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CREOL, The College of Optics & Photonics

Seminar: "Rare-Earth-Doped Single-Crystal YAG Fibers Grown by the Laser Heated Pedestal Growth Technique" by Dr. Craig Nie

Monday, May 15, 2017 11:00 AM to 12:00 PM
CREOL Room 103

Dr. Craig Nie
Rutgers University
Department of Materials Science and Engineering


The laser-heated pedestal growth (LHPG) technique is an unconventional method for growth of single-crystal (SC) fibers, with the advantages of high pulling rates and crucible-free processing. The processing of rare-earth (RE3+) doped yttrium aluminum garnet, Y3Al5O12, (YAG) fibers using the LHPG technique was significantly improved upon as the result of the development of a new, more accurate method to align the CO2 laser along with the minimization of waveguide irregularities. Initially, the dominant loss mechanism in the SC fibers was bulk scattering, but with this new alignment method, absorption became the dominant loss mechanism with minimal scattering. This loss is primarily attributed to the bulk absorption of the raw material. At non-absorbing wavelengths holmium doped YAG fibers have an equivalently low loss, allowing for a SC fiber laser to be developed.


Dr. Craig Nie received his B.A. in Physics and Mathematics from Coe College in 2012, and a Ph.D. in Materials Science and Engineering from Rutgers University in 2017. As an undergraduate he studied alkaline earth silicate glasses, and expanded the glass forming range using laser aerodynamic levitation. He then transitioned to single-crystal systems at Rutgers, specializing in the LHPG technique, where he is currently a postdoctoral researcher.

For additional information:

Kathleen Richardson


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