Abstract

A theoretical model to numerically study the local space-charge field induced by light in a photorefractive crystal biased with two independent,perpendicularly oriented external static fields is introduced. This model appears attractive because it allows varying, in the crystal transverse plane,of the orientation of the external biasing static field with respect to that of the optical-field vector, then enhancing the tensorial properties of the crystal. The numerical analysis has revealed that, in a nonconventional biasing configuration, the spatial distributions of the space-charge-field vector transversal components exhibit a further anisotropy that has not been shown up to now. Nevertheless, from a practical point of view, such a boundary configuration could allow better management of the focusing characteristics of the material.

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  1. S. Lan, E. DelRe, Z. Chen, M. Shih and M. Segev, "Directional coupler with soliton-induced waveguides", Opt. Lett., vol. 24, pp. 475-477, 1999.
  2. E. DelRe, B. Crosignani, P. Di Porto, E. Palange and A. J. Agranat, "Electro-optic beam manipulation through photorefractive needles", Opt. Lett., vol. 27, pp. 2188-2190, 2002.
  3. D. Haertle, G. Caimi, A. Haldi, G. Montemezzani, P. Gunter, A. A. Grabar, I. M. Stoika and Y. M. Vysochanskii, "Electro-optical properties of Sn2 P2S6", Opt. Commun., vol. 215, no. 4-6, pp. 333 -343, 2003.
  4. G. M. Tosi-Beleffi, F. Curti, D. Boschi, C. Palma and A. J. Agranat, "Soliton-based Y-branch in photorefractive crystals induced through dispersion-shifted optical fiber", Opt. Lett. , vol. 28, pp. 1561-1563, 2003.
  5. A. J. Agranat, M. Razvag and M. Balberg, "Dipolar holographic gratings induced by the photorefractive process in potassium lithium tantalite niobate at the paraelectric phase", J. Opt. Soc. Amer. B, Opt. Phys., vol. 14, pp. 2043-2048, 1997.
  6. A. J. Agranat, E. Littwitz, M. Razvag and A. Rubissa, "Electroholografic wavelength selective photonic switch for WDM routing", PCT Patent WO 01/07 946 A1, Feb. 1, 2001.
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  10. B. Crosignani, P. Di Porto, A. Degasperis, M. Segev and S. Trillo, "Three-dimensional optical beam propagation and solitons in photorefractive crystals", J. Opt. Soc. Amer. B, Opt. Phys., vol. 14, pp. 3078-3090, 1997.
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  13. E. DelRe, M. Tamburrini, R. Della Pergola and A. J. Agranat, "Spontaneous self-trapping of optical beams in metastable paraelectric crystals", Phys. Rev. Lett., vol. 83, pp. 1954-1957, 1999.
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  23. M. Saffman and A. A. Zozulya, "Circular solitons do not exist in photorefractive media", Opt. Lett., vol. 23, pp. 1579 -1581, 1998.

Opt. Lett. (9)

S. Lan, E. DelRe, Z. Chen, M. Shih and M. Segev, "Directional coupler with soliton-induced waveguides", Opt. Lett., vol. 24, pp. 475-477, 1999.

E. DelRe, B. Crosignani, P. Di Porto, E. Palange and A. J. Agranat, "Electro-optic beam manipulation through photorefractive needles", Opt. Lett., vol. 27, pp. 2188-2190, 2002.

M. Morin, G. Duree, G. Salamo and M. Segev, "Waveguide formed by quasi-steady-state photorefractive spatial solitons", Opt. Lett., vol. 20, pp. 2066 -2068, 1995.

M. Segev, G. C. Valley, S. R. Singh, M. I. Carvalho and D. N. Christodoulides, "Vector photorefractive spatial solitons", Opt. Lett., vol. 20, pp. 1764-1766, 1995.

E. DelRe, M. Tamburrini and A. J. Agranat, "Soliton electro-optic effects in paraelectrics", Opt. Lett., vol. 25, pp. 963-965, 2000.

E. DelRe, A. Ciattoni and A. J. Agranat, "Anisotropic charge displacement supporting isolated photorefractive optical needles", Opt. Lett., vol. 26, pp. 908-910, 2001.

