Extended Data Fig. 8: Measured spectra of undulator radiation. | Nature

Extended Data Fig. 8: Measured spectra of undulator radiation.

From: Free-electron lasing at 27 nanometres based on a laser wakefield accelerator

Extended Data Fig. 8

a, b, Spectra of the undulator radiation with a groove density of the grating of 3,000 lines per mm (a) and 500 lines per mm (b). The radiation wavelength was typically centred at 27 nm with a corresponding electron beam energy of 492 MeV, which is reasonably consistent with the measured values shown in Extended Data Fig. 7. The minimum bandwidth was measured to be 2%, which indicated a reasonable agreement with the simulated values in the exponential-gain regime. The measured spectra of broadband spontaneous emission are also depicted with a bandwidth of approximately 7%.

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