A container to be positioned in a ring-down optical cavity for containing a sample includes an outer surface having opposing first and second outer faces and an inner surface forming a void for containing the sample and having opposing first and second inner faces. The container may include a first portion...http://www.google.ca/patents/US7064836?utm_source=gb-gplus-sharePatent US7064836 - Brewster's angle flow cell for cavity ring-down spectroscopy
