منابع مشابه
Two-dimensional nonlinear beam shaping.
We develop a technique for two-dimensional arbitrary wavefront shaping in quadratic nonlinear crystals by using binary nonlinear computer generated holograms. The method is based on transverse illumination of a binary modulated nonlinear photonic crystal, where the phase matching is partially satisfied through the nonlinear Raman-Nath process. We demonstrate the method experimentally showing a ...
متن کاملBeam shaping using genetically optimized two-dimensional photonic crystals.
We propose the use of two-dimensional (2D) photonic crystals (PhCs) with engineered defects for the generation of an arbitrary-profile beam from a focused input beam. The cylindrical harmonics expansion of complex-source beams is derived and used to compute the scattered wave function of a 2D PhC via the multiple scattering method. The beam shaping problem is then solved using a genetic algorit...
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We report one-dimensional (1-D) parabolic-beam photonic crystal (PhC) lasers in which the width of the PhC slab waveguide is parabolically tapered. A few high-Q resonant modes are confirmed in the vicinity of the tapered region where Gaussian-shaped photonic well is formed. These resonant modes originate from the dielectric PhC guided mode and overlap with the gain medium efficiently. It is als...
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A beam shaping method is presented where a diffractive optical element (DOE) is designed by optimizing the complex mode coefficient weights of a set of Gaussian beam modes. This method is compared with the more standard unidirectional approach. Differential evolution is used for the optimization in both the unidirectional and Gaussian beam mode optimization methods. For the particular transform...
متن کاملBeam Shaping for Phase Singularities
In this paper we are molding the phase profile of a Gaussian beam in order to achieve a phase singularity called optical vortex. For this purpose, we apply the beam shaping technique for a 635 nm wavelength radiation using a diffractive optical element with high diffractive efficiency. We use reflective spiral phase plates and fork-like computer generated holograms, fabricated with photolithogr...
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ژورنال
عنوان ژورنال: Journal of the Optical Society of America A
سال: 1995
ISSN: 1084-7529,1520-8532
DOI: 10.1364/josaa.12.001702