Sapphire optical viewport for high pressure and temperature applications
arXiv:2106.09559 · doi:10.1063/5.0047609
Abstract
We describe the design of a soldered sapphire optical viewport, useful for spectroscopic applications of samples at high temperatures and high pressures. The sapphire window is bonded via active soldering to a metal flange with a structure of two c-shaped rings made of different metallic materials in between, as to mitigate thermally induced stress. A spectroscopic cell equipped with two of the optical viewports has been successfully operated with alkali metals in a noble gas environment at temperatures in the range °C to °C at noble gas pressures from mbar to bar. At the upper pressure range, we observe a leakage rate smaller than our readout accuracy of mbar per day.
3 pages, 3 figures