An enclosure is configured to receive an electromagnetic wave from a mm wave emitter by a first waveguide positioned between the mm wave emitter and the enclosure. The enclosure includes one or more components configured to manage transmission of the electromagnetic wave in the first mode to a second waveguide positioned relative to a borehole of a well to be formed by the electromagnetic wave transmitted through the second waveguide. The components can include a first port at which a gas is received, a focusing mirror, a frequency sensor, a power measurement sensor, an arc detector, a cooled wire grid, a load cell provided on an exterior surface of the enclosure, or a barrier window. Related apparatus, systems, techniques, and articles are also described.

A method for compensating for ambient light for an arc flash detection system for an electrical equipment, the arc flash detection system including a first optical sensor for detecting an arc flash, the method comprising initiating a recording mode in which a first output signal of the first optical sensor is recorded, wherein recording the first output signal comprises storing a first plurality of values, wherein each value of the first plurality of values is representative of a level of ambient light condition in or around the electrical equipment; terminating the recording mode after a recording time period; determining, based on the first plurality of values, a first quantity characterizing ambient light in or around the electrical equipment; and configuring the arc flash detection system to compensate for ambient light based on the first quantity.