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All-optical phase conjugation using diffractive wavefront processing
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DOI：10.1038/s41467-024-49304-y.png)
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Abstract
En 中文
Optical phase conjugation (OPC) is a nonlinear technique used for counteracting wavefront distortions, with applications ranging from imaging to beam focusing. Here, we present a diffractive wavefront processor to approximate all-optical phase conjugation. Leveraging deep learning, a set of diffractive layers was optimized to all-optically process an arbitrary phase-aberrated input field, producing an output field with a phase distribution that is the conjugate of the input wave. We experimentally validated this wavefront processor by 3D-fabricating diffractive layers and performing OPC on phase distortions never seen during training. Employing terahertz radiation, our diffractive processor successfully performed OPC through a shallow volume that axially spans tens of wavelengths. We also created a diffractive phase-conjugate mirror by combining deep learning-optimized diffractive layers with a standard mirror. Given its compact, passive and multi-wavelength nature, this diffractive wavefront processor can be used for various applications, e.g., turbidity suppression and aberration correction across different spectral bands. The authors present a diffractive optical processor that approximates optical phase conjugation operation without any digital computing. This compact and all-optical wavefront processor can be used for various applications, including turbidity suppression and aberration correction.
Keywords:
ANGULAR SPECTRUM
TURBIDITY SUPPRESSION
SCATTERING MEDIA
TIME
COMPENSATION
SPACE
PROPAGATION
ABERRATIONS
DISPERSION
PLANES
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