High power laser systems based on the chirped pulse amplification (CPA) technique make use of grating pairs to compress the pulse to a short duration. When designing the pulse compressor, it is normally assumed that good beam collimation is a strong requirement in order to avoid spatio-temporal couplings. We analyze the propagation through a single pass compressor without the good collimation approximation and show that this results in a compressed pulse exhibiting pulse front tilt, whose magnitude is proportional to the normalized distance to the beam waist, providing a simple mechanism for controlling the tilt angle. We perform experimental measurements in a large-scale CPA laser for a range of beam curvatures that confirm these results.
Figueira, G., Braga, L., Ahmed, S., Boyle, A., Galimberti, M., Galletti, M., et al. (2020). Pulse front tilt control using non-collimated beams in a single pass grating compressor. OPTICS EXPRESS, 28(5), 7678-7690 [10.1364/OE.28.007678].
Pulse front tilt control using non-collimated beams in a single pass grating compressor
Galletti, Mario;
2020-03-02
Abstract
High power laser systems based on the chirped pulse amplification (CPA) technique make use of grating pairs to compress the pulse to a short duration. When designing the pulse compressor, it is normally assumed that good beam collimation is a strong requirement in order to avoid spatio-temporal couplings. We analyze the propagation through a single pass compressor without the good collimation approximation and show that this results in a compressed pulse exhibiting pulse front tilt, whose magnitude is proportional to the normalized distance to the beam waist, providing a simple mechanism for controlling the tilt angle. We perform experimental measurements in a large-scale CPA laser for a range of beam curvatures that confirm these results.File | Dimensione | Formato | |
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