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Applied Optics

Applied Optics


  • Vol. 23, Iss. 1 — Jan. 1, 1984
  • pp: 87–93

Investigation of cw optically pumped 12-μm NH3 lasers using a tunable diode laser

C. Rolland, J. Reid, B. K. Garside, H. D. Morrison, and P. E. Jessop  »View Author Affiliations

Applied Optics, Vol. 23, Issue 1, pp. 87-93 (1984)

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The small-signal gain of a cw optically pumped 12-μm NH3 system is investigated as a function of pump intensity, pressure, pump offset, and polarization using a tunable diode laser as a probe. In general, the experiment is found to be in good agreement with calculations based on the theory of two laser fields interacting with a three-level molecular system. Raman gains in excess of 3%/cm are obtained using a waveguide configuration. The significance of these findings is discussed in terms of designing an efficient and powerful cw 12-μm laser.

© 1984 Optical Society of America

Original Manuscript: August 23, 1983
Published: January 1, 1984

C. Rolland, J. Reid, B. K. Garside, H. D. Morrison, and P. E. Jessop, "Investigation of cw optically pumped 12-μm NH3 lasers using a tunable diode laser," Appl. Opt. 23, 87-93 (1984)

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  16. These populations were adjusted appropriately when gain calculations were carried out at elevated temperatures.
  17. The vibrational dipole moment was calculated from high-pressure absorption measurements on the sP(7,0) and sP(7,1) transitions using our 12-μm tunable diode laser and agrees with previous published values; see D. C. McKean, P. N. Schatz, J. Chem. Phys. 24, 316 (1956); T. Shimizu, F. O. Shimizu, R. Turner, T. Oka, J. Chem. Phys. 55, 2822 (1971). [CrossRef]
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  22. By tuning the diode laser to the sP(2,0) and sP(10,2) transitions in NH3, we were able to monitor absorption coefficient changes resulting from gas heating. The temperatures corresponding to these new absorption coefficients were then computed using the theoretical model.
  23. This temperature change was measured using the technique described above. Since the tunable diode laser probes the entire cross section of the waveguide, the temperature increase represents only an average over the radial temperature profile of the NH3 gas.
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  26. This conclusion is consistent with the results of a paper to be published by F. Julien, J.-M. Lourtioz, T. A. DeTemple in IEEE J. Quantum Electron. (Nov.1983), which deals with the theoretical modeling of a 12.08-μm ring laser.
  27. Recently, we have improved the performance of the waveguide laser to give an output power of 3 W at 12.08 μm from a 22-W pump. This corresponds to a photon conversion efficiency of 18%.

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