Figure 7: Angular spectra intensity of the beams.
From: Quantifying the influence of Bessel beams on image quality in optical coherence tomography
(a) Bessel beam. The small inset shows the PSF at DOF centre. (b) Gaussian beam. The small inset shows the PSF at focus. Both beams have an effective NAeff = 0.12, indicated by the locus of wavevectors corresponding to 1/e2 spatial frequency spectral width.
