the crucible mouth, so as to observe the melting state of the raw materials. Check the gap between the ...

Embodiment example 3

[0036] Implementation case 3: Considering the time and cost of firing the entire heat preservation, according to the temperature field of the single crystal furnace, design the mold first, make a 6cm high heat preservation one-sixth circular plate, and then divide it into small pieces with an inner circle cutting machine.

[0037] Furnace installation: first clean the furnace, adjust the heating graphite resistance plate, add high temperature resistant inorganic salt high temperature resistant crystal slats (YAG crystal), the crystal has good insulation and thermal conductivity. Put the graphite tray on the crystal slats, adjust the center position, put the graphite crucible filled with raw materials, install the graphite resistor, make a transverse gradient molybdenum skin insulation, and add a multi-layer molybdenum skin cover. Check the observation port to directly see the raw materials in the crucible mouth, so as to observe the melting state of the raw materials. Check th...

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PUM

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Abstract

The invention discloses a method for heating an yttrium lithium fluoride crystal at high frequency. The method comprises: cleaning a hearth, arranging a graphite resistor plate block, and arranging aninorganic salt heat-resistant crystal plate strip; putting a graphite tray on the crystal plate strip, adjusting the central position, and putting a sintering mold filled with a yttrium fluoride rawmaterial; completing transverse gradient molybdenum skin heat insulation, and arranging a multilayer molybdenum skin upper cover; closing a furnace door, and vacuumizing; closing the gate, heating, keeping a vacuum pump working, closing a vacuum valve when the temperature reaches 600-700 DEG C, and closing the vacuum pump; introducing an inert gas to protect, continuously keeping the heating whenthe vacuum meter is 0.1-0.2 p, and making the vacuum meter achieve 0.4-0.5 p; heating while observing the change of the raw materials in the furnace, continuously heating after the raw materials collapse, and cooling according to a set cooling program after secondary melting. According to the invention, by using the high-frequency heating method, the growth is conducted in a sealed inert gas protective atmosphere, so that the raw materials can be repeatedly used.

Description

technical field [0001] The invention relates to a high-frequency heating method, in particular to a high-frequency heating method for yttrium lithium fluoride crystal. Background technique [0002] YLF crystal has good optical properties, thermal properties and chemical stability. Its UV absorption cut-off edge is short, the light transmission band is wide, the transmittance is high, the light damage threshold is high, and the lattice phonon energy is low. It is a kind of Excellent laser crystal matrix material. Substitution of Y in part of the YLF lattice with trivalent rare earth ions 3+ Ions can form a variety of laser crystals with excellent performance. Nd:YLF(LiY 1-x Nd x f 4 ) crystal, that is, the trivalent rare earth ion Nd 3+ Replace Y in section YLF 3+ A near-infrared laser crystal material with excellent performance formed by ions. Due to Nd 3+ ion substitution Y 3+ Ions do not have the problem of unbalanced electricity prices, and Nd:YLF still has a te...

Claims

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Application Information

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IPC IPC(8): C30B15/14C30B29/12
CPCC30B15/14C30B29/12
Inventor 万文万黎明
Owner 安徽环巢光电科技有限公司
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