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Three dimensional optical structures are described that can have various integrations between optical devices within and between layers of the optical structure. Optical turning elements can provide optical pathways between layers of optical devices. Methods are described that provide for great vers

Three dimensional optical structures are described that can have various integrations between optical devices within and between layers of the optical structure. Optical turning elements can provide optical pathways between layers of optical devices. Methods are described that provide for great versatility on contouring optical materials throughout the optical structure. Various new optical devices are enabled by the improved optical processing approaches.

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1. A method for forming a patterned coating on a surface, the method being performed in a reaction chamber isolated from the ambient atmosphere and comprising: a) reacting a first reactant flow with a radiation beam to form a first set of inorganic product particles in a first product particle strea

1. A method for forming a patterned coating on a surface, the method being performed in a reaction chamber isolated from the ambient atmosphere and comprising: a) reacting a first reactant flow with a radiation beam to form a first set of inorganic product particles in a first product particle stream, the product particles therein being less than about 500 nm in average diameter and having a temperature; andb) directing the first product particle stream through a first discrete mask at a surface to form the patterned coating on the surface in a deposition process, the first discrete mask adjacent the surface but not being bonded to the surface, wherein the first discrete mask and the surface move together relative to the first product particle stream to deposit the patterned coating, wherein the patterned coating comprises product particles that are fused to each other at the point of deposition during the deposition process due to the temperature of the product particles upon exit from the radiation beam allowing the particles to fuse upon contacting each other at the point of deposition during the deposition process. 2. The method of claim 1 wherein the radiation beam is a light beam and wherein the first reactant flow intersects the light beam to form a reaction zone at which the first product particle stream is formed wherein the light beam does not intersect the surface. 3. The method of claim 2 wherein the radiation beam is generated by an infrared laser. 4. The method of claim 1 wherein the first reactant flow is formed by an inlet nozzle having an inlet opening that is elongated in a first dimension relative to a second dimension that is orthogonal to the first dimension. 5. The method of claim 4 wherein the inlet nozzle has the inlet opening with an aspect ratio of the first elongated dimension to the second dimension that is orthogonal to the first dimension of at least about 5. 6. The method of claim 4 wherein the elongated first dimension of the inlet nozzle is longer than a width of the surface such that the patterned coating is formed on the entire surface with one linear pass of the surface through the first product particle stream. 7. The method of claim 1 wherein the first reactant flow comprises vapor and/or gas precursors of the first set of product particles. 8. The method of claim 1 wherein the first reactant flow comprises aerosol precursors of the first set of product particles. 9. The method of claim 1 wherein the first reactant flow comprises a silicon precursor. 10. The method of claim 9 wherein the first reactant flow comprises a dopant precursor. 11. The method of claim 1 wherein the patterned coating consolidates into an optical material comprising a glass. 12. The method of claim 1 wherein the patterned coating consolidates into an optical material comprising a crystalline material. 13. The method of claim 1 wherein the first discrete mask comprises a sheet with a plurality of cut-outs through which the first product particle stream passes to form the patterned coating. 14. The method of claim 1 further comprising removing the first discrete mask to leave the patterned coating separate from the first discrete mask. 15. The method of claim 14 further comprising: a) placing a second discrete mask adjacent the surface;b) reacting a second reactant flow to form a second set of product particles in a second product particle stream wherein the second set of product particles, when the second discrete mask is located adjacent the surface, are different from the first set of product particles when the first discrete mask is located adjacent the surface; andc) directing the second product particle stream through the second discrete mask at a surface to form an additional patterned coating on the surface, the second discrete mask not being bonded to the surface. 16. A method for forming a patterned coating on a surface with varying composition areas at different locations along the surface, the method being performed in a reaction chamber isolated from the ambient atmosphere and comprising: a) reacting a reactant stream with a radiation beam to form a product particle stream, the product articles being less about 500 nm in average diameter and having a temperature; andb) directing the product particle stream comprising inorganic product particles at the surface in a coating processwherein the patterned coating comprises product particles fused to each other at the point of deposition during the coating process due to the temperature of the product particles upon exit from the radiation beam allowing the particles to fuse upon contacting each other at the point of deposition during the desposition process,wherein the product particle stream sequentially coats portions of the surfacewherein a discrete mask comprising an opening adjacent the surface but not being bonded to the surface is used to selectively direct the particle stream to the portions of the surface to produce discrete coated portions on the surface coinciding with the size and configuration of the opening andwherein the product particle stream is altered during the coating process to deposit different product particle compositions at the different locations along the surface so as to produce the patterned coating with the varying composition areas. 17. The method of claim 16 wherein the radiation beam is a light beam and wherein the reactant stream intersects the light beam to form a reaction zone at which the product particle stream is formed wherein the light beam does not intersect the surface. 18. The method of claim 16 wherein the reactant stream is formed by an inlet nozzle that is elongated in a first dimension relative to the second dimension that is orthogonal to the first dimension, the elongated first dimension of the inlet nozzle being longer than a width of the surface such that the coating is formed on the entire surface with one linear pass of the surface through the product particle stream. 19. The method of claim 16 wherein the reactant stream comprises vapor precursors of the product particles and wherein composition of the reactant stream is varied by adjusting a flow of reactants through mass flow controllers. 20. The method of claim 16 wherein the reactant stream comprises aerosol precursors of the product particles and wherein the composition of the reactant stream is varied by adjusting the flow to an aerosol generator that produces at least a portion of the aerosol precursors of the reactant stream. 21. The method of claim 16 wherein the varying composition areas varies in an approximately step-wise manner, 22. The method of claim 16 wherein the varying composition areas varies in a gradual manner. 23. The method of claim 16 wherein the surface and the product particle stream are moved relative to each other to coat the surface. 24. The method of claim 16 wherein the directing of the product particle stream at the surface comprises depositing a plurality of product particle streams having different particle compositions from each other.