Mark Allen Cheverton

Additive manufacturing of PZT-5H piezoceramic for ultrasound transducers

This paper describes the development of a low-cost, high speed manufacturing process method for the fabrication of piezoelectric ceramic transducer elements in the 1-25 MHz frequency range. A modified multi-layer lithography process, is used to additively manufacture high-resolution netshape ceramic structures by photopolymerizing a ceramic-polymer slurry using structured light patterns. The paper elaborates on the key considerations in the development of the process including the selection and optimization of slurry materials for the deposition of PZT 5H materials, optical exposure parameters, debinding/sintering profiles and post-manufacturing processing. coupling coefficient in the range of 0.52-0.54. Ongoing work includes improvements to materials properties, improved throughput and geometric fidelity.

High-performance Er/Yb-doped waveguide optical amplifier

Single-mode optical amplification in novel rare-earth-doped multimode waveguides is demonstrated, at what we believe is the highest gain per unit length yet reported. Design and measurements of a single-pass and double-pass waveguide amplifier are presented.