English to Italian Tech/Engineering Patents apparatus for producing a three-dimensional work piece which includes a heating system

Si tratta del brevetto nella descrizione.
Nella parte della description trovo queste frasi:
EP 2 335 848 A1 relates to an optical irradiation unit which is provided for a plant for producing threedimensional workpieces by irradiating powder layers of a raw material powder with laser radiation.
A first laser beam is guided over a raw material powder layer applied to a support causing an input of heat into the raw material powder layer so that the individual particles of the raw material powder are melted or sintered together.
A second radiation source provides a second laser beam.
An optical splitting and/or coupling unit is designed to split the first laser beam into at least two laser sub-beams and/or to couple a second laser beam into the beam path of the first laser beam.

Trovo riferimenti solo in brevetti e non so come rendere... sottoraggi laser???
Grazie.