Northern, J. H. and Ritchie, G. A. D. and Smakman, E. P. and van Helden, J. H. and Cockburn, J. and Duxbury, G. (2010) Rapid passage signals induced by chirped quantum cascade laser radiation: K state dependent-delay effects in the nu(2) band of NH3. Optics Letters, 35 (16). pp. 2750-2752. ISSN 0146-9592Full text not available in this repository. (Request a copy from the Strathclyde author)
In this Letter, a 10 mu m quantum cascade laser operating in the intrapulse mode is used observe rapid passage (RP) effects within a 40 cm 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.
|Keywords:||spectroscopy, optics, laser radtiation, Optics. Light, Atomic and Molecular Physics, and Optics|
|Subjects:||Science > Physics > Optics. Light|
|Department:||Faculty of Science > Physics|
|Depositing user:||Pure Administrator|
|Date Deposited:||21 May 2011 14:33|
|Last modified:||27 Apr 2016 16:49|