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The properties of the cladding modes of an optical fibre, excited by photoinduced long-period fibre gratings, were investigated by the near-and far-field methods. It is shown that the cladding modes considered are of the HE 1m type. A satisfactory agreement between the experimental and calculated distributions of the electromagnetic field of the modes is demonstrated. It was found that the propagation length of a cladding mode in the unperturbed fibre reaches 1 m.

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Analytical formulas for the critical ionization field of the microwave driven H-atom are derived. Good agreement with measured ionization fields is obtained.

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