Abstract
We have studied the optical response of a weak signal field in a three-level quantum system consisting of the energy levels of Er3 + ions doped in ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) fiber material. It has been shown that absorption and gain can be significantly modified by changing the conditions of phase-coherence induced in the system by the resonant fields. The role of broad-band incoherent pumping on gain equalization is investigated. Our results highlight gain leveling over a substantial range of frequencies at a particular condition of dynamically induced phase-coherence. On controlling phase-coherence, the propagation of signal field can be achieved either in subluminal or in superluminal regime.
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Acknowledgement
B. K. Dutta would like to thank the University Grants Commission, New Delhi, India for the financial assistance (Grant No.: PSW-164/11-12).
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Bayal, I., Dutta, B.K., Panchadhyayee, P. et al. Phase control of absorption, dispersion and gain of weak signal field in erbium doped optical fiber. J Opt 41, 235–242 (2012). https://doi.org/10.1007/s12596-012-0087-8
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DOI: https://doi.org/10.1007/s12596-012-0087-8