Folded integrator rod device

A device 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,
• wherein the plurality of integrator rods comprises the first integrator rod, the last integrator rod, and an integrator rod between the first integrator rod and the last integrator rod, the integrator rod between the first integrator rod and the last integrator rod comprising:
• a first optical coupling end and a second optical coupling end, the first optical coupling end configured to receive the light from the first integrator rod and reflect the light towards the second optical coupling end, the second optical coupling end configured to receive the light from the first optical coupling end and reflect the light towards the last integrator rod.

A device 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,
• wherein a subset of the plurality of integrator rods located between the first integrator rod and the last integrator rod in the series each include a first optical coupling end and a second optical coupling end, the first optical coupling end configured to receive the light from the previous adjacent integrator rod and reflect the light towards the second optical coupling end, the second optical coupling end configured to receive the light from the first optical coupling end and reflect the light towards a next adjacent integrator rod in the series.