We show that the Wigner fuction of a cavity field can be constructed from the spontaneous emission spectrum in driven three-level atomic systems. We consider two configurations, the upper-and lower-level couplings, in which the driving field is the quantized field inside a cavity. In the proposed method, the Wigner function of the driving field is recovered in a straightforward manner, without much mathematical manipulation of the experimental data, from the spontaneous emission spectra.
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