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>With a bulb made of alumina I didn't mention this in my other comment because I thought the use of alumina could be avoided, but I suggest you look up the pri
by scythe 4y ago
>With a bulb made of alumina
I didn't mention this in my other comment because I thought the use of alumina could be avoided, but I suggest you look up the price of some optical sapphire (ie transparent alumina) before you get excited about that. Even for a tiny, flat circle you're looking at around ten bucks. A bulb would likely be harder.
https://www.uqgoptics.com/catalogue/optical-windows/sapphire/sapphire-windows-plates-random-orientation/ https://www.uqgoptics.com/catalogue/optical-windows/sapphire...
- adrian_b 4y agoThe alumina used must not be transparent, it must be as white as possible for maximum efficiency, so standard cheap alumina ceramic should be OK. The light exits the lamp through a flat window, which is made of quartz in the prototype, but in mass production it is likely that some kind of alumosilicate glass or borosilicate glass would be fine for it.