A light converting device comprising: - a light converter, wherein the light converter is adapted to convert laser light to converted light, wherein a peak emission wavelength of the converted light is in a longer wavelength range than a laser peak emission wavelength of the laser light, wherein the light converter comprises a light entrance surface, a bonding surface opposite to the light entrance surface and a side surface; - a substrate comprising a reflective structure, wherein the light converter is arranged on the substrate for reflecting laser light and converted light by means of the reflective structure; - a reflective side structure which is optically coupled to the side surface of the light converter for reflecting laser light and converted light by means of the reflective side structure, wherein the reflective side structure comprises a matrix material which is transparent in the wavelength range of the laser light and the wavelength range of the converted light, wherein the matrix material comprises reflective particles dispersed in the matrix material, wherein the reflective particles are reflective in the wavelength range of the laser light and the wavelength range of the converted light, wherein the matrix material is disposed on the side surface of the light converter; and - a cooling element attached to the reflective side structure for cooling the reflective side structure, wherein the cooling element comprises material which is transparent in the wavelength range of the laser light and the wavelength range of the converted light, and wherein the cooling element is arranged in an optical path of the laser light, an optical path of reflected laser light and an optical path of the converted light, and - a decoupling structure, wherein the decoupling structure is arranged between the light converter and the cooling element, and wherein the decoupling structure is arranged to avoid light guiding of the reflected laser light and the converted light in the cooling element. - a light converter, wherein the light converter is adapted to convert laser light to converted light, wherein a peak emission wavelength of the converted light is in a longer wavelength range than a laser peak emission wavelength of the laser light, wherein the light converter comprises a light entrance surface, a bonding surface opposite to the light entrance surface and a side surface; - a substrate comprising a reflective structure, wherein the light converter is arranged on the substrate for reflecting laser light and converted light by means of the reflective structure; - a reflective side structure which is optically coupled to the side surface of the light converter for reflecting laser light and converted light by means of the reflective side structure, wherein the reflective side structure comprises a matrix material which is transparent in the wavelength range of the laser light and the wavelength range of the converted light, wherein the matrix material comprises reflective particles dispersed in the matrix material, wherein the reflective particles are reflective in the wavelength range of the laser light and the wavelength range of the converted light, wherein the matrix material is disposed on the side surface of the light converter; and - a cooling element attached to the reflective side structure for cooling the reflective side structure, wherein the cooling element comprises material which is transparent in the wavelength range of the laser light and the wavelength range of the converted light, and wherein the cooling element is arranged in an optical path of the laser light, an optical path of reflected laser light and an optical path of the converted light, and - a decoupling structure, wherein the decoupling structure is arranged between the light converter and the cooling element, and wherein the decoupling structure is arranged to avoid light guiding of the reflected laser light and the converted light in the cooling element.