Described examples include a beam spreader having a first beam splitter arranged to receive light from a light source, the first beam splitter arranged to pass a first portion of the light in a first direction and reflect a second portion of the light; a second beam splitter arranged to receive the second portion of the light and reflect a third portion of the light in a second direction parallel to the first direction and arranged to pass a fourth portion of the light; and a mirror arranged to receive the fourth portion of the light and reflect the fourth portion of the light in a third direction parallel to the first direction, wherein the third portion and the fourth portion of the light reflected from the mirror is separated from the first portion of the light in the spreading direction.