Optical glasslens

Thorlabs' Stabilized Helium Neon (HeNe) Laser, with a center wavelength of 632.992 nm, allows for either frequency or intensity stabilization, necessary for ...

Our high homogeneity glass has a crucial role to play in high-power laser applications and astronomy, while our i-Line glass offers high UV transmittance. Cameras and medical instruments also rely on our precision-molded glasses, while HT and HTUltra glasses allow outstanding transmittance for projector or high-end optical systems.

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Asymmetric crystals can be utilized to produce polarized light when an electric field is applied to the surface. A common scientific device that employs this ...

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if i bisque to cone 08 (as suggested in the podcast) and then test glaze fire a plate with no difference in the result; how much do i re-bisque the rest of the bisqued ware on (cone) to get them to as if they were bisqued at cone 04 to begin with? (if that made sense..)

If your problem glaze is just one or two, of many, then its best to go after recipe and not temp. If your problems are across the board, affecting all glazes in other words, then such changes may be warranted.

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Our unrivalled range of around 120 glass types is constantly evolving as new innovations and melting processes are introduced to optimize efficiency and cost-effectiveness. SCHOTT optical glasses are available in the form of raw glass, cut blanks and pressings, as well as finished components, and we work closely with customers to tailor our products to their needs.

Pinholes come from off-gassing feldspars: blisters come from off-gassing inorganics- primarily from iron disulfide. (sulfides) You either slow the firing down between 1250-to-1800F, or slow the kiln down from 2050F up to peak (cone5/6). The brown splotches of color in the tan area of your glaze is a goodindicator of iron bearing clay: in this case iron disulfide. When a crater forms around the blister, and barren clay can be seen in the center of the crater: almost always inorganic materials burning off. -- Tom

A lot of gas can be chemically dissolved into the glaze as it melts. As you keep increasing the temperature the chemical solubility of the gas decreases along with more silica arriving into the melt also changing how soluble those gasses are.

Kohärenz ist die Voraussetzung für das Auftreten von Interferenz. Während es möglich ist, Schallwellen oder von elektrischen Sendern emittierte Wellen auf ...

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-this was the first time i closed all three peepholes at the side during a glaze fire (and more air flow makes pinholes less likely?)

on top of this i heard a podcast episode of: ‘for flux sake’ (which i found a tip about in here), where they concluded with bisque firing at a LOWER temperature rather than a HIGHER was better to prevent pinholes. to have higher absorption of the clay and pack the glaze particles tighter against the surface and have less ‘open space’ between the glaze particles (air that eventually will become pinholes..).

-larger kiln vs smaller kiln and different cooling can give different results? (but in my case then it should be the other way around..?)

SCHOTT is both ISO 9001 and 14001 certified. Our optical glass is subjected to stringent quality inspection before shipping, and the production of optical glass is constantly monitored at all stages.

Looks like the glaze is full of tiny bubbles and firing a little hotter has let them join together and start rising to the surface.  Firing again just let more of them join together so you can see them, I would guess the ones fired in the small kiln are still full of tiny bubbles but they are just hard to make out and look more like a texture.

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What does HWP mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: HWP. · Half Wave Plate · Height Weight ...

Blistering is when gas bubbles rise through the glaze, when the glaze is molten, and pop open. (And then the glaze cools before the blister can smooth over. )

A cone 06 bisque is so standard in pottery that few consider making this a variable. You can concentrate on the proper melting of your glazes by focusing on glaze composition and firing temperature/atmosphere/heat work.

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To pick up on Rae's point: changing the bisque temp can sometimes greatly affect the absorption of your bisque pots. This, in turn, will then affect how your glaze is absorbed and, in turn , affect how your glazes turn out.

this makes sense i think, but is also very confusing as it seems that the most common advice is to increase the bisque temperature to prevent the pinholes.. the only thing i was certain about was that i would try bisque firing higher, but now i’m not sure anymore. and if any of you bisque fire lower (08 or lower) as a rule, do you hold as well, or is a ‘slow program’ sufficient?

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i was really sad about all these pinholes and desperately tried refiring them, again at cone 6; this time with all peepholes out. this resulted in even more pinholes and the speckles in the clay way more ‘melted’ than i like them.

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by S Nemoto · 1986 · Cited by 29 — A simple method has been proposed for determining the waist position and the waist size of a Gaussian beam from measured spot sizes. The method does not require ...

I feel whatever you try with different bisque temperatures the glaze will still look the same and produce thousands of tiny bubbles that can't join together and escape because of high viscosity and surface tension

i’ve made some marbled pieces with a blue and a speckled clay. they are slow bisque fired at cone 05 and slow glaze fired at cone 6. the ones fired in my relatively small kiln just had a few pinholes, and the ones i last fired in my new (old) larger kiln had a lot more pinholes in them. i have some theories about what went wrong after a lot of internet investigation and helpful people and posts in here..:

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The technical properties of the products in the optical glass portfolio offer a wide variety of application use. From high homogeneity and narrow refractive index to exceptional transmittance and low transition temperatures, we can supply optical glass made to your exact specification. With compliance with the latest industry standards plus continuous monitoring and inspection, high quality also comes as standard.

From your initial post, are you aware of cone labelling..08 is lower than cone05, like negative numbering . Just saying. I am reading that you thInk differently.

SCHOTT classifies its optical glass products into groups based on similar physical properties and applications. These include HT and HTUltra Glass, which offer optimum transmission, and i-Line Glass designed for high UV transmission. High Homogeneity Glass, Low Tg Glass for Precision Molding and Radiation Resistant Glass complete the specialist collection.