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Optica Publishing Group
  • International Conference on Quantum Electronics
  • OSA Technical Digest (Optica Publishing Group, 1988),
  • paper MP25

PHASE-MATCHED ELECTRIC-FIELD INDUCED SECOND HARMONIC GENERATION IN OPTICAL FIBRES

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Abstract

Frequency doubling has been recently observed in phosphorous doped single-mode fibres by several workers [1][2] [3]. Since silica exhibits a centre of inversion and thus lacks an electric dipole allowed second order nonlinearity, χ(2) it has been postulated that the non-linear interaction is due to the electric quadrupole and magnetic dipole moments[4]. This process is self-phasematched, and as such there is little choice in the selection of particular interacting modes. Phasematching has been discussed [5] and dc-field-induced second-harmonic generation also considered [6], where phasematching is achieved by proper design of the fibre. Efficient nonlinear devices may also be fabricated by incorporating high χ(3) media as the core of a hollow fibre and using a periodic electrode grating structure for phase matching [7]. The centre of asymmetry is induced by the electric field and phasematching is achieved by the spatial periodicity of the field.

© 1988 Optical Society of America

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