Laser-phosphor based stage-lighting fixture providing CTT control

A light generating system comprising a first light generating arrangement, a luminescent body, a reflective polarizer, and a control system;

• wherein:
• the first light generating arrangement is configured to generate pump light having a controllable polarization, wherein the polarization is controllable between a first polarization and a second polarization;
• wherein the first light generating arrangement comprises a first solid state light source selected from the group comprising a superluminescent diode and a laser diode;
• the luminescent body is configured downstream of the first light generating arrangement and, during operation of the light generating system, the pump light generated by the first light generating arrangement is incident on the luminescent body;
• the luminescent body comprises a luminescent material;
• wherein the luminescent body is configured to transmit at least part of the pump light and convert at least part of the pump light into luminescent material light;
• the reflective polarizer is configured downstream of the luminescent body;
• wherein the reflective polarizer is transmissive for at least part of the luminescent material light;
• wherein the reflective polarizer has a higher transmission for the pump light comprising the first polarization than for the pump light comprising the second polarization, wherein the reflective polarizer has a lower reflectivity for the pump light comprising the first polarization than for the pump light comprising the second polarization;
• the light generating system is configured to generate system light;
• the system light is white light having a correlated color temperature in a range from 1800 K to 10000 K and a color rendering index of at least 70;
• the control system is configured to control spectral properties of the system light by controlling the polarization of the pump light;
• in a first operational mode of the light generating system the system light comprises a first radiant flux ratio X1/Y1 of the pump light and the luminescent material light, wherein in a second operational mode of the light generating system the system light comprises a second radiant flux ratio X2/Y2 of the pump light and the luminescent material light, and wherein X1/Y1>X2/Y2;
• and
• wherein the luminescent body is at least partially transparent for the pump light.