| 摘要 |
A beam of radiation having high power typically has an intensity cross-sectional distribution which varies considerably in the radial an azimuthal directions. The apparatus disclosed is adapted for rotating a beam of radiation to obtain azimuthal and radial time averaging of the intensity distribution incident onto a workpiece. The apparatus includes a housing (10) adapted for rotation about a centerline axis (14), an entrance port (18) and an exit port (22) adapted for transmitting a beam of radiation through the housing, an inverter (44) disposed within an internal passage (24) within the housing and fixedly attached to the housing for rotation therewith includes a first mirror (46) having a reflective surface (50) angularly disposed to the rotation axis adapted for reflecting radiation incident thereon to a second minor (54), a second minor having a reflective surface (58) adapted for reflecting radiation incident thereon to a third mirror (62) having a reflective surface (60) angularly disposed to the rotation axis adapted for passing radiation incident thereon through the exit port. Radiation passing through the housing is rotated about its propagation axis at an angular frequency twice the angular rotation rate of the housing. The effect of spikes, hot spots, or the like in the intensity distribution are effectively time averaged over an interaction area on a workpiece when the rotation frequency is greater than the characteristic response time of the material of the workpiece. |
