"Ultrafast Lasers Enabled Optical and Photonic Fabrication and Integration" by Jie Qiao

Seminar by Jie Qiao, Associate Professor, Rochester Institute of Technology

Abstract

Ultrafast lasers enable non-contact, waste free, and precise material modification and removal, enabling 3D fabrication and integration of photonic devices. This talk presents methods, computational models, physical processes, and demonstrations related to femtosecond laser enabled direct writing of waveguides and waveguide lasers, polishing and micro-joining of optical components.  We demonstrate a novel, patent-pending laser polishing technique for figuring and/or finishing optical substrates using ultrafast laser pulses, with single-digit nanometer surface quality achieved. The figuring capability and resulting optical surface quality demonstrate the viability of ultrafast laser polishing as a novel pathway towards precision finishing of optics. Two temperature and pulse propagation modeling were performed to study the nonlinear femtosecond laser-mater interaction in glass and crystal materials. Femtosecond laser inscribed single-mode waveguides in laser crystal and glass materials, as well as microchip lasers based on such waveguides were achieved. We further demonstrated femtosecond-laser-based bonding of optical substrates for optics integration and hermetic sealing of implants.