Abstract: A folded integrator rod device is provided comprising: a plurality of integrator rods that are substantially parallel and arranged adjacent to each other in a series in a substantially perpendicular direction to longitudinal axes thereof, pairs of adjacent integrator rods in the series being optically coupled at respective optical coupling ends via total internal reflection, a respective cross-section of each of the plurality of integrator rods, other than a first integrator rod, being larger than the respective cross-section of a previous adjacent integrator rod in the series, the first integrator rod in the series comprising a light entrance face configured to receive light, the light entrance face opposite an optical coupling end of the first integrator rod, and a last integrator rod in the series comprising a light exit face configured to emit the light, the light exit face opposite a respective optical coupling end of the last integrator rod.

Abstract: A folded integrator rod device is provided comprising: a plurality of integrator rods that are substantially parallel and arranged adjacent to each other in a series in a substantially perpendicular direction to longitudinal axes thereof, pairs of adjacent integrator rods in the series being optically coupled at respective optical coupling ends via total internal reflection, a respective cross-section of each of the plurality of integrator rods, other than a first integrator rod, being larger than the respective cross-section of a previous adjacent integrator rod in the series, the first integrator rod in the series comprising a light entrance face configured to receive light, the light entrance face opposite an optical coupling end of the first integrator rod, and a last integrator rod in the series comprising a light exit face configured to emit the light, the light exit face opposite a respective optical coupling end of the last integrator rod.