A LIGHT TREATMENT DEVICE

According to an aspect, there is provided a treatment device (2; 30; 60; 130) for performing light-based treatment operations on or to a subject. The treatment device (2; 30; 60; 130) comprises a light source (12) for generating light for performing the treatment operation; a dichroic filter (34; 64; 104; 134) arranged at a first angle with respect to the incident light such that the incident light is separated into a transmitted light component and a reflected light component according to a cut-off wavelength of the dichroic filter (34; 64; 104; 134), wherein the transmitted light component is transmitted through the dichroic filter (34; 64; 104; 134) and the reflected light component is reflected by the dichroic filter (34; 64; 104; 134); a light exit window (10) through which a light component is emitted from the treatment device (2; 30; 60; 130); a beam dump (44; 74; 140) configured to absorb a light component; and a heat sink (46; 76; 142) coupled to the beam dump (44; 74; 140) to dissipate heat from the beam dump (44; 74; 140). The light exit window (10) and beam dump (44; 74; 140) are arranged with respect to the dichroic filter (34; 64; 104; 134) such that one of the transmitted light component and the reflected light component is emitted from the treatment device (2; 30; 60; 130) via the light exit window (10) and the other one of the transmitted light component and reflected light component is incident on the beam dump (44; 74; 140). The dichroic filter (34; 64; 104; 134) is provided on a first surface of a solid dichroic prism (38; 68) or an internal surface in a solid dichroic cuboid. Selon un aspect, l'invention concerne un dispositif de traitement (2 ; 30 ; 60 ; 130) destiné à effectuer des opérations de traitement à base de lumière sur ou à un sujet. Le dispositif de traitement (2 ; 30 ; 60 ; 130) comprend une source de lumière (12) destinée à générer de la lumière pour effectuer l'opération de traitement ; un filtre dichroïque (34 ; 64 ; 104 ; 134) disposé à un premier angle par rapport à la lumière incidente, de sorte que la lumière incidente est séparée en une composante de lumière transmise et une composante de lumière réfléchie en fonction d'une longueur d'onde de coupure du filtre dichroïque (34 ; 64 ; 104 ; 134), la composante de lumière transmise étant transmise à travers le filtre dichroïque (34 ; 64 ; 104 ; 134) et la composante de lumière réfléchie étant réfléchie par le filtre dichroïque (34 ; 64 ; 104 ; 134) ; une fenêtre de sor