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Retrieving the phase of high-power laser beams by sequential multi-plane imaging of the focal region
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- Journal:
- High Power Laser Science and Engineering / Volume 14 / 2026
- Published online by Cambridge University Press:
- 05 May 2026, e39
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- Article
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We present the characterization of intensity distributions and the beam wavefront along the caustic of an iodine photodissociation laser beam at the Prague Asterix Laser System. Its
$700\;\mathrm{J},300\;\mathrm{ps}$ laser pulse was attenuated by neutral-density optical filters and focused by an 
$f/2.2$ aspherical lens. In multiple planes at and around the focus position (
$\pm 7\times \mathrm{Rayleigh}\kern0.17em \mathrm{length}$), we measured fluence distributions by far-field imaging with a nonlinearity-corrected camera. We used these measurements to retrieve the beam wavefront by a phase retrieval algorithm with dynamic input–output mixing. We then propagated the beam to the focus position and to the lens position. The calculated peak intensity at the focus position was 
$7.9\times {10}^{18}\;\mathrm{W}/{\mathrm{cm}}^2$, and 
$300\;\mathrm{J}$ (43% of the pulse energy) was contained within the intensity region above the relativistic intensity threshold of 
$0.8\times {10}^{18}\;\mathrm{W}/{\mathrm{cm}}^2@1315.2\;\mathrm{nm}$.
