Formulating the design of two freeform lens surfaces for point-like light sources.

Two freeform surfaces provide more degrees of freedom in designing illumination optics and can yield a better solution. The existing methods for point-like sources are mostly valid in designing one freeform surface. Designing two freeform surfaces for point-like sources still remains a challenging issue. In this Letter, we develop a general formulation of designing two freeform lens surfaces for point-like sources. The proposed method is very robust in designing freeform lenses with two elaborately designed surfaces. The examples clearly show that using two freeform surfaces yields better solutions to challenging illumination problems with ultra-high energy efficiency.

[1]  Vladimir Oliker,et al.  Controlling light with freeform multifocal lens designed with supporting quadric method(SQM). , 2017, Optics express.

[2]  Guofan Jin,et al.  Design method of surface contour for a freeform lens with wide linear field-of-view. , 2013, Optics express.

[3]  Julio Chaves,et al.  Simultaneous multiple surface optical design method in three dimensions , 2004 .

[4]  Jannick P Rolland,et al.  Fast freeform reflector generation usingsource-target maps. , 2010, Optics express.

[5]  Xu Liu,et al.  Freeform LED lens for uniform illumination. , 2008, Optics express.

[6]  Jochen Stollenwerk,et al.  Algorithm for irradiance tailoring using multiple freeform optical surfaces. , 2012, Optics express.

[7]  Brittany D. Froese,et al.  Freeform illumination optics construction following an optimal transport map. , 2016, Applied optics.

[8]  Ivan Moreno,et al.  Creating a desired lighting pattern with an LED array , 2008, Optical Engineering + Applications.

[9]  Juan C. Miñano,et al.  Free-form optics for illumination , 2009 .

[10]  Jochen Stollenwerk,et al.  High resolution irradiance tailoring using multiple freeform surfaces. , 2013, Optics express.

[11]  Xu Liu,et al.  Freeform illumination design: a nonlinear boundary problem for the elliptic Monge-Ampére equation. , 2013, Optics letters.

[12]  K. Thompson,et al.  Freeform spectrometer enabling increased compactness , 2017, Light: Science & Applications.

[13]  Leonid L Doskolovich,et al.  Design of LED refractive optics with predetermined balance of ray deflection angles between inner and outer surfaces. , 2015, Optics express.