Phosphor structures

A light source, comprising:

• a laser diode device comprising a gallium and nitrogen containing material, and configured as an excitation source;
• a wavelength conversion member configured as an emitter and optically coupled to the laser diode device, the wavelength conversion member comprising a dielectric element, a wavelength conversion element having voids, at least some of the voids on a surface of the wavelength conversion element adjacent to the dielectric element, and a transmissive element, wherein the dielectric element is disposed between the wavelength conversion element and the transmissive element, a refractive index of the dielectric element is lower than a refractive index of the wavelength conversion member, and solidified material from the dielectric element fills the voids on the surface and provides an interface with the transmissive element;
• an output facet of the laser diode device configured to output a laser beam of electromagnetic radiation, the electromagnetic radiation characterized by a wavelength range, a spectral width, a power, and a spatial configuration;
• a free space with a non-guided characteristic capable of transmitting the laser beam from the laser diode device to the wavelength conversion member;
• the wavelength conversion member configured to convert at least a fraction of the electromagnetic radiation in the laser beam with a first wavelength to a second wavelength that is longer than the first wavelength;
• and
• a transmission mode characterizing the wavelength conversion member with the laser diode device arranged so that the laser beam is incident on a first surface of the wavelength conversion member, the wavelength conversion member configured to emit a light from a second surface that is opposite the first surface, the light emission comprising a mixture of wavelengths characterized by at least the second wavelength from the wavelength conversion member.