Frequency chirp-induced enhancement of electron-positron pair production in polarized laser fields

doi:10.1088/1674-1056/ae0a3c

Abstract We investigate electron-positron pair production in frequency-chirped, polarized laser fields using the Dirac-Heisenberg-Wigner formalism. A key theoretical finding is the polarization-dependent critical chirp threshold $b_{\rm c}(\delta)$, which marks the transition between tunneling-dominated and multiphoton pair production regimes: $b_{\rm c}$ doubles as polarization evolves from linear ($\delta=0$, $b_{\rm c}(0)=0.02 {\rm m}^2$) to circular ($\delta=1$, $b_{\rm c}(1)=0.04 {\rm m}^2$). Above this threshold, chirp induces spectral compression with the momentum distribution width scaling as $\Delta q \propto b^{-1/2}$, concentrating pairs into a smaller phase-space volume and enhancing production yields by up to three orders of magnitude, following the universal scaling law $n \propto (b\tau)^{3/2}$. Notably, non-monotonic polarization dependence is observed at intermediate chirp values, where linear polarization temporarily surpasses circular in yield before convergence at large $b$. These results establish chirp as a precise control parameter for optimizing EP pair production in nonperturbative quantum electrodynamics, advancing the theoretical framework for understanding quantum vacuum dynamics and providing a foundation for structured pulse engineering in strong-field quantum electrodynamics.

Keywords: electron-positron pair production frequency chirp laser polarization Dirac-Heisenberg-Wigner formalism strong-field QED spectral compression critical threshold

Received: 04 August 2025
Revised: 12 September 2025
Accepted manuscript online: 23 September 2025

PACS:	52.38.-r	(Laser-plasma interactions)
	12.20.-m	(Quantum electrodynamics)
	13.40.-f	(Electromagnetic processes and properties)

Fund: This work was supported by the Natural Science Foundation of the Xinjiang Uyghur Autonomous Region, China, (Grant No. 2024D01A54).

Corresponding Authors: Obulkasim Olugh
E-mail: obulkasimolugh@163.com

Cite this article:

Obulkasim Olugh(吾布力卡斯木·吾鲁克) Frequency chirp-induced enhancement of electron-positron pair production in polarized laser fields 2026 Chin. Phys. B 35 045202

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Frequency chirp-induced enhancement of electron-positron pair production in polarized laser fields

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