Young Bae's photonic laser thruster sounds promising. A PLT-powered spacecraft could theoretically push a rocket ship faster than 62 miles per second, allowing a journey to Mars in less than a week.
Bae’s PLT places a laser within a resonant optical cavity to produce stable and reliable thrust, the perfect jive for spacecraft control or propulsion.
Bae will be a presenter at The American Institute of Aeronautics and Astronautics (AIAA) SPACE 2007 Conference & Exposition September 18-20 in Long Beach, California. The line up: Space Transportation Systems, Promising Space Concepts from the NASA Institute of Advanced Concepts (NIAC), Space Systems for the Next 50 Years and Advanced Vehicle Systems.
Wish I could go.

The photonic laser thruster demo(PLT)!