Abstract
We perform a detailed theoretical analysis of electromagnetically induced absorption (EIA) and electromagnetically induced transparency (EIT) resonance width and amplitude as a function of laser power for different rates of spontaneous coherence transfer from the excited to the ground states. Our results show that the EIA signal undergoes a power broadening much smaller than EIT and is even free from power broadening in a specific condition that we analyse. Furthermore, the amplitude of the EIA signal is always larger than the amplitude of EIT, which constitutes an advantage in applications like magnetometers and light storage processes.
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