Abstract

In this Letter, a 10μm quantum cascade laser operating in the intrapulse mode is used observe rapid passage (RP) effects within a 40cm single-pass gas cell containing low pressures of NH3. The laser tuning range allows the rotational states J=2 with K=0, 1, and 2 to be probed. We show that the RP structures change as a function of optical density and that the magnitude of the delay in the switch from absorption to emission as a function of increased gas pressure is dependent upon the initial value of K. These measurements are qualitatively well modeled using the Maxwell–Bloch equations.

© 2010 Optical Society of America

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