Longitudinal coherence measurements of a transient collisional x-ray laser

Abstract : We present what is to our knowledge the first longitudinal coherence measurement of a transient inversion collisional x-ray laser. We investigated the picosecond output of a Ni-like Pd x-ray laser at 14.68 nm generated by the COMET laser facility at the Lawrence Livermore National Laboratory. Interference fringes were generated with a Michelson interferometer setup in which a thin multilayer membrane was used as a beam splitter. We determined the longitudinal coherence for the 4d1S01→4p1P1 lasing transition to be ~400μm (1/e half-width) by changing the length of one interferometer arm and measuring the resultant variation in fringe visibility. The inferred gain-narrowed linewidth of ~0.29pm is a factor of 4 less than previously measured in quasi-steady-state x-ray laser schemes.
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Optics Letters, Optical Society of America, 2003, 28 (22), pp.2261-2263. 〈10.1364/OL.28.002261〉
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Raymond F. Smith, James Dunn, James R. Hunter, J. Nilsen, Sébastien Hubert, et al.. Longitudinal coherence measurements of a transient collisional x-ray laser. Optics Letters, Optical Society of America, 2003, 28 (22), pp.2261-2263. 〈10.1364/OL.28.002261〉. 〈hal-00873446〉

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