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Parametric device for wavelength conversion

  • US 20030039023A1
  • Filed: 05/01/2002
  • Published: 02/27/2003
  • Est. Priority Date: 05/01/2001
  • Status: Active Grant
First Claim
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1. Device for performing a parametric process according to which a pump radiation at frequency ω

  • p generates a radiation at frequency ω

    g interacting with at least one signal radiation at frequency ω

    s different from ω

    p, comprising a substantially periodic photonic crystal structure comprising a plurality of unitary cells that follow one other along a predetermined direction, each unitary cell comprising a first layer having a first refractive index n1 and a first length L1, a second layer having a second refractive index n2, with n1 different from n2, and a second length L2, an input for sending said at least one signal radiation at frequency ω

    s along said substantially periodic structure;

    an input for providing said pump radiation at frequency ω

    p to said substantially periodic structure;

    an output suitable to extract from the device said generated radiation at frequency ω

    g;

    characterised in that each unitary cell also comprises a third layer having a third refractive index n3, with n3 different from n2, and a third length L3 and a fourth layer having a fourth refractive index n4, with n4 different from n1 and from n3, and a fourth length L4, the periodical alternance of the first, second, third and fourth layer forming said substantially periodic photonic crystal structure;

    at least one among the first, the second, the third and the fourth layers has a non-linearity of the χ

    2 or χ

    3 type;

    at least one of the following conditions is met;

    a) n1 is different from n3;

    b) n2 is different from n4;

    c) L1 is different from L3;

    d) L2 is different from L4; and

    in that n1, n2, n3, n4, L1, L2, L3, L4 are selected so as to perform the parametric process in phase matching conditions.

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