Lasers are important as diagnostic tools and in instruments whose use spans a spectrum from materials fabrication to medical applications. The underlying physics is applied to diverse areas such as advanced propulsion systems, X-ray generation, and understanding the properties of complex materials and fluids. This area includes laser technology and applications, X-ray lasers, flow field and combustion diagnostics, multiphoton processes and nonlinear optics, high-energy lasers, atomic and molecular spectroscopy, molecular dynamics, plasmadynamics, high field phenomena, controlled laser-driven molecular and acoustic processes, picosecond and subpicosecond sources, high-energy incoherent source development, advanced spacecraft propulsion, space plasma physics, active space experiments, electric discharge and radiation studies. The mission of the Department of Mechanical and Aerospace Engineering is to educate leaders in engineering and applied sciences through a rigorous graduate program that defines the frontiers of knowledge in our field and prepares them for careers in academia, industry, and government. Our program emphasizes achieving fundamental understanding in a broad range of topics, a deep understanding in a particular area, and excellent communications skills. The majority of outstanding technical problems in today's engineering and applied sciences require a multi-disciplinary approach. Our department has a strong tradition in defining and pursuing new research areas at the intersection of engineering, physics, chemistry, biological sciences, and applied mathematics.