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Ultrafast control of fractional orbital angular momentum of microlaser emissions.


ABSTRACT: On-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.

SUBMITTER: Zhang Z 

PROVIDER: S-EPMC7576132 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Ultrafast control of fractional orbital angular momentum of microlaser emissions.

Zhang Zhifeng Z   Zhao Haoqi H   Pires Danilo Gomes DG   Qiao Xingdu X   Gao Zihe Z   Jornet Josep M JM   Longhi Stefano S   Litchinitser Natalia M NM   Feng Liang L  

Light, science & applications 20201021


On-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 demonstra  ...[more]

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