Abstract

Popular belief is that the study of cw electromagnetically induced transparency (EIT) in a Doppler-broadened medium is limited by the power requirements on the coupling field. Carefully choosing the atomic scheme and field geometry can render these media virtually Doppler-free and so allows a study of continuous-wave BIT.^1,2 The first reported cw inversionless lasing system uses such a Doppler-free scheme.³ We investigate both theoretically and experimentally the wavelength dependence of coherently induced transparency within a Doppler- broadened medium and show that the requirement of wavelength-matched optical fields is in fact not necessary.

© 1996 Optical Society of America