Reflective Diffuser for Reducing Laser Speckle and Reflective Luminescent Wheel Including Same
AssigneeMaterion Precision Optics (Shanghai) Limited
InventorsWEN BO ZHANG, XIAOHUA YANG
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Abstract
A diffuser for de-speckling laser light includes a transparent diffuser substrate with de-speckling microstructures disposed on or formed into a first (i.e. front) side thereof, and a reflective film coated onto an opposite second (i.e. back) side of the transparent diffuser substrate. An extinction layer may be coated onto the reflective film. An anti-reflection (AR) coating may be disposed on the first side of the transparent diffuser substrate. A luminescent wheel is also disclosed, including a disk and an optical ring secured to the disk so as to rotate with the disk. The optical ring includes at least one fluorescent segment and the aforementioned diffuser.
Claims21
A method of manufacturing a diffuser for de-speckling laser light, the method comprising:
- forming microstructures onto a front side of a transparent diffuser substrate which are configured to de-speckle the laser light;
- coating a back side of the transparent diffuser substrate with a reflective film, the back side of the transparent diffuser substrate disposed opposite from the front side;
- and
- depositing an extinction layer onto the reflective film, the extinction layer being configured to block the laser light,
- wherein an optical interface is defined at a junction of the back side of the transparent diffuser substrate and the reflective film which has a reflectivity of at least 96% for the laser light.
A method for assembling a luminescent wheel that includes at least one diffuser segment, the method comprising:
- connecting a motor to a disk to rotate the disk via the motor;
- providing an optical ring including at least one fluorescent segment and a diffuser segment;
- and
- securing the optical ring to the disk such that the optical ring rotates with the disk;
- wherein the at least one fluorescent segment is configured to convert laser light at an excitation wavelength to converted light;
- and
- wherein the diffuser segment comprises:
- a transparent diffuser substrate having a front side and a back side opposite the front side, wherein the transparent diffuser substrate is transparent for the laser light at the excitation wavelength;
- microstructures disposed on or formed into the front side of the transparent diffuser substrate and configured to de-speckle the laser light at the excitation wavelength;
- a reflective film coated directly onto the back side of the transparent diffuser substrate;
- and
- an extinction layer coated onto the reflective film and configured to block the laser light at the excitation wavelength,
- wherein an optical interface defined at a junction of the back side of the transparent diffuser substrate and the reflective film has a reflectivity of at least 96% for the laser light at the excitation wavelength.
Dependencies are inferred from the claim text.