Light conversion modules having a laser diode light conversion assembly and long pass filter reflecting light back to the light conversion assembly
View Patent ↗The present disclosure describes light conversion modules each having a single laser diode or multiple laser diodes. The light conversion modules can be particularly small in size (height and lateral footprint) and can overcome various challenges associated with the high optical power and heat emitted by laser diodes. In some implementations, the light conversion modules include glass phosphors, which, in some instances, can resist degradation caused by the optical power and/or heat generated by the laser diodes. In some instances, the light conversion modules include optical filters which, in some instances, can reduce or eliminate human eye-safety risk.
1. A light conversion module operable to generate a directed light emission comprising:
a laser diode operable to generate a light emission of a particular wavelength or range of wavelengths;
a light conversion assembly including a holder, an optically active surface, a light conversion material within the holder, the laser diode being disposed such that the light emission illuminates the light conversion material within the holder, wherein the light conversion material is operable to convert at least some of the light emission to a converted light emission, the optically active surface being diffusive and/or reflective and being operable to diffusively and/or spectrally reflect the light emission and the converted light emission;
a filter; and
an optical assembly;
wherein the filter is arranged so as to allow the converted light emission to pass to the optical assembly, and is arranged such that at least some of an unconverted portion of the light emission is reflected back to the light conversion assembly,
the optical assembly including a refractive and/or diffractive lens element, the optical assembly being operable to direct the converted light emission over a particular field-of-illumination thereby generating the directed light emission.
2. The light conversion module as in claim 1 wherein the optical filter is operable to pass wavelengths of light greater than a wavelength of the light emission.
3. The light conversion module as in claim 2 wherein the optical filter is operable to reflect wavelengths of light having a wavelength of light equal to or less than that of the light emission.
4. The light conversion module as in claim 3 wherein the optical filter is operable to reflect wavelengths of light having a wavelength of light equal to or less than that of the light emission back toward the light conversion assembly.
5. The light conversion module as in claim 4 configured such that at least some of the reflected light is recycled by the light conversion assembly.
6. A light conversion module operable to generate a directed light emission comprising:
a laser diode operable to generate a light emission of a particular wavelength or range of wavelengths;
a light conversion assembly including a holder, an optically active surface, a light conversion material, the laser diode being disposed such that the light emission illuminates the light conversion material, wherein the light conversion material is operable to convert at least some of the light emission to a converted light emission, the optically active surface being diffusive and/or reflective and being operable to diffusively and/or spectrally reflect the light emission and the converted light emission;
a filter; and
an optical assembly;
wherein the filter is arranged so as to allow the converted light emission to pass to the optical assembly, and is arranged such that at least some of an unconverted portion of the light emission is reflected back to the light conversion assembly,
the optical assembly including a refractive and/or diffractive lens element, the optical assembly being operable to direct the converted light emission over a particular field-of-illumination thereby generating the directed light emission.
7. The light conversion module as in claim 6 wherein the optical filter is operable to pass wavelengths of light greater than a wavelength of the light emission.
8. The light conversion module as in claim 7 wherein the optical filter is operable to reflect wavelengths of light having the wavelength of light equal to or less than that of the light emission.
9. The light conversion module as in claim 8 wherein the optical filter is operable to reflect wavelengths of light having a wavelength of light equal to or less than that of the light emission back toward the light conversion assembly.
10. The light conversion module as in claim 9 configured such that at least some of the reflected light is recycled by the light conversion assembly.