Ultrafast control of fractional orbital angular momentum of microlaser emissions

Author:

Zhang ZhifengORCID,Zhao Haoqi,Pires Danilo Gomes,Qiao Xingdu,Gao Zihe,Jornet Josep M.ORCID,Longhi Stefano,Litchinitser Natalia M.,Feng Liang

Abstract

AbstractOn-chip integrated laser sources of structured light carrying fractional orbital angular momentum (FOAM) are highly desirable for the forefront development of optical communication and quantum information–processing technologies. While integrated vortex beam generators have been previously demonstrated in different optical settings, ultrafast control and sweep of FOAM light with low-power control, suitable for high-speed optical communication and computing, remains challenging. Here we demonstrate fast control of the FOAM from a vortex semiconductor microlaser based on fast transient mixing of integer laser vorticities induced by a control pulse. A continuous FOAM sweep between charge 0 and charge +2 is demonstrated in a 100 ps time window, with the ultimate speed limit being established by the carrier recombination time in the gain medium. Our results provide a new route to generating vortex microlasers carrying FOAM that are switchable at GHz frequencies by an ultrafast control pulse.

Funder

National Science Foundation

United States Department of Defense | United States Army | U.S. Army Research, Development and Engineering Command | Army Research Office

Publisher

Springer Science and Business Media LLC

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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