So far, illumination optics design for extended sources (like LEDs) has been mainly treated as perturbations of ideal point without any extent. Such approaches work well provided that this case is approximately met. However, the demand very compact luminaires equipped with modern high-brightness LEDs results in configurations where actual size cannot be ignored. Here, we develop a “wavefront tailoring” method producing prescribed patterns while fully encompassing source size. We combine...

Multi-chip and large size LEDs dominate the lighting market in developed countries these days. Nevertheless, a general optical design method to create prescribed intensity patterns for this type of extended sources does not exist. We present strategy which source target pattern are described by means "edge wavefronts" system. The goal is then finding an optic coupling wavefronts, current work monolithic part comprising up three freeform surfaces calculated with simultaneous multiple surface...

We present a compact freeform optic, called "Freeform Shell-Mixer", which, when placed on top of multicolor light source (particularly, multi-chip LED), turns it into virtual in which colors are uniformly mixed. The compatible with injection molding, makes use étendue-conserving Köhler integration to provide homogeneous mixing light. Its minimal size (just 2x larger than the source) concept many luminaries, as ray tracing models show. Simulations indicate that Freeform Shell-Mixer can reach...

We present the design and fabrication of a multicomponent optical system for LiDAR applications. The comprises four stages: commercial cylindrical lens, custom freeform trilobe set three reflective diffraction gratings, monolithic array nine mirrors. This set-up is coupled to an on-chip linear Optical Phase Array (OPA): combination beam steering provided by OPA, orthogonal achieved gratings results in scan over directions 3D. All components have been designed fabricated at VUB B-PHOT's...

We present an example of design, tolerancing and fabrication freeform plastic lightguides for optical sensing applications. The design the relies on Nonimaging Optics principles uses raytracing simulations analysis optimization. examine influence parameters simulated performance show ways to minimize their impact. presented have been fabricated at Photonics Innovation Center VUB – B-PHOT.

Uniform illumination, including uniform irradiance and color uniformity, is of indispensable importance for numerous imaging sensing applications. These illumination designs typically comprise one or multiple light-emitting diodes (LEDs), feature halogen sources, which are preferred spectroscopy We present an overview different design strategies enabling a taking the extended source characteristics into account, while aiming to compare optical approaches with respect cost, efficiency,...

We present the development of a compact (about 1.3 × 2.0 20 mm3) freeform optical lightguide for sensing applications, from conceptual design to fabrication through injection molding. The optic is based on flow-line method Nonimaging Optics, which allows desired functionalities (45° half-acceptance and 40° beam steering) while meeting particularly tight mechanical geometrical constraints. An extensive analysis effects parameters performances demonstrates importance minimizing fillet radius....

Today's SSL illumination market shows a clear trend to high flux packages with higher efficiency and CRI, realized by means of multiple color chips phosphors. Such light sources require the optics provide both near- far-field mixing. This design problem is particularly challenging for collimated luminaries, since traditional diffusers cannot be employed without enlarging exit aperture reducing brightness. Furthermore, compromise output ratio (efficiency) lamps which they are applied. A...

The so-called CCS4FK is an ultra-flat photovoltaic system of high concentration and efficiency, with potential to convert, ideally, the equivalent a 45% direct solar radiation into electricity by optimizing usage sun spectrum collecting part diffuse radiation, as flat plate does. LPI has recently finished design based on this concept now developing prototype technology, thanks support FUNDACION REPSOL-Fondo de Emprendedores, which promotes entrepreneur projects in different areas linked...

The outdoor measurements of both a single-cell and 4-cell CPV modules reaching, respectively, maximum peak efficiencies 36.0% 34.8% (both corrected @Tcell=25°C) are presented. This is the result joint effort by LPI Solar Junction to demonstrate potential combining their respective state-of-the-art concentrator optics solar cells. used Fresnel Köhler(FK), which an advanced nonimaging using 4-channel Köhler homogenization, based on primary lens free-form secondary glass lens. Junction's cell...

Placing a plane mirror between the primary lens and receiver in Fresnel Köhler (FK) concentrator gives birth to quite different CPV system where all high-tech components sit on common plane, that of panels. The idea enables not only thinner device (a half original) but also low cost 1-step manufacturing process for optics, automatic alignment secondary lenses, cell/wiring protection. concept is compatible with two techniques increase module efficiency: spectrum splitting 3J BPC Silicon cell...

Today's SSL illumination market shows a clear trend towards high flux packages with higher efficiency and CRI, realized by means of multiple color chips phosphors. Such light sources require the optics to provide both near- far-field mixing. This design problem is particularly challenging for collimated luminaries, since traditional diffusers cannot be employed without enlarging exit aperture reducing brightness (so increasing étendue). Furthermore, compromise output ratio (efficiency) lamps...

There is currently a desire to produce thinner LED backlights and frontlights so that the devices which use these components can be as thin lightweight possible. This particularly true for smartphones tablets both of make extensive such components. The push may lead situations in are than height emitting area. paper deals with coupling LEDs light guides, describing some possible ways efficiently inject from relatively large into backlight. These solutions étendue-squeezing optics, linear...

The Freeform RXI collimator is a remarkable example of advanced nonimaging device designed with the 3D Simultaneous Multiple Surface (SMS) Method. In original design, two (the front refracting surface and back mirror) three optical surfaces are calculated simultaneously one cavity surrounding source) fixed by designer. As result, perfectly couples input wavefronts (coming from edges extended LED output (defining beam). This allows for lamps able to produce controlled intensity distributions,...

Freeform surfaces are important in designing state-of-the-art nonimaging optics for high efficiency concentration phototovoltaics (CPV). CPV designs will be presented that use freeform and thin-film optical components with the potential to achieve 45% electrical conversion.

One of the most interesting problems in illumination research community is design optics able to generate prescribed intensity patterns with extended input sources. Such would be ideally applied current generation extended, high-brightness, high-CRI LEDs used general illumination, allowing reduced size luminaires and improved efficiency. But 3D, for non-symmetric configurations, how using sources remains an open question. We present alternative approach this problem, case Lambertian sources,...

We present a method to associate wavefronts given intensity pattern. This “wavefront-tailoring” technique is at the core of powerful wavefront-coupling design tool, particularly suited for freeform illumination optics with extended source.

We present a miniature freeform lightguide for sensing applications, designed according to the principles of flow-line method from Nonimaging Optics. The optic is obtained by combining two 2D concentrators in curved monolithic piece, achieving 45° half-acceptance angle and 40° beam steering very compact volume (about 1.3 x 2.0 20 mm³). show how initial design has been adjusted after thorough tolerance analysis describe its fabrication through plastic injection molding. mold...

We present a freeform lightguide comprising two 2D flow-line concentrators to achieve 45° acceptance angle in 3D, under particularly strict mechanical constraints. The design has been optimized for injection molding fabrication.