LSD Wave Dynamics

Laser propulsion, a beamed energy propulsion (BEP) is an emerging technology that is capable of revolutionizing manfs access to space. It has high specific impulse and thrust, as well as low propulsion weight since an on-board energy source is not required. One of the working principles of this technology, is simply achieved by irradiating laser beam via a repetitively pulsed operation into the nozzle of a thruster. Understanding the physics of laser-absorption process in laser supported detonation (LSD) and its energy conversion mechanism is vital for the design of an efficient thruster.

The propagation of laser-produced plasma is mainly influenced by photoionization due to UV radiation from the plasma; a phenomenon not characterized by shock-induction as observed in the ZND structure of a chemical detonation wave. Our studies show that plasma propagation is a radiative induced phenomenon and hence preionization play a significant role. We are currently developing a photoionization-induced laser discharge model similar to a streamer discharge model in order to elucidate the dynamics of the LSD wave.

The plasma diagnostics tools utilized in our studies include:

In addition to the experimental work, we are conducting numerical studies in order to simulate the LSD wave dynamics. The ultimate objective would be the implementation of attained results in the design of future laser-propelled vehicles.

Mach-Zehnder interferometer setup (CO2 laser in blue coloured casing)