I'll bet putting this thing together this takes some skill and practice.

[NNadir]

This text below appears in this paper: H. Brands,a N. Chandrasekhar,a H. Hipplera and A.-N. Unterreiner Ultrafast dynamics of excess electrons in molten salts: Part II.† Femtosecond investigations of Na–NaBr and Na–NaI melts Phys. Chem. Chem. Phys., 2005,7, 3963-3969

The sample container consisted of two circular windows of 30 mm diameter (single crystals of sapphire) that are pressed inside a high-temperature refractory steel mount. A thin tantalum wire accomplished the sealing between the sapphire windows. One sapphire plate had a circular groove with a volume of about 1 cm3 , which served as a reservoir for the M– MX mixtures. Two rings of graphite compensated the difference in thermal expansion between the sapphire parts and the stainless steel mount. The required amounts of salt and metal (XNa B 0.003) were carefully weighed and transformed into the sapphire reservoir which was subsequently sealed. The optical cell was then mounted in the high-temperature vacuum recipient where the samples were slowly heated (20 K per hour) to the desired temperatures under vacuum. As can be seen in Fig. 1, pump and probe beams were adjusted such that they overlapped temporally and spatially in the sample at an angle of B51. All pump–probe experiments were repeated twice with freshly prepared samples in order to validate the data...

I'm sure I'd bust the thing.