| Paper | Title | Page | 
    
        | MOPAB100 | Progress Report on Population Inversion-Based X-Ray Laser Oscillator | 373 | 
    
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                A. Halavanau, R. Alonso-Mori, A. Aquila, U. Bergmann, D. DePonte, F.-J. Decker, F. Fuller, M. Liang, A.A. Lutman, C. PellegriniSLAC, Menlo Park, California, USA
M. DoyleUCB, Berkeley, USA
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        |  | The population inversion X-ray Laser Oscillator (XLO) is a fully coherent, transform limited hard X-ray source. It operates by repetitively pumping inner-shell atomic transitions with an XFEL, in a closed Bragg cavity. XLO will produce very bright monochromatic X-ray pulses for applications in quantum optics, X-ray interferometry and metrology. We report the progress to build the first XLO operating at the copper alpha line, using LCLS 9 keV SASE X-ray pulses as a pump. |  | 
    
    	  | DOI • | reference for this paper 
              ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB100 |  | 
    
    	  | About • | paper received ※ 20 May 2021       paper accepted ※ 29 July 2021        issue date ※ 02 September 2021 |  | 
    
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