Publications

Proposed for publication in Physical Review A.

Chow, Weng W.; Chow, Weng W.; Phillips, Mark C.

This paper explores quantum-coherence phenomena in a semiconductor quantum-dot structure. The calculations predict the occurrence of inversionless gain, electromagnetically induced transparency, and refractive-index enhancement in the transient regime for dephasing rates typical under room temperature and high excitation conditions. They also indicate deviations from atomic systems because of strong many-body effects. Specifically, Coulomb interaction involving states of the quantum dots and the continuum belonging to the surrounding quantum well leads to collision-induced population redistribution and many-body energy and field renormalizations that modify the magnitude, spectral shape, and time dependence of quantum-coherence effects.

Proposed for publication in Applied Optics.

Smith, A.V.; Armstrong, Darrell J.; Phillips, Mark C.; Smith, A.V.

We generate optical vortex beams in a nanosecond optical parametric oscillator based on an image-rotating resonator. This efficient new method of vortex generation should be adaptable to pulsed or continuous lasers.

Journal of the Optical Society of America B: Optical Physics

Smith, A.V.; Armstrong, Darrell J.; Phillips, Mark C.; Gehr, Russell J.; Arisholm, Gunnar

We present numerical modeling and laboratory studies of degenerate type I nanosecond optical parametric oscillators. Because the signal and idler waves are identical and parametric gain is phase sensitive, their round-trip phase is a critical parameter. We show that signal spectrum, transverse mode, and conversion efficiency are all strongly influenced by this phase. We also examine the influence of signal-wave injection seedine and phase-velocity mismatch. © 2003 Optical Society of America.