Think of the tube as a clear discharge cylinder with gas inside (CO₂ with helpers like N₂ and He) and cooling water circulating around it. The high-voltage DC supply excites the gas; the excited CO₂ emits invisible mid-infrared light, mainly near 10.6 µm (sometimes 9.6 µm). The light builds up between an internal mirror and an output window; a portion exits, then travels through your machine’s mirrors and focusing lens to the material. The machine’s built-in reservoir and pump circulate distilled/DI water through the tube’s water jacket to carry heat away and keep temperature stable.
FLUX CO₂ models, beamo, Beambox Series, and HEXA, use a DC-excited, water-cooled glass CO₂ tube. Each tube has water-cooling inlet/outlet and anode/cathode leads; the HV/LV connections are pre-arranged to simplify end-user replacement. Cooling is a closed loop driven by the machine’s built-in reservoir and pump, you fill with distilled/DI water via the pump’s tank, purge air on the panel, and keep the tank around 80% full to avoid bubbles and maintain flow.
