Electrical and Computer Engineering ETDs

Publication Date

Spring 3-25-2023

Abstract

The absorbed energy from a short pulse laser produced plasma is proportional to the magnitude of the acoustic wave the plasma launches; however, methods to resolve absolute energy from the acoustic signal are still being developed. This is the first report of quantitatively estimating the energy deposited by a femtosecond laser-induced plasma using a shock wave approximation from acoustic measurements. To further understand energy deposition mechanisms, two diagnostics, a single microphone which measures the acoustic signal propagation and an array of microphones which measure the changing acoustic signal longitudinally along the plasma were developed and implemented to measure the energy absorbed. A weak shock wave approximation model is used to fit results from the acoustic measurements to yield a quantitative energy deposition estimation. These results will help to further understand the relationship between the dynamics of a laser-induced plasma and weak, broadband microwave frequencies known to radiate from them.

Keywords

Plasma physics, Ultra-short pulsed lasers, Energy deposition, Microphones

Document Type

Thesis

Language

English

Degree Name

Electrical Engineering

Level of Degree

Masters

Department Name

Electrical and Computer Engineering

First Committee Member (Chair)

Dr. Edl Schamiloglu

Second Committee Member

Dr. Jennifer Elle

Third Committee Member

Dr. Christos Christodoulou

Download

Share

COinS