Chirped fiber bragg grating - -, a laser system and method for the dispersive correction demands

摘要

Chirped fiber bragg grating - -,characterized in thatthe chirped fiber - bragg - grid (cfbgs) as a nonlinear chirped fiber - bragg - grid is formed, wherein the cfbgs within a predeterminable an angular frequency ω₀ , and ω₁ limited spectral range located at the bragg - wavelengths λ_B(l) are impressed in accordance with the following design rule:in which the penetration depth l (ω) described below, the equation with:l (ω): penetration depth into the cfbgs for light of wavelength λ = 2πc / ω,ω: angular frequency of the light,c: vacuum - speed of light,n (ω): refractive index of the fiber andGdds (ω): the groups running time dispersion, a first a freely selectable contribution c₂ for the linear phase of the lattice structure of the cfbgs (zeroth order of the opening degree of dispersion, φ (ω)) and a further additional contribution c₁ to the difference of the groups - and the phase delay of the cfbg (first order of dispersion, dφ (ω) / dω) coordinated in such a way that for the predetermined angular frequency ω₁ a predetermined depth of penetration, preferably the maximum available length l_ges of the cfbg, is realized, and the impressed bragg - wavelengths λ_B(l), respectively, satisfy the following equation:where ω (l) the inverse..