An infrared-laser source device provided with an external housing, said external housing comprising: a light output interface arranged in a front part of the external housing, at least one infrared-laser source arranged in a rear part of the external housing and configured to emit an IR-laser beam providing a first emitting area at the light output interface, and a first light distributing element configured to diverge light at the light output interface, wherein said infrared-laser source device further comprises a second light distributing element separated from the first light distributing element and providing, at the light output interface, a second emitting area larger than the first emitting area.