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Second-harmonic generation in an optical fibre by self-written χ(2) grating

Second-harmonic generation in an optical fibre by self-written χ(2) grating

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A mechanism for phase-matched generation of second-harmonic (SH) light in an optical fibre has been experimentally and theoretically studied. A weak non-phase-matched SH signal, created via the quadrupole polarisation, initiates the self-writing of an axially periodic pattern of colour centres which is postulated to lead to the growth of a χ (2) grating. The grating (at the phase-match period) gives rise to SH generation at efficiencies of 0.5%. The spectral bandwidth of this χ (2) grating is 0.24 nm.

References

    1. 1)
      • U. Österberg , W. Margulis . Dye laser pumped by Nd: YAG laser pulses frequency doubled in a glass optical fibre. Opt.Lett. , 516 - 518
    2. 2)
      • D.S. Bethume . Quadrupole second-harmonic generation for a focused beam of arbitrary transverse structure and polarisation. Opt. Lett. , 287 - 289
    3. 3)
      • G.N. Greaves . Intrinsic and modified defect states in silica. J. Non-Cryst. Solids , 295 - 311

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