Patent ID: 8265116

Claim:
An electrical feed-through for a gas discharge laser, the laser including first and second discharge-electrodes within a laser enclosure, the feed-through for conducting RF power from a source thereof without the enclosure, via an impedance-matching network, to the discharge electrodes, the feed-through comprising: a hollow, metal feed-through body having first and second opposite ends, the first end intended to be without the enclosure and the second end intended to be within the enclosure; a plate of an insulating material closing the second end of the feed-through body; an elongated hollow tubular electrode extending through the feed-through body and through an aperture in the insulating-material plate the electrode being closed at the end thereof extending through the insulating-material plate; and a coolant-supply tube having an outside diameter smaller than the inside diameter of the electrode and extending coaxially into the electrode and terminating near the closed end thereof and wherein the electrode and coolant-supply tube are connected to a manifold arranged such that coolant fluid can be directed from the manifold through the coolant-supply tube and the end of the electrode and can return to the manifold via the space between the outer surface of the coolant-supply tube and the inner surface of electrode, said coolant fluid being in direct contact with the inner surface of the electrode.