Patent Number: 
Section: claims

1. A device for connecting a first depressurization vessel to a second depressurization vessel, the device comprising:a communication hole comprising:a first opening which is connected to the first depressurization vessel, anda second opening which is connected to the second depressurization vessel, the first opening and the second opening being, respectively, at opposite ends of the communication hole such that extreme ultraviolet radiation passes in a radiation direction from the first opening to the second opening;a gas inlet through which a gas from a gas supply unit flows into the communication hole in a direction perpendicular to the radiation direction of the extreme ultraviolet radiation; anda first gas outlet which is opposed to the gas inlet such that the gas is exhausted from the gas outlet by a first gas exhaust unit;at least one second gas outlet provided on a side of the second depressurization vessel with respect to the first gas outlet such that the gas supplied through the gas inlet is exhausted by a second gas exhaust unit, wherein the second gas outlet is arranged not opposed to the gas inlet. 2. The device of claim 1, wherein the gasdoes not absorb the extreme ultraviolet radiation. 3. The device of claim 2, further comprising:at least one third gas outlet provided on a side of the first depressurization vessel with respect to the first gas outlet such that the gas supplied through the gas inlet is exhausted by a third gas exhaust unit, wherein the third gas outlet is arranged not opposed to the gas inlet. 4. The device according to claim 2, wherein a pressure inside the first depressurization vessel is higher than a pressure inside the second depressurization vessel. 5. The device according to claim 1, wherein an opening of the gas inlet and an opening of the first gas outlet each has a rectangular shape of about 5 mm by about 5 mm. 6. An exposure equipment comprising:a first depressurization vessel that comprises a component for radiating extreme ultraviolet radiation and a first opening through which the extreme ultraviolet radiation passes;a second depressurization vessel that comprises a second opening for receiving the extreme ultraviolet radiation passed from the first depressurization vessel; anda connection device which connects the first depressurization vessel to the second depressurization vessel, the connection device comprising:a communication hole comprising two opening ends disposed on opposite sides, respectively, of the communication hole, wherein the first opening and the second opening are opposed to each other and are connected to respective ones of the two opening ends;a gas inlet through which a gas, which does not absorb the extreme ultraviolet radiation, flows in a direction perpendicular to a passing direction of the extreme ultraviolet radiation; anda first gas outlet which is provided at a position opposed to the gas inlet so as to remove the gas from the communication hole;at least one second gas outlet which is provided between the second depressurization vessel and the first gas outlet so as to remove the gas from the communication hole; andat least one third gas outlet which is provided between the first depressurization vessel and the first gas outlet so as to remove the gas from the communication hole;a gas supply unit connected to the gas inlet so as to supply the gas to the connection device; anda gas exhaust unit comprising:a first gas exhaust unit connected to the first gas outlet so as to remove the gas;a second gas exhaust unit connected to one of the at least one second gas outlet so as to remove the gas; anda third gas exhaust unit connected to one of the at least one third gas outlet so as to remove the gas.