Horizontal directional solidification preparation method of large-size Re:YAP series laser crystal

A technology of laser crystal and horizontal orientation, which is applied in the direction of self-solidification, crystal growth, chemical instruments and methods, etc., can solve problems such as differences in thermal expansion coefficients, difficulties in growing large-size and high-quality crystals, and achieve large size, obvious economic benefits and Social benefits and cost-saving effects

Inactive Publication Date: 2013-09-18
HARBIN INST OF TECH
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the anisotropy of Re:YAP crystals, the thermal expansion coefficients of different cr

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1:

[0032] Put 3Kg of pre-crystallized high-purity block Nd:YAP powder into a boat-shaped molybdenum crucible washed with alcohol, and then load the furnace. The furnace is evacuated until the vacuum degree reaches 5×10 -3 At Pa, resistance heating is performed to increase the temperature. When the temperature is increased to observe the melt flow line and the power rises to 27kW, observe the melt flow and adjust the power change appropriately (250W / h) to make the solid-liquid conversion phenomenon of orderly convection just appear on the liquid surface. Wait for the raw material to melt completely, keep it for 3h. The seed crystal is slowly moved into the high temperature zone, the direction of the seed crystal adopts the (010) direction, and the position of the seed crystal is located at the geometric center of the crucible. The melt contacted the seed crystal for 3mm, kept the melted crystal for 5 minutes, and started to pull the crucible to seed in the horizo...

Example Embodiment

[0033] Example 2:

[0034] Put 6Kg of prepared pre-crystallized high-purity block Tm:YAP powder into a boat-shaped molybdenum crucible washed with alcohol, install the furnace, and evacuate the furnace until the vacuum degree reaches 5×10 -3 At Pa, resistance heating is performed to increase the temperature. The power was increased to 28kW and the melt flow was observed. It was found that the mist on the liquid surface increased. It was judged that the temperature in the crucible was too high. Therefore, the power change was fine-tuned at 500W / h to make the solid-liquid conversion phenomenon of orderly convection just appear on the liquid surface. After fully dissolving the material, keep it for 1h. The direction of the seed crystal is (010), and the position of the seed crystal is at the geometric center of the crucible. Slowly move the seed crystal into the high temperature zone, make the melt contact the seed crystal for 5mm, keep the molten crystal for 10 minutes, start to p...

Example Embodiment

[0035] Example 3:

[0036] Put 4.5Kg of the prepared pre-crystallized high-purity block Er:YAP powder into a boat-shaped molybdenum crucible washed with alcohol, install the furnace, and evacuate the furnace until the vacuum degree reaches 5×10 -3 At Pa, resistance heating is performed to increase the temperature. The power was increased to 28kW, the melt flow was observed, and the power change was fine-tuned with 500W / h, so that the solid-liquid conversion phenomenon of orderly convection just appeared on the liquid surface. Wait for the raw material to melt completely, keep it for 5h. The seed crystal is slowly moved into the high temperature zone, and the direction of the seed crystal adopts the (010) direction. Make the melt contact the seed crystal for 4mm, keep the melted crystal for 8min, start to pull the crucible to seed in the horizontal direction, the seeding rate is 0.5mm / h, the seeding will enter the shoulder growth process after 15 hours, and the shoulder angle is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a horizontal directional solidification preparation method of a large-size Re:YAP series laser crystal, which is technologically characterized in that the Re:YAP laser crystal is grown by horizontal directional solidification crystallization under a vacuum condition. The specific growth process comprises six major steps of material melting, seeding, shouldering, equal-width growth, cooling and annealing. The method provided by the invention combines the advantages of a directional crystallization process and a vertical zone-melting process in growing crystals; and the prepared Re:YAP laser crystal has the advantages of higher quality, larger size, higher utilization rate, low defect density, better laser performance, non-doped ion core, low cost, low energy consumption and the like.

Description

technical field [0001] The invention relates to a method for growing single crystals of refractory oxides, in particular to a method for preparing large-scale plate-like Re:YAP series single crystals by horizontal directional solidification. Background technique [0002] Yttrium aluminate crystal is a high-quality laser crystal developed in the late 1960s and early 1970s. It is a potential substitute crystal for yttrium aluminum garnet crystal. It has excellent optical, chemical, thermal and mechanical properties. Its chemical formula is YAlO 3 (YAP). YAP crystal belongs to the orthorhombic crystal system, the space group is D 2h 16 -P bnm . This weaker spatial symmetry gives this crystal two main advantages: (1) when pumped at higher powers, the natural birefringence of the YAP crystal dominates over the thermal birefringence; (2) Anisotropy of stimulated emission. The solid-state laser based on YAP has the property of outputting linearly polarized light. Selecting an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C30B29/24C30B11/00
Inventor 张明福聂颖郭怀新韩杰才赵盼盼闫润泽
Owner HARBIN INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap