Light frequency up-conversion of laser light, for producing green or yellow light

A luminaire, comprising:

• a first light source including one or more solid state emitters, configured to emit light of dominant wavelengths in two separate wavelength ranges of a visible spectrum;
• a second light source configured to emit green or yellow light in a third wavelength range between the two separate wavelength ranges of the visible spectrum, wherein the second light source comprises:
• a solid state laser emitter configured to emit laser light having a dominant wavelength in an infrared range, and
• a light frequency up-converter including a nonlinear metamaterial, coupled to convert the laser light emitted by the solid state laser emitter to green or yellow light having a dominant wavelength in the third wavelength range, wherein the nonlinear metamaterial is a type of metamaterial configured to exhibit:
• resonance for an infrared frequency of the laser light in the infrared range from the solid state laser emitter and resonance for a harmonic frequency of the green or yellow light of a second or higher order harmonic,
• substantial mode overlap between the infrared frequency of the laser light in the infrared range from the solid state laser emitter and the harmonic frequency of the green or yellow light of the second or higher order harmonic, and
• intrinsic nonlinear material or phase matching;
• and
• the luminaire having a secondary optic that includes a diffuser optically coupled to the first light source and the light frequency up-converter to emit a combined light output of a combination of light in the two separate wavelength ranges from the first light source and the green or yellow light from the light frequency up-converter to distribute the combination of light from the first light source and the light frequency up-converter for artificial illumination lighting of a space.