Lighting assembly and method for providing measuring light and optical measuring device

A chromatic confocal measuring device for determining one or more properties of a surface of an object, the chromatic confocal measuring device comprising a lighting assembly, which comprises:

• an aperture component comprising a first and opposite second side, the aperture component defining at least one orifice;
• at least one pump light source to provide pump light;
• and
• a photoluminescent component located on the second side of the aperture component for converting pump light receivable from the first side of the aperture component through the at least one orifice to the second side of the aperture component onto the photoluminescent component from the at least one pump light source into polychromatic measuring light,
• wherein part of the polychromatic measuring light is allowed to pass the aperture component through the at least one orifice to provide measuring light to the first side of the aperture component,
• wherein the pump light source being located on the first side of the aperture component;
• wherein the at least one orifice comprises a slit-shaped orifice or a plurality of punctiform orifices.