Computational solutions of the coupled differential equations along the crystal length for FEL powers of 400, 800, and .
Layout of the SHG-FROG system. Cry, frequency-doubling Te crystal; BS, beam splitter; RR, retroreflector; OD, optical delay; PM, parabolic mirror.
(a) Measured trace and (b) retrieval trace.
Intensity profile (solid line) and phase (dashed line) of the retrieved pulse in the time domain. Pulse duration at FWHM is 0.6 ps.
SHG autocorrelation intensity profiles. Solid and dashed lines indicate the profile calculated from the retrieved pulse and the measured pulse, respectively.
Spectral intensity profiles and phase. Solid, dashed, and dotted lines represent the profile of the retrieved pulse, the spectral phase, and the measured spectrum, respectively. Further, 0 THz corresponds to a FEL wavelength of . The spectral width at FWHM is 5.2 THz.
Physical properties of Te crystal.
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