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Observing angular diffraction with an angular partially coherent beam
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DOI：10.1103/PhysRevApplied.23.014026.png)
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The conjugate variables of angular position and orbital angular momentum have been a toolbox for optical information processing. Here, in order to fully exploit the relationship between the angular position and orbital angular momentum of a partially coherent beam, we propose and generate a new kind of partially coherent beam with angular-correlated coherence structure that can be interpreted as an angular partially coherent beam (APCB). The APCB is generated experimentally by a fast modulated digital micromirror device. The angular diffraction of the generated APCB with the angular analogue of double slits is studied to show the coherent structure of the generated source. We have observed that an APCB with different coherence angles produces different diffraction patterns through the same angular mask, which illustrates an excellent agreement between the numerical simulations and the experimental observations. The specific property of the APCB is important in the optical sensing area, which can be used to identify the angular spacing of objects, to transfer optical information, etc. Our work opens the door for utilizing the photon's angular degree of freedom in a partially coherent beam modulation technique and raises possibilities for optical sensing with a new toolbox such as for quantum image and object identification.
Keyword:
MOMENTUM
LIGHT
MODEL
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4.4
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