We discuss the features of a shaping device consisting of a spectral amplitude modulator followed by a pair of diffraction gratings arranged as a linear dispersive stretcher. The system is proposed in view of transforming input short pulses into much longer target pulses. The shaper transfers a spectral amplitude profile into a temporal profile. The device is interesting for its mechanical simplicity, its stability to perturbations of input pulse parameters and optical apparatus alignment and finally for its capability to provide long rectangular pulses with fast rise time as required by radiofrequency electron guns.
Ilario et al. (Thu,) studied this question.