In laser-pulse collisions with an annular probe, the main signal emission direction undergoes a phase-transition-like change as the pump waist is varied: continuous for a Gaussian pump, discontinuous for a flat-top pump.
Karbstein, Quantum Vacuum Nonlinearities in Strong Electromagnetic Fields , Habilitation thesis, Friedrich- Schiller-Universit¨at Jena (2023)
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Phase transition analogs in laser collisions with a dark-field setup
In laser-pulse collisions with an annular probe, the main signal emission direction undergoes a phase-transition-like change as the pump waist is varied: continuous for a Gaussian pump, discontinuous for a flat-top pump.