Patent ID: 6782010
Filing Date: 2004-08-24
Classification: G21K,H01S

Abstract:
Limiter optics for an ignition feedback regenerative free electron laser amplifier having a pulsed output beam of predetermined duration from an undulator comprising:A. A pickoff member using a convex pickoff mirror adapted to direct a portion of the output of said pulsed output beam as a pickoff beam and which expands said pickoff beam to a predetermined size; and B. a limiter assembly adapted to bring said directed pickoff beam to a focus at a selected point within said undulator at a selected time where said limiter assembly further comprises: (i) an expander mirror adapted to modify spatial and temporal characteristics of said portion of the output picked off by said pickoff means; (ii) a first focusing optics adapted to focusing said modified directed pickoff beam to a focal point; (iii) a limiter plate movably placed near said focal point so as to allow said focused modified directed pickoff beam to pass through said limiter plate; (iv) adjusting member operably connected to said limiter plate and adapted to move it closer to or farther from said focal point as desired; and (v) a second focusing optics placed after said pickoff beam has passed through said limiter plate and adapted to refocus said focused directed pickoff beam to a predetermined point in said ignition feedback regenerative free electron laser amplifier.