Optimum Focal Length Range For Thin-Lenses Optical Arrays Having Spatial Integration Feature | ||||
| Egyptian Journal of Solids | ||||
| Article 4, Volume 27, Issue 1, 2004, Page 35-51 PDF (564.78 K) | ||||
| DOI: 10.21608/ejs.2004.149308 | ||||
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| Abstract | ||||
| A simple realization of a spatial integrator array is constructed by using individual units composed of two thin lenses. The spatial integration feature depends on the value of the focal distance of one of the lens. This focal length and its relation with the thickness of the individual element are related with the lateral magnification defining the synthetic image given by the array. Although the focal length of the other lens can be arbitrarily selected, we have analyzed the optimum range of focal distances that increases the amount of energy falling on the synthetic image. This analysis has been done for spatial integrator arrays having spherical dome configuration and planar configuration. Numerical analysis of the behavior of the optimized units, performed in a meredional plane, is presented. The level the total irradiance reaching the synthetic image plane and the uniformity of the irradiance distribution on it have been measured. The coefficient of uniformity as well as the image width have been evaluated and compered. The results clearly demonstrate that the performance of the optimized unit is largely improved relative to the non-optimized one. The study has been done both in the paraxial range and by using real ray-tracing tools. Comparison of the paraxial calculation of the spatial integrator array and those obtained by real raytracing enables the practical choice of the upper limits of the focal length range in order to avoid aberrations effects and significant deviation from the paraxial behavior situation. | ||||
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