Patent ID: 6034984
Filing Date: 2000-03-07
Classification: G03F,H01S

Abstract:
An electric discharge laser apparatus comprising:a tangential fan configured to recirculate a lasing gas mixture, said tangential fan comprising;a rotation axis having a first end and a second end opposite said first end;a circumference substantially concentric with said rotation axis;a plurality of blade members disposed proximate to said circumference, such that a blade member extends substantially parallel to said rotation axis between said first end and said second end; anda cutoff member, said cutoff member being fixed in position and having a tapered edge proximate to a portion of said circumference, such that said tapered edge is oriented diagonally relative to said rotation axis and said plurality of blade members;wherein said tapered edge oriented diagonally relative to said blade members reduces pulse output fluctuations and aerodynamic buffeting as compared with cutoff members which are parallel to fan blade members.