What is the best material for my desired reflectivity?

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For optimal reflectivity of about 95% for both infrared and visible light, polished aluminum is recommended for infrared applications, while fused silica is effective for the visible spectrum. The discussion highlights the need for a cost-effective collimation material that can perform well in both ranges. Suggestions include exploring hybrid materials or coatings that can enhance reflectivity across both spectra. The importance of balancing cost with performance is emphasized, as well as the need for further research into suitable alternatives. Finding a material that meets these criteria is crucial for effective optical applications.
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I need a good reflecting collimation material that is faily cheap and has a reflectivity of about 95% for both infrared and visible light. I know polished aluminum meets the criteria for the infrared, and the fused silica also works well for the visible spectrum, but I need somthing that can collimate both.
 
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