An optical configuration suited to the monitoring of a process flow through the wall of a containment vessel for producing a high-quality, high-NA sample focus and reduced residual positive spherical aberration. 5 \u03bcm in height of a Group III nitride compound semiconductor projection part 150, which is made of Mg-doped p-type GaN having Mg doping concentration of 8\xd71019cm3 and is formed through selective growth, is formed on a p-type contact layer 108. The end connector has a geometry capable of nesting with at least one other end connector to minimize a container size required to transport the end connectors. The hollow cubic main body and the plate body cooperatively define a receiving cavity for receiving the movable unit therein. The continuations library provides macros to automatically manage the continuation points. Embodiments for TLC plates and related methods are also disclosed.