Wavefront autocorrelation of femtosecond laser beams

Ruediger Grunwald; Uwe J. Neumann; Uwe Griebner; Klaus Reimann; Guenter Steinmeyer; Volker Kebbel

doi:10.1117/12.526722

1 June 2004 Wavefront autocorrelation of femtosecond laser beams

Ruediger Grunwald, Uwe J. Neumann, Uwe Griebner, Klaus Reimann, Guenter Steinmeyer, Volker Kebbel

Proceedings Volume 5333, Laser Resonators and Beam Control VII; (2004) https://doi.org/10.1117/12.526722
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

Abstract

Spatially resolved wavefront sensing and time-resolved autocorrelation measurement of ultrashort pulses are usually separated procedures. For few-cycle pulses with significant spatial inhomogeneities and poor beam quality, a fully spatio-temporal beam characterization is necessary. Here we report on a new concept for a joint two-dimensional mapping of local temporal coherence and local wavefront tilt based on the combination of collinear autocorrelation and Shack-Hartmann wavefront sensing. Essentially for this "wavefront autocorrelation" is a splitting of the beam into a matrix of Bessel-like sub-beams by an array of thin-film microaxicons. The sub-beams are further processed by a two-dimensional collinear autocorrelation setup. The second harmonic distribution of sub-beams at a defined distance is imaged onto a CCD camera. The nondiffractive sub-beams ensure an extended depth of focus and a low sensitivity towards angular misalignment or axial displacement. With low-dispersion small-angle refractive-reflective shapers, wavefront-sensing of Ti:sapphire laser wavepackets was demonstrated experimentally for the first time.

Citation Download Citation

Ruediger Grunwald, Uwe J. Neumann, Uwe Griebner, Klaus Reimann, Guenter Steinmeyer, and Volker Kebbel "Wavefront autocorrelation of femtosecond laser beams", Proc. SPIE 5333, Laser Resonators and Beam Control VII, (1 June 2004); https://doi.org/10.1117/12.526722

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