Abstract
We present a novel, to the best of our knowledge, design for the spectrally resolved wavefront diagnostics of ultrashort laser pulses. The design uses quasi-self-referenced interferometry (qSRI), is completely achromatic, and avoids dispersion. The qSRI utilizes a perfect reference beam enabling an absolute measurement of the near-field spatial phase distributions for the different spectral components of ultrashort laser pulses. For this, a Mach–Zehnder geometry is coupled with a spatial filter. Combining the qSRI with a reflective grating allows for the measurement of phase fronts in the whole spectrum of a broadband laser pulse without any calibration.
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