Parity-Time Symmetry in Coherently Coupled Vertical Cavity Laser Arrays
Zihe Gao, Stewart T. M. Fryslie, Bradley J. Thompson, P. Scott Carney,, Kent D. Choquette
TL;DR
This paper demonstrates PT symmetry breaking in coupled vertical cavity laser arrays, revealing beam steering and mode dynamics, supported by theoretical predictions and experimental validation.
Contribution
It introduces the first experimental observation of PT symmetry breaking in coherently coupled laser arrays with theoretical analysis.
Findings
Observation of PT symmetry breaking in laser arrays
Experimental confirmation of mode evolution and hopping
Quantitative agreement between theory and experiment
Abstract
We report parity-time (PT) symmetry breaking in electrically injected, coherently coupled, vertical cavity surface emitting laser arrays. We predict beam steering, mode evolution and mode hopping as a consequence of the non-Hermiticity of the array analyzed by temporal coupled mode theory with both asymmetric gain distribution and local frequency detuning. We present experimental confirmation of the predicted mode evolution, mode hopping and PT symmetry breaking with quantitative agreement with the theory.
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