Study Of Technology For Zirconia Single-crystal Optic-fibres Grown By The Method Of Ring Laser Heating System

As the technology of high-temperature measurement developed, In many applications,such as the testing of new weapons explosive power for military applications,the evaluationof performance that are urgent to operating more than 2000℃high-temperature sensors.Sapphire fiber-optic is the most successful and most sophisticated in high-temperaturemeasurement applications . However, the melting point of the sapphire crystal, 2045℃,limits their application to operation below 2000℃. In order to make fiber-optic temperaturemeasurement sensors meet the requirements of the higher temperature measurement, byseveral materials comparison, we chose a zirconia single-crystal fibre (SCF) as a substitute forthe sapphire fibre in high-temperature sensing.At present we have growed the melting point of 2690℃stretch of Y2O3-ZrO2 (Y2O3stablized ZrO2) single-crystal optic-fibers by the Laser Heated Pedestal Growth (LHPG)method, but grown by conventional laser heated pedestal growth (LHPG) system, these fibersshowed relatively low optical and mechanical qualities due to thermal stress caused by largetemperature gradient during the growth. Therefore, this paper based on the design of theLHPG, we designed a ring laser heating system for growing zirconia single-crystal fiber-optic,it established a scientific and reasonable optical system in order that the laser beam can heatZrO2 source rod to melting, so that the zone of melting crystal could form uniform and stableheat source. Melting zone to be stable, it will put into the melting zone seed (seed crystal canbe used Pt wire or other similar nature of single-crystal optic-fibers), the stepper motor controlsystem could pulled up the seed crystal, the fibre grown along the seed crystal. Keep theposition of Laser focus remains unchanged, meanwhile the source rod rise to a certain speed.Precise control of crystal pulling speed and the lift rod ZrO2 source can control the speed ofzirconia single-crystals drawn fiber diameter, circular heat source heating can reduce the crystals stick to the temperature gradient within the thermal stress, and then pulled out toensure zirconia single crystal fibers in the chemical properties, mechanical properties, lighttransmittance of good features.Experimental results and integrated debugging, the use of focused laser heating systemring zirconia single-crystal optic-fibers grown, basically all aspects of performance to meetthe requirements of preparation of high-temperature sensor, for the development of the fieldof ultra-high temperature testing is extremely important.