Interesting... But I can't believe it took so long to get around to what should have been obvious.
------- Original Message ------- On Wednesday, December 21st, 2022 at 12:07 AM, Andrew Meulenberg <mules...@gmail.com> wrote: > 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: >>> >>>>>>
