A temperature-controlled laser sintering system includes a laser beam 12 which is focussed onto a sintering bed 38 by a focussing mirror 26 and a set of scanning mirrors 32, 34. Thermal radiation 114 emitted from the sintering bed 38 are imaged to the scanning mirrors and to a dichroic beamsplitter 110...http://www.google.com/patents/US5530221?utm_source=gb-gplus-sharePatent US5530221 - Apparatus for temperature controlled laser sintering
