An impacting jet aerodynamic window structure for use in systems where passage of a distortion free light beam is desired. Specifically this window structure is highly effective for use in subsonic flow gas laser systems. The window is optically clear even in the presence of large density or temperature differences between a laser gas and another gas used in the window structure. This form of laser system would include a laser cavity in conjunction with the aerodynamic window structure so that gases can be removed from the laser cavity and which window structure permits the passage of a laser beam through the window structure. The window structure comprises a pair of opposed nozzles which have their outlets spaced apart and axially aligned. One of the nozzles permits the flow of a laser gas from a laser cavity. The second nozzle permits the flow of a gas, of different composition and/or temperature. The two gases are introduced into an interaction region formed between the outlets of the respective nozzles and impact in this interaction region to form a laminar impact plane. A plenum chamber may surround the interaction region and is provided with a pump to remove the gases which are introduced into the region and impact at the laminar impact plane. A method of forming the impacting jet aerodynamic window structure is also disclosed.
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