|I study extreme light-matter interactions using a combination of ultraintense, ultrashort lasers and highly parallel supercomputing. Most of this work is done in collaboration with my colleagues in the OSU High Energy Density Physics Group. I use our 400 TW Scarlet laser and the Ohio Supercomputer Center, as well as other lasers and supercomputers around the country.|
4180 Physics Research Building
The Ohio State University
191 West Woodruff Ave
Columbus, OH 43210
Intro to Lasers
OSU Department Of Physics
OSU HEDP Group
The American Physical Society
The Optical Society of America
|I study the interaction of extremely intense light with matter. At lower intensities, this is the domain of nonlinear optics including such spectacular phenomena as white light continuum generation and filamentation. At somewhat higher intensities, this becomes laser damage, known in other contexts as laser surgery or laser machining. At the highest intensities, this is the domain of relativistic laser plasma physics. In this regime, electrons are accelerated close to the speed of light in a fraction of an optical cycle, lasers becomes sources of x-rays, gamma rays, electron and ion beams, and antimatter, and states of matter are created that can only be found naturally in the cores of planets or the interiors of stars.|
I've kept this section for nostalgia. Following are just some pictures from my first lab located in Smith Hall and some of my first students.
The main laser system in my lab was based on Ti:Sapphire and produced 60 fs pulses with 1 mJ/pulse at a 1 kHz repetition rate. The pulses could be shaped using a LCD based pulse shaper. Below are two pictures of the laser system. It occupied a single 10' x 4' table. We also had numerous dye lasers for atomic excitation.
Here is what continuum generation looks like. Shown below is the result of sending our laser pulses through 1 mm of pure sapphire at a pulse energy around 2 uJ. The pulse energy increases slightly from left to right.
Here is continuum generation from a microstructure fiber using 1 nJ pump pulses (but lots of them).