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