D. Pour-les-niveaux and L. Sous, niveaux ne sont pas résolus, on doit faire une moyenne des déplacements hyperfins, pondérée par l'intensité de la transition à deux photons vers le sousniveau hyperfin considéré, ces facteurs de pondération sont respectivement 2/9 pour la transition (j=1/2, F=1) vers (j=5/2, F=2) et 7/9 pour la transition (j=1/2, F=1) vers (j=5/2, F=3). Les déplacements de structure hyperfine étant Il vient : solution que l'on notera symboliquement, 1989.

. Finalement-le-champ-dans-le-cristal-taillé-À-l, incidence de Brewster s'écnt : avec : A x = x 2 / w 2 x (1+i03C4 x ) et A y = y 2 / w 2 y (1+i03C4 y ) On peut donc maintenant suivre pas à pas les calculs de Boyd et Kleinman. Les numéros des équations de [Boyd 1968] seront signalés par une étoile (par exemple 2.2*) et la nouvelle équation pour l'incidence à Brewster sera réécrite à coté

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G. W. Erickson, Energy levels of one???electron atoms, Journal of Physical and Chemical Reference Data, vol.6, issue.3, p.831, 1977.
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J. Garreau, Thèse de doctorat de l, Université Paris, vol.6, 1989.

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E. W. Hagley and F. M. Et-pipkin, fine structure interval, Physical Review Letters, vol.72, issue.8, p.1172, 1994.
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L. N. Hand, D. G. Miller, and R. Et-wilson, Electric and Magnetic Form Factors of the Nucleon, Reviews of Modern Physics, vol.35, issue.2, p.335, 1963.
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K. C. Harvey, C. Et-fehrenbach, and . Jr, Semiconductor detector for the selective detection of atomic hydrogen, Review of Scientific Instruments, vol.54, issue.9, p.1117, 1983.
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J. W. Heberle, H. A. Reich, and P. Et-kusch, Hyperfine Structure of the Metastable Hydrogen Atom, Physical Review, vol.101, issue.2, p.612, 1956.
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E. Hellwig, R. F. Vessot, M. W. Levine, P. W. Zitzewitz, D. W. Allen et al., Measurement of the Unperturbed Hydrogen Hyperfine Transition Frequency, IEEE Transactions on Instrumentation and Measurement, vol.19, issue.4, p.200, 1970.
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H. W. Kogelnik, E. P. Ippen, A. Dienes, and C. S. Shank, Astigmatically compensated cavities for CW dye lasers, IEEE Journal of Quantum Electronics, vol.8, issue.3, p.373, 1972.
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V. Kumar and E. Et-krishnakumar, Measurement of concentration and study of recombination of atomic hydrogen by Wrede???Harteck method, Review of Scientific Instruments, vol.50, issue.6, p.776, 1979.
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W. E. Lamb and R. C. Et-retherford, Fine Structure of the Hydrogen Atom by a Microwave Method, Physical Review, vol.72, issue.3, pp.241-75, 1947.
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S. A. Lee, R. Wallenstein, and T. W. Et-hänsch, Lamb Shift Measured by Laser Spectroscopy, Physical Review Letters, vol.35, issue.19, p.1262, 1975.
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S. Lin, Z. Sun, B. Wu, and C. Et-chen, crystal, Journal of Applied Physics, vol.67, issue.2, p.634, 1990.
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K. Pachucki, Complete two-loop binding correction to the Lamb shift, Physical Review Letters, vol.72, issue.20, p.3154, 1994.
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