Abstract
The NH3 laser, optically pumped by CO2 laser radiation at 9.2 μm, operates at 12.08 μm wavelength and has been demonstrated to be capable of a short term frequency stability of a few hundred Hertz [1]. Since the laser radiation is strongly absorbed in NH3 one could gain additional long term stability by locking the laser to a saturated absorption dip in NH3. The precision of the lock would be considerably improved if the 3 hyperfine structure components of the 12 μm sP(7,0) transition could be resolved. However, using the present published value for the upper state quadrupole coupling constant (eqQ)v 2 = 1,a [2] the calculated separation of these components was uncertain by ≥ 100 kHz.
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References
K.J. Siemsen, E. Williams and J. Reid: Opt. Lett 12, 879 (1987)
G. Magerl, W. Schupita, J. Frye, W. Kreiner and T. Oka: J. Mol. Spectr. 107, 72 (1984)
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© 1989 Springer-Verlag Berlin, Heidelberg
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Siemsen, K.J., Madej, A.A., Reid, J. (1989). Saturation Spectroscopy with the NH3 Laser. In: De Marchi, A. (eds) Frequency Standards and Metrology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74501-0_98
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DOI: https://doi.org/10.1007/978-3-642-74501-0_98
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-74503-4
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