J. Phys. IV France 11 (2001) Pr2-123-Pr2-126
Spatial coherence measurement of a high average power table-top soft X-ray laserYanwei Liu1, 2, M. Seminario3, F.G. Tomasel3, C. Chang4, 2, J.J. Rocca3 and D.T. Attwood1, 4, 2
1 Applied Science and Technology Graduate Program, University of California at Berkeley, U.S.A.
2 Center for X-ray Optics, Lawrence Berkeley National Laboratory, U.S.A.
3 Department of Electrical and Computer Engineering, Colorado State University, U.S.A.
4 Department of Electrical Engineering and Computer Science, University of California at Berkeley, U.S.A.
An extraordinarily high degree of spatial coherence from a high average power tabletop 46.9 nm laser was observed in two-pinhole interference experiments. Refractive anti-guiding and gain guiding along a capillary discharge-produced plasma column causes a rapid increase of the spatial coherence with amplifier length. Full spatial coherence was approached with a 36 cm long plasma of very high axial uniformity and a length to diameter ratio exceeding 1000:1.
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