Optical performance of a versatile illumination system for high divergence LED sources

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• 作者：E. Rodr铆guez-Vidal ; D. Otaduy ; D. Ortiz ; F. Gonz谩lez ; F. Moreno ; J.M. Saiz
• 关键词：LED source ; Collimating system ; Optical design
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：March, 2014
• 年：2014
• 卷：125
• 期：5
• 页码：1657-1662
• 全文大小：1312 K

文摘

An efficient flat-top illuminating optical system optimized for an extended light source is presented. The source is a high-brightness high divergence light emitting diode (LED), sized 1 mm 脳 1 mm, producing monochromatic emission (525 卤 5 nm) with viewing angle of 130掳. The design is based on a rotationally symmetrical catadioptric system, developed on a geometrical optics basis, and modelled with ZEMAX^庐 software. The device consists of two optical systems: (i) a collimating system which, in turn, is formed by an aspheric lenses system (low numerical apertures, NA < 0.26) and two-mirror system (0.26 < NA < 0.86), and (ii) an external mirror (NA > 0.86) designed and optimized for each purpose. By itself, the collimating system works with a residual divergence of 胃_C = 1.46掳. The external mirror can be adequately designed to produce some given conditions. For instance, a flat-top profile is obtained in the selected focusing plane, with a maximum transversal intensity variation of 2.5% over 18 mm. In addition, when the focusing mirror is allowed to move along the optical axis in a 卤1 mm range, other interesting profiles can be reached for a given working distance, therefore increasing the versatility of the system.