The investigation of controlling laser focal profile by deformable mirror and wave-front sensor

Zeng, Zhige; Ning, Lixin; Jiang, Wenham

doi:10.1080/09500349908231275

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…In principle, arbitrary intensity profile shaping may be possible, but this would require accurate knowledge of the influence function of the deformable mirror. 4 A simulated annealing algorithm was implemented to shape the focal spot towards certain pre-defined intensity distributions 5 and then extended to optimization of a laser ablation process. 6 The measurement or determination of a process through phase control can be generalized to a set of coherent control problems, which was previously demonstrated in many different systems, including quantum dynamics, 7 trapped atomic ions, 8 chemical reactions, 9 Cooper pairs, 10 quantum dots, 11,12 and THz generation 13 to name but a few.…”

Section: Introductionmentioning

confidence: 99%

Coherent control of plasma dynamics by feedback-optimized wavefront manipulationa)

Hou

Gao

et al. 2015

Phys. Plasmas

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Plasmas generated by an intense laser pulse can support coherent structures such as large amplitude wakefield that can affect the outcome of an experiment. We investigate the coherent control of plasma dynamics by feedback-optimized wavefront manipulation using a deformable mirror. The experimental outcome is directly used as feedback in an evolutionary algorithm for optimization of the phase front of the driving laser pulse. In this paper, we applied this method to two different experiments: (i) acceleration of electrons in laser driven plasma waves and (ii) self-compression of optical pulses induced by ionization nonlinearity. The manipulation of the laser wavefront leads to orders of magnitude improvement to electron beam properties such as the peak charge, beam divergence, and transverse emittance. The demonstration of coherent control for plasmas opens new possibilities for future laser-based accelerators and their applications. V

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Section: Introductionmentioning

confidence: 99%

Coherent control of plasma dynamics by feedback-optimized wavefront manipulationa)

Hou

Gao

et al. 2015

Phys. Plasmas

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“…The objective of adaptive optics has largely been optimization of the laser focal shape to a near diffraction-limited spot, thus producing the highest possible intensity. Adaptive optics can also be useful for certain focal profile shaping 22,23 , optimization of a laser machining process 24 or harmonic generation 25,26 .…”

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confidence: 99%

Coherent control of plasma dynamics

Hou

Lebailly

et al. 2015

Nat Commun

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Coherent control of a system involves steering an interaction to a final coherent state by controlling the phase of an applied field. Plasmas support coherent wave structures that can be generated by intense laser fields. Here, we demonstrate the coherent control of plasma dynamics in a laser wakefield electron acceleration experiment. A genetic algorithm is implemented using a deformable mirror with the electron beam signal as feedback, which allows a heuristic search for the optimal wavefront under laser-plasma conditions that is not known a priori. We are able to improve both the electron beam charge and angular distribution by an order of magnitude. These improvements do not simply correlate with having the 'best' focal spot, as the highest quality vacuum focal spot produces a greatly inferior electron beam, but instead correspond to the particular laser phase front that steers the plasma wave to a final state with optimal accelerating fields.

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Over compensation algorithm for laser beam shaping using a deformable freeform mirror

Feng

Huang

2019

Optik

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The investigation of controlling laser focal profile by deformable mirror and wave-front sensor

Cited by 6 publications

References 9 publications

Coherent control of plasma dynamics by feedback-optimized wavefront manipulationa)

Coherent control of plasma dynamics by feedback-optimized wavefront manipulationa)

Coherent control of plasma dynamics

Over compensation algorithm for laser beam shaping using a deformable freeform mirror

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