Abstract
Abstract The application of electromagnetically induced transparency (EIT) in high speed optical switching has remained as a key topic in research related to all optical switching. Demonstration of optical switching through EIT realized under ladder (Ξ) level coupling has been reported earlier. Due to narrow linewidth ( Г EIT ) and low coherent dephasing rate ( γ ) the EIT needs to be prepared only once to demonstrate such switching action. However, in a Ξ system the EIT is accompanied with double resonance optical pumping (DROP) signal, which is limited by spontaneous decay ( Г ) rates. It has been shown by our group that the simultaneous presence of DROP–EIT combination paves the way for executing a kind of slow–fast switching action. However the focus always remain on improving the modulation depth in such type of coherence assisted switch. Here we report a possible way to improve modulation depth by using an additional (named ‘repumping’ after convention used in laser cooling experiments) laser in the Ξ system. The 5S 1/2 →5P 3/2 →5D 5/2 level coupling scheme of 87 Rb atom is used in the current experiment.
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