We investigate the effects of spontaneously generated coherence (SGC) on the electromagnetically induced transparency features in a four-level Λ-type system. We show that double-transparency windows and a controllable narrow absorption peak can be obtained with the presence of SGC. We present an equivalent system without the rigorous requirement of close-lying levels to observe the phenomena. We also experimentally demonstrate the corresponding features in a rubidium atomic beam.
© 2008 Optical Society of America
Original Manuscript: January 15, 2008
Revised Manuscript: March 2, 2008
Manuscript Accepted: March 3, 2008
Published: March 27, 2008
Chun-Liang Wang, Ai-Jun Li, Xu-Yi Zhou, Zhi-Hui Kang, Jiang Yun, and Jin-Yue Gao, "Investigation of spontaneously generated coherence in dressed states of 85Rb atoms," Opt. Lett. 33, 687-689 (2008)