Advances of high intensity lasers have opened up the field of strong field physics and led to a broad range of technological applications. Recent x ray laser sources and optics development makes it possible to obtain extremely high intensity and brightness at x ray wavelengths. In this paper, we present a system design that implements chirped pulse amplification for hard x ray free electron lasers. Numerical modeling with realistic experimental parameters show that near-transform-limit single-femtosecond hard x ray laser pulses with peak power exceeding 1 TW and brightness exceeding 4 × 10 35 s −1 mm −2 mrad −2 0.1%bandwdith −1 can be consistently generated. Realization of such beam qualities is essential for establishing systematic and quantitative understanding of strong field x-ray physics and nonlinear x ray optics phenomena.High-intensity high-brightness x-ray pulses from free electron laser (FEL) have opened up many new routes of research for strong field physics [1, 2], non-linear x-ray optics, and many potential applications [3][4][5][6][7][8][9][10][11][12]. While the past decade have witnessed many first demonstrations, one major obstacle towards a quantitative, systematic and application-oriented understanding of the subject came from the stochastic temporal and spectral structure of the pulses [13]. Production of Terawatt-femtosecond (TW-fs) hard x ray pulses with full spatial and temporal coherence is therefore highly desired. This calls for allround-improvement of the x ray beam quality, including peak intensity, peak brightness, and a well defined spatial temporal profile, which are mandatory for quantitative analysis and prediction of the nonlinear observables.Currently, the peak power of a state-of-art free electron laser (FEL) can reach 100 GW scale [14] through self-amplified spontaneous emission (SASE). To push the peak power into TW scale, several enhanced-SASE schemes [15][16][17] have projected terawatt-attosecond (TWas) output by using extremely high peak current. A super-radiance based approach [18] was shown to be capable of delivering TW hard x-ray pulses with a sequence of short electron bunches and electron and optical delay devices. These approaches still inherited the rugged temporal characteristics of SASE, while also requiring electron beam parameters beyond the current state-of-art. Self-seeding techniques were adopted to improve the temporal coherence up on SASE [19][20][21][22] with impressive peak brightness improvement. However,
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