Speckle imaging of annular Hermite Gaussian laser beam
Hamed, Abdallah;
Abstract
Fourier transform (FT) corresponding to the diffuser has a comb function realised from uniform
illumination, and hence the speckle image is nearly equal to comb point spread function (PSF). Consequently,
the resulted distribution permits computation of the speckle size from the FWHM corresponding to the PSF of
the HGnm annular aperture. In the second method, the numerical autocorrelation of the speckle images using new
apertures are computed and the speckle sizes are obtained. The results in both methods are compared with the
speckle images obtained using circular aperture. It is noted that, the maximum number of spots produced in the
HGnm modes given by combinations m, n ∈ [0, 5] is (m + 1) (n + 1) = 36 and all images and plots are obtained
using Mat-Lab codes.
illumination, and hence the speckle image is nearly equal to comb point spread function (PSF). Consequently,
the resulted distribution permits computation of the speckle size from the FWHM corresponding to the PSF of
the HGnm annular aperture. In the second method, the numerical autocorrelation of the speckle images using new
apertures are computed and the speckle sizes are obtained. The results in both methods are compared with the
speckle images obtained using circular aperture. It is noted that, the maximum number of spots produced in the
HGnm modes given by combinations m, n ∈ [0, 5] is (m + 1) (n + 1) = 36 and all images and plots are obtained
using Mat-Lab codes.
Other data
Title | Speckle imaging of annular Hermite Gaussian laser beam | Authors | Hamed, Abdallah | Keywords | Higher-order laser transverse modes;Hermite–Gaussian annular aperture;autocorrelation of the speckle images;point spread function | Issue Date | 13-Nov-2021 | Publisher | Indian Academy of Sciences | Journal | Pramana – J. Phys. | Volume | 95 | DOI | https://doi.org/10.1007/s12043-021-02231-9 |
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