Light source system and laser projection display device

A laser projection display device, comprising;

• a projection objective lens;
• and
• a light source system, comprising:
• one or more infrared laser light sources, wherein each of the one or more infrared laser light sources is a pump light source;
• and
• a nonlinear optical crystal array that comprises one or more nonlinear optical crystals, wherein each nonlinear crystal is configured to output a single-mode Gaussian beam, wherein an output end of the nonlinear optical crystal array outputs a coaxial visible Gaussian laser beam, wherein the coaxial visible Gaussian laser beam has a round spot which increase projection display resolution, wherein an input end of the nonlinear optical crystal array is connected to an output end of the one or more infrared laser light sources, wherein the coaxial visible Gaussian laser beam provides a light source for laser projection display;
• wherein the nonlinear optical crystal array is configured to:
• perform frequency conversion on an infrared laser generated by the one or more infrared laser light sources, and
• output a laser obtained after the frequency conversion,;
• wherein an output end of the light source system is connected to the projection objective lens, and wherein the projection objective lens is configured to transmit, to a projection display screen, a coaxial visible Gaussian laser beam output by the light source system.