Colloquium: Alan Hedges and Gregg Davis

    Date: 
    Thursday, March 22, 2018 - 3:30pm - 5:00pm
    Location: 
    Meinel 307
    Description: 

    The Path to Freeform Optics, Diamond Turned Optics from the perspective of II-VI Infrared

    Abstract(s): 

    Following a brief introduction to the II-VI organization, this presentation will describe how, over the past 25 years, the advancing technology needs of the CO2 Industrial Laser Market drove II-VI to be an early adopter of freeform diamond turning technologies including Fast Tool Servo (FTS) and Slow Tool Servo (STS).  The successful integration of FTS and STS in every-day production has led to investment in other accessories that further extend the capability of these ultra-precision machines and expand the range of materials that can be processed with diamond tools.  Such devices include micromilling spindles, vibration-assisted tool posts and laser-assisted tool posts.  Post-processing techniques have also been developed to reduce the appearance of diffraction from the orderly pattern of diamond turning lines.  Reduction of this effect is necessary for diamond turning to become a viable option in visible and UV applications.

    Speaker Bio(s): 

    Dr. Alan R. Hedges received a Bachelor of Science Degree in Physics from Southampton University, UK and his PhD from Imperial College, London. Dr. Hedges is the Director of IR Engineering & Precision Machining at II-VI Incorporated where he has worked for 25 years. Prior to joining II-VI, Dr. Hedges was an Optical Engineer at British Aerospace, Stevenage, UK and at Speeding Systems, Rochester Hills, MI, USA. During his time at II-VI, Dr. Hedges has helped build one of the world’s largest diamond turning operations and he has gained considerable experience in ultra-precision machining and testing of optics for a wide range of applications.

    Gregg Davis received a Masters of Science Degree in Mechanical Engineering from The Pennsylvania State University. He is a Senior Engineer in the Diamond Turning Department at II-VI Infrared where he has worked for 14 years. He develops and optimizes diamond turning processes for the production of freeform and other complex geometry components.