Non-imaging freeform optical device for use in a high concentration photovoltaic device

A method for designing a non-imaging freeform optical device for use in a high concentration photovoltaic device, the method comprising:

• identifying a concentration region relative the non-imaging freeform optical device for concentrating incident light from the non-imaging freeform optical device;
• initiating a first ray from a first edge of the concentration region toward a predetermined point on the non-imaging freeform optical device using a ray-tracing model;
• redirecting the first ray toward a first wavefront;
• initiating a second ray from a second wavefront that impinges on the predetermined point offset from an angular impingement of the first wavefront at the predetermined point by an angular view of a sun;
• redirecting the second ray from the non-imaging freeform optical device to a second edge of the non-imaging freeform optical device;
• and
• calculating a surface normal at the predetermined point for the non-imaging freeform optical device such that the first and second wavefronts are redirected to a surface of the non-imaging freeform optical device.