High quality white laser-based light source by indirect pumping of red phosphor

A lighting device comprising:

• a first light source configured to generate first light source light, having a first light source light spectral power distribution, wherein the first light source comprises a laser light source, and wherein the first light source light has an optical axis;
• a first converter material, comprising a first luminescent material, configured to convert at least part of the first light source light into first luminescent material light having a first luminescent material light spectral power distribution, wherein the first luminescent material light has one or more wavelengths in the green and/or yellow wavelength range;
• a second converter material, comprising a second luminescent material, configured to convert one or more of (i) part of the first luminescent material light and (ii) part of the first light source light into second luminescent material light having a second luminescent material light spectral power distribution different from the first luminescent material light spectral power distribution, wherein the second luminescent material light has one or more wavelengths in the orange and/or red wavelength range;
• wherein the first light source, the first converter material, and the second converter material are configured such that first light source light can only reach the second converter material after scattering via the first converter material;
• wherein the optical axis is incident on the first converter material and is not incident on the second converter material;
• and
• a first thermally conductive element in thermal contact with at least part of the second luminescent material,
• wherein the first thermally conductive element at least partly encloses the first converter material and the second converter material, wherein the first thermally conductive element comprises a window, wherein the window comprises one or more of a light transmissive material and an opening, wherein the first light source is configured upstream of the window and wherein the first converter material is configured downstream of the window.