Two-beam coupling in photorefractive Bi12SiO20 crystals with moving grating: Theory and experiments

DOI PDF 被引用文献4件
  • Ph. Refregier
    Thomson-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. No. 10, 91401 Orsay, France
  • L. Solymar
    Thomson-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. No. 10, 91401 Orsay, France
  • H. Rajbenbach
    Thomson-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. No. 10, 91401 Orsay, France
  • J. P. Huignard
    Thomson-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. No. 10, 91401 Orsay, France

説明

<jats:p>Large values of the exponential gain coefficient Γ are obtained (Γ≂8–12 cm−1) when recording with a moving grating in photorefractive BSO crystals (nearly degenerate two-wave mixing; drift recording mode). The resolution of the Kukhtarev’s equations with a moving grating shows a resonance effect which at the optimum velocity makes the modulation of the photoinduced space charge field Esc higher. An optimum of the grating spacing also exists: Λopt:2π(E0/NA)(με/eγR)1/2. In such conditions, the space charge field is phase shifted by π/2 with respect to the incident fringe pattern; this allows an efficient beam coupling between the two recording beams. The dependence of the gain Γ versus the incident beam ratio β of the two interfering waves is interpreted by including the second-order term in the Fourier development of Esc. The conditions allowing one to obtain a reasonable agreement between the theory and experiments are presented and discussed, as well as the adopted values of the crystals’ parameters.</jats:p>

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