17 May 2016 Design method for a laser line beam shaper of a general 1D angular power distribution
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Laser line is a beam of laser, spanned in one direction using a beam shaper to form a fan of light. This illumination tool is important in laser aided machine vision, 3D scanners, and remote sensing. For some applications the laser line should have a specific angular power distribution. If the distribution is nonsymmetrical, the beam shaper is required to be nonsymmetrical freeform, and its design process using optical design software is time consuming due to the long optimization process which usually converges to some local minimum. In this paper we introduce a new design method of a single element refractive beam shaper of any predefined general 1D angular power distribution. The method makes use of a notion of "prism space", a geometrical representation of all double refraction prisms, and any 1D beam shaper can be described by a continuous curve in this space. It is shown that infinitely many different designs are possible for any given power distribution, and it is explained how an optimal design is selected among them, based on criteria such as high transmission, low surface slopes, robustness to manufacturing errors etc. The method is non-parametric and hence does not require initial guess of a functional form, and the resultant optical surfaces are described by a sequence of points, rather than by an analytic function.
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E. Oved, E. Oved, A. Oved, A. Oved, "Design method for a laser line beam shaper of a general 1D angular power distribution", Proc. SPIE 9822, Advanced Optics for Defense Applications: UV through LWIR, 98220J (17 May 2016); doi: 10.1117/12.2225423; https://doi.org/10.1117/12.2225423


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