Experimental Evidence of Vortex $γ$ Photons in All-Optical Inverse Compton Scattering

• URL: http://arxiv.org/abs/2503.18843v1
• Date: Mon, 24 Mar 2025 16:16:39 GMT
• Title: Experimental Evidence of Vortex $γ$ Photons in All-Optical Inverse Compton Scattering
• Authors: Mingxuan Wei, Siyu Chen, Yu Wang, Xichen Hu, Mingyang Zhu, Hao Hu, Pei-Lun He, Weijun Zhou, Jiao Jia, Li Lu, Boyuan Li, Feng Liu, Min Chen, Liming Chen, Jian-Xing Li, Wenchao Yan, Jie Zhang,
• Abstract summary: Vortex $gamma$ photons carrying orbital angular momenta (OAM) hold great potential for various applications.<n>Here, we successfully generate sub-MeV vortex $gamma$ photons via all-optical inverse Compton scattering of relativistic electrons colliding with a sub-relativistic Laguerre-Gaussian laser.<n>Our method provides the first experimental evidence for detecting vortex $gamma$ photons and opens a new perspective for investigating OAM-induced quantum phenomena in broad fields.
• Score: 17.857222379547114
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Vortex $\gamma$ photons carrying orbital angular momenta (OAM) hold great potential for various applications. However, their generation remains a great challenge. Here, we successfully generate sub-MeV vortex $\gamma$ photons via all-optical inverse Compton scattering of relativistic electrons colliding with a sub-relativistic Laguerre-Gaussian laser. In principle, directly measuring the OAM of $\gamma$ photons is challenging due to their incoherence and extremely short wavelength. Therein, we put forward a novel method to determine the OAM properties by revealing the quantum opening angle of vortex $\gamma$ photons, since vortex particles exhibit not only a spiral phase but also transverse momentum according to the quantum electrodynamics theory. Thus,$\gamma$ photons carrying OAM anifest a much larger angular distribution than those without OAM, which has been clearly observed in our experiments. This angular expansion is considered as an overall effect lying beyond classical theory. Our method provides the first experimental evidence for detecting vortex $\gamma$ photons and opens a new perspective for investigating OAM-induced quantum phenomena in broad fields.

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