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A family of curved Fresnel lenses for integrated optics: modelling by the beam propagation method

1994; Springer Science+Business Media; Volume: 3; Issue: 3 Linguagem: Inglês

10.1088/0963-9659/3/3/013

1361-6617

Michele A. Forastiere, Giancarlo C. Righini,

Photonic and Optical Devices

Generalized Fresnel lenses with curved entrance diopters are investigated with the aim of checking which curvature produces the best correction from off-axis aberrations. The beam propagation method (BPM) is used to assess the performance of a waveguide Fresnel lens with given parameters (f number=4.6, delta n=0.0822 at lambda =830 nm): it is shown that the lenses having circular or parabolic front diopters (which almost coincide in the paraxial approximation) are corrected from third-order aberrations over a field of view of several degrees. The effect of chromatic aberration is also evaluated.