12 May 2016 Laser heated pedestal growth system commissioning and fiber processing
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Abstract
A new Laser Heated Pedestal Growth system was designed and fabricated using various aspects of effective legacy designs for the growth of single-crystal high-temperature-compatible optical fibers. The system is heated by a 100-watt, DC driven, CO2 laser with PID power control. Fiber diameter measurements are performed using a telecentric video system which identifies the molten zone and utilizes edge detection algorithms to report fiber-diameter. Beam shaping components include a beam telescope; along with gold-coated reflaxicon, turning, and parabolic focusing mirrors consistent with similar previous systems. The optical system permits melting of sapphire-feedstock up to 1.5mm in diameter for growth. Details regarding operational characteristics are reviewed and properties of single-crystal sapphire fibers produced by the system are evaluated. Aspects of the control algorithm efficacy will be discussed, along with relevant alternatives. Finally, some new techniques for in-situ processing making use of the laser-heating system are discussed. Ex-situ fiber modification and processing are also examined for improvements in fiber properties.
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Michael Buric, Michael Buric, M. J. Yip, M. J. Yip, Ben Chorpening, Ben Chorpening, Paul Ohodnicki, Paul Ohodnicki, } "Laser heated pedestal growth system commissioning and fiber processing", Proc. SPIE 9852, Fiber Optic Sensors and Applications XIII, 985219 (12 May 2016); doi: 10.1117/12.2224480; https://doi.org/10.1117/12.2224480
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