Optical gain in an optically driven three-level Lambda system in atomic Rb vapor
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2017 Informa UK Limited, trading as Taylor & Francis Group. In this work, we report experimentally achieved optical gain of a weak probe beam in a three-level (Formula presented.) system in a low density Rubidium vapor cell driven by a single pump beam. The maximum measured gain of the probe beam was about 0.12%. This work could lead to new approaches for enhancing molecular spectroscopy applications.