Efficient low-intensity optical phase conjugation based on coherent population trapping in sodium.
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We have observed optical phase-conjugate gain (>50) in sodium vapor, using low-intensity pump lasers (1 W/cm2), with a response time of the order of 1 μs. Coherent population trapping is experimentally identified as the phase-conjugate mechanism. A theoretical model is presented that supports these observations by showing that coherent population trapping can write large-amplitude nonlinear-optical gratings at laser intensities well below those needed to saturate the optical transitions. © 1995, Optical Society of America.
author list (cited authors)
Hemmer, P. R., Katz, D. P., Donoghue, J., Cronin-Golomb, M., Shahriar, M. S., & Kumar, P.