In an embodiment, a scanning optical system comprises: first and second optical sources (22, 32) for providing first and second beams (18, 20), respectively, of optical radiation； a deflector device (42) disposed to receive and deflect the first and second beams, the deflector device configured for a scanning operation on a beam of radiation traversing the deflector device； wherein the first beam (18) is incident on the deflector device (42) with a first orientation and the second beam (20) is incident on the deflector device (42) with a second orientation that is different from the first orientation.
