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TY - UNPB AU - Deng, H.X. ED - Bishofberger, Kip:Carlsten, Bruce (LANL, Los Alamos, NM, USA)[ORCID:0000-0001-5619-907X] ED - Schaa, Volker RW TI - Harmonic Lasing & Gain Cascading: More Efficient X-Ray Free Electron Laser Oscillators J2 - Proc. of FEL2017, Santa Fe, NM, USA, August 20-25, 2017 C1 - Santa Fe, NM, USA T2 - International Free Electron Laser Conference T3 - 38 LA - english AB - In this talk, I will focus on the recent theoretical progresses on X-ray free-electron laser oscillator (XFELO). A simplified one-dimensional theoretical model for fast XFELO optimization, harmonic lasing XFELO scheme which reduces the requiered beam energy for a interested radiation wavelength, and the gain-cascading scheme which may increase the pulse energy and the peak power of XFELO will be presented. PB - JACoW CP - Geneva, Switzerland ER -