scalar_diffraction_propagation

colibri.optics.functional.scalar_diffraction_propagation(field, distance, pixel_size, wavelength, approximation)

Compute the optical field propagation using a scalar diffraction theory model which is given by the specific approximation selected.

Note

• if ‘approximation’ is ‘fresnel’, the transfer function is calculated using colibri.optics.functional.transfer_function_fresnel().

• if ‘approximation’ is ‘angular_spectrum’, the transfer function is calculated using colibri.optics.functional.transfer_function_angular_spectrum().

• if ‘approximation’ is ‘fraunhofer’, the transfer function is calculated using colibri.optics.functional.fraunhofer_propagation().

• if ‘approximation’ is ‘fraunhofer_inverse’, the transfer function is calculated using colibri.optics.functional.fraunhofer_inverse_propagation().

Parameters:

• field (torch.Tensor) – Input optical field of shape (C, M, N).

• distance (float) – Propagation distance in meters.

• pixel_size (float) – Pixel size in meters.

• wavelength (list) – List of wavelengths in meters.

• approximation (str) – Approximation (or diffraction model type) to use, can be “fresnel”, “angular_spectrum” or “fraunhofer”.

Returns:

The propagated optical field according to the selected approximation of shape (C, M, N).

Return type:

torch.Tensor