This Site

Graduate Student Seminar - 03/30/2018

"Electron  Avalanche Ionization Driven by Mid-IR Laser Pulses"

by Daniel Woodbury

Advisor:  Professor Howard Milchberg

Friday, March 30, 2018 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Abstract:  Focused, high power picosecond and nanosecond laser pulses can lead to a collisional electron cascade (avalanche) which substantially ionizes a material, even without direct field ionization or photo-ionization of the constituent atoms. Several recently proposed schemes for remote radioactive detection rely on such a laser induced breakdown in air, seeded by free electrons generated through decay of radioactive material. I will present recent results on electron avalanche ionization driven by our novel high-energy mid-IR laser system. Due to the lower photon energy, the breakdown process is markedly different compared to near-IR laser interactions and demonstrates sensitivity to the presence of radioactive material and feasible scaling for standoff detection.

For additional information about the IREAP Graduate Student Seminars, contact Linus Feder.

Return to the Graduate Student Seminar schedule.