Undergraduate Honors Theses

Thesis Defended

Fall 2013

Document Type



Engineering Physics

First Advisor

Dr. Henry Kapteyn

Second Advisor

Dr. Margaret Murnane


High Harmonic Generation is a non-linear process that enables the tabletop production of coherent laser-like beams in the extreme ultraviolet and soft x-ray regions of the electromagnetic spectrum. In order to achieve significant high harmonic flux, the generated high harmonics must be phase matched. We achieve this by coupling the incident driving laser into a hollow cylindrical waveguide. The power coupling efficiency of this waveguide has an important dependence on spatial beam stability. This thesis discusses the power coupling efficiency of the incident beam into the waveguide with respect to beam position and angle at the entrance of the waveguide. It also presents an active beam stabilization technique which stabilizes both the angle and position of the beam. The performance of this beam stabilization is then be correlated to an increase in the stability of power coupling efficiency with the waveguide.