Abstract
In conjunction with the Stark field induced power enhancement in optically pumped far infrared lasers, absorption transitions in a degenerate two level system under the influence of an weak static Stark field have been analyed. A third order theory to the density matrix formalism leads to zero field level crossing signals for absorption in rate equation approximation and in Doppler limit. For fast relaxation among Zeeman sublevels, the zero field level crossing signal arises from population effect. Optoacoustic measurements have been carried out on the ν5,qQ(16,8) absorption line of CH3OH which produces the familiar 119-μm laser with the CO2 9P(36) pump line. The optoacoustic absorption signals observed are well reproduced by the theoretical expression.
Similar content being viewed by others
References
M.S. Tobin and R.E. Jensen: IEEE J. Quantum Electron. QE-13 (1977) 481.
M.Inguscio, A.Moretti and F.Strumia:IEEE J. Quantum Electron. QE-16(1980)955.
N. Sokabe, K. Horikawa and A. Murai: Conf. Digest of Nineth Int. Conf. on IR and Millimeter Waves, Takarazuka, 1984, p.457.
N.Sokabe, K.Horikawa, N.Zumoto and A.Murai: Int. J. IR and MM Waves6 (1985) 893.
F.Strumia, M.Inguscio and A.Moretti:Laser Spectroscopy V, eds. A.R.W.McKellar, T.Oka and B.P.Stoicheff (Springer, Berlin, 1981) p.255.
F.Strumia.Advances in Laser Spectroscopy, eds. F.T.Arecchi, F.Strumia and H.Walther (Plenum, N.Y., 1983) p.267.
S.Stenholm,Foundations of Laser Spectroscopy, (John Wiley, N.Y., 1984) p.178.
C.H.Townes and A.L.Schawlow:Microwave Spectroscopy, (McGraw Hill, N. Y., 1955) p.96.
J.O.Henningsen, IEEE J. Quantum Electron.QE-13 (1977), 435.
C.O.Weiss: IEEE J. Quantum Electron.QE-12, (1976) 580.
J.Heppner, C.O.Weiss, U.Hubner and G.Schinn: IEEE J. Quantum Electron.QE-16 (1980) 392.
R.M.Lees: J. Chem. Phys. 57 (1972) 2249.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sokabe, N., Tamura, Y., Matsushima, K. et al. Nonlinear level crossing in the infrared transitions of optically pumped far infrared laser media. Int J Infrared Milli Waves 8, 1145–1163 (1987). https://doi.org/10.1007/BF01010818
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01010818