S. Gatz and J. Herrmann, "Anisotropy, nonlocality and space-charge field displacement in (2+1) -dimensional self-trapping in biased photorefractive crystals", Opt. Lett., vol. 23, pp. 1176-1178, 1998.

E. DelRe, B. Crosignani, M. Tamburrini, M. Segev, M. Mitchell, E. Rafaeli and A. J. Agranat, "One-dimensional steady-state photorefractive spatial solitons in centrosymmetric paraelectric potassium lithium tantalite niobate", Opt. Lett., vol. 23, pp. 421-423, 1998.

M. Saffman and A. A. Zozulya, "Circular solitons do not exist in photorefractive media", Opt. Lett., vol. 23, pp. 1579 -1581, 1998.

Other (14)

E. DelRe, M. Tamburrini, R. Della Pergola and A. J. Agranat, "Spontaneous self-trapping of optical beams in metastable paraelectric crystals", Phys. Rev. Lett., vol. 83, pp. 1954-1957, 1999.

S. Gatz and J. Herrmann, "Propagation of optical beams and the properties of two-dimensional spatial solitons in media with a local saturable nonlinear refractive index", J. Opt. Soc. Amer. B, Opt. Phys., vol. 14, pp. 1795-1806, 1997.

W. Krolikowski, N. Akhmediev, B. Luther-Davies and M. Cronin-Golomb, "Self-bending photorefractive solitons", Phys. Rev. E, Stat. Phys. Plasmas Fluids Relat. Interdiscip. Top., vol. 54, pp. 5761-5765, 1996.

J. Petter, C. Weilnau, C. Denz, A. Stepken and F. Kaiser, "Self-bending of photorefractive solitons", Opt. Commun., vol. 170, pp. 291-297, 1999.

E. DelRe and A. J. Agranat, "Dielectric nonlinearity in photorefractive spatial soliton formation", Phys. Rev. A, Gen. Phys., vol. 65.053 814, pp. 1-5, 2002.

A. Yariv and P. Yeh, Optical Waves in Crystals: Propagation & Control of Laser Radiation , New York: Wiley, 1983, pp. 256-264.

S. H. Wemple and M. DiDomenico Jr., Electrooptical and Nonlinear Optical Properties of Crystals, R. Wolfe, Ed. New York: Academic, 1983, p. 264.

M. Shih, Z. Chen, M. Mitchell, M. Segev, H. Lee, R. S. Feigelson and J. P. Wilde, "Waveguides induced by photorefractive screening solitons", J. Opt. Soc. Amer. B, Opt. Phys., vol. 14, pp. 3091-3100, 1997.

B. Crosignani, P. Di Porto, A. Degasperis, M. Segev and S. Trillo, "Three-dimensional optical beam propagation and solitons in photorefractive crystals", J. Opt. Soc. Amer. B, Opt. Phys., vol. 14, pp. 3078-3090, 1997.

B. Crosignani, P. Di Porto, M. Segev, G. Salamo and A. Yariv, "Photorefractive spatial solitons", Rivista del Nuovo Cimento, vol. 21, pp. 1-37, 1998.

D. Haertle, G. Caimi, A. Haldi, G. Montemezzani, P. Gunter, A. A. Grabar, I. M. Stoika and Y. M. Vysochanskii, "Electro-optical properties of Sn2 P2S6", Opt. Commun., vol. 215, no. 4-6, pp. 333 -343, 2003.

G. M. Tosi-Beleffi, F. Curti, D. Boschi, C. Palma and A. J. Agranat, "Soliton-based Y-branch in photorefractive crystals induced through dispersion-shifted optical fiber", Opt. Lett. , vol. 28, pp. 1561-1563, 2003.

A. J. Agranat, M. Razvag and M. Balberg, "Dipolar holographic gratings induced by the photorefractive process in potassium lithium tantalite niobate at the paraelectric phase", J. Opt. Soc. Amer. B, Opt. Phys., vol. 14, pp. 2043-2048, 1997.

A. J. Agranat, E. Littwitz, M. Razvag and A. Rubissa, "Electroholografic wavelength selective photonic switch for WDM routing", PCT Patent WO 01/07 946 A1, Feb. 1, 2001.

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