Things have gone beyond simple UV protection. At a quick glance, I found this from 2014: "Ion exchange doping of solar cell coverglass for sunlight down-shifting" https://scholar.google.com/scholar_url?url=https://www.academia.edu/download/39434467/Ion_exchange_doping_of_solar_cell_coverg20151026-13237-11ddof9.pdf&hl=en&sa=X&ei=jkyiY7KwAY6yyATvqZyoBQ&scisig=AAGBfm2yTEGoICv5hlwEB0RulQA-SecuDg&oi=scholarr
On Tue, Dec 20, 2022 at 4:59 PM MSF <foster...@protonmail.com> wrote: > > I was working with this method of surface treatment of glass more decades > ago than I care to remember. You simply immerse ordinary glass into a bath > of molten potassium nitrate and the sodium Ions at the surface are replaced > with potassium ions, resulting in a highly impact resistant glass. These > days it's called gorilla glass, but I was using this technique long before > Corning. > > I see that cerium doped sheet is just glass, not fused silica. So it may > be that no cerium ions could be implanted into pure silica by the molten > salt technique. > > I recently discovered a method of depositing a layer of silica on any > given surface using a ridiculously simple and inexpensive technique. This > is something that should have been discovered 200 or so years ago, but > wasn't. I've searched for months trying to find out if this was done > before, but I find no reference to it. The silica layer deposited is only a > few tens of microns thick, but the process can be repeated. Other compounds > can be included; so far I've only tried copper. This is a solid transparent > well adhered layer, not some powdered composite. I really don't know what > to do with this, probably nothing. Thought you might be interested anyway. > > ------- Original Message ------- > On Tuesday, December 20th, 2022 at 10:00 PM, Andrew Meulenberg < > mules...@gmail.com> wrote: > > Foster, > You have raised an interesting possibility. I have been out of the loop > for 25 years, so my info may be dated. However, the cerium was included in > the melt, with the quantity a djusted for the optimum UV absorption for the > coverslide thickness. > > Use of a doped layer rather than the bulk could possibly provide some > improved optical matching in the "STACK". It would have to be tested for > stability during the thermal cycles. If the surface doping (by dipping or > by ion implantation) is a reliable process, this might be worth mentioning > it to the appropriate people (who I no longer know). > > Andrew > > ---------- Forwarded message --------- > > > I guess this is getting off into the weeds a bit, but is the quartz layer > doped with cerium in the mass? Or is the cerium diffused into the surface > by immersion in a molten cerium compound? > > -- > On Tuesday, December 20th, 2022 at 2:26 AM, Andrew Meulenberg < > mules...@gmail.com> wrote: > > >> > >> >> > >
