The laser-induced line-narrowing effect, discovered more than thirty years ago, can also be applied to recent studies in high resolution spectroscopy based on electromagnetically induced transparency. In this paper we first present a general form of the transmission width of electromagnetically induced transparency in a homogeneously broadened medium. We then analyze a Doppler broadened medium by using a lorentzian function as the atomic velocity distribution. The dependence of the transmission linewidth on the driving field intensity is discussed and compared to the laser-induced line-narrowing effect. This dependence can be characterized by a parameter which can be regarded as "the degree of optical pumping".
Publication Source (Journal or Book title)
Applied Physics B: Lasers and Optics
Lee, H., Rostovtsev, Y., Bednar, C., & Javan, A. (2003). From laser-induced line narrowing to electromagnetically induced transparency: Closed system analysis. Applied Physics B: Lasers and Optics, 76 (1), 33-39. https://doi.org/10.1007/s00340-002-1030-5