An experimental observation of transparency on a transition in the blue spectral region, induced by a continuous-wave (cw) infrared coupling field in a Doppler-broadened medium, is presented. This experimental result is supported by extensive theoretical modeling of the system, a V-type scheme in atomic rubidium vapor. Transparency is observed by a 422-nm probe field on the transition between the hyperfine split ground state ${5S}_{1/2}$ and the excited state ${6P}_{1/2}.$ The coupling laser is employed on the linked transition ${5S}_{1/2}{-5P}_{3/2},$ inducing significant levels of transparency $\mathrm{}(>70\%)\mathrm{}$ nondissipatively and in the absence of optical pumping effects.

• Received 22 July 1997

DOI:https://doi.org/10.1103/PhysRevA.57.1323