Polarization-rotation resonances with subnatural widths using a control laser Sapam Ranjita Chanu, Kanhaiya Pandey, Vineet Bharti, Ajay Wasan and Vasant Natarajan EPL, 106 4 (2014) 43001 Published online: 23 May 2014 DOI: 10.1209/0295-5075/106/43001