Figure 3: Simulated transverse beam profiles.
From: Quantifying the influence of Bessel beams on image quality in optical coherence tomography

Degradation of an ensemble-average of 10 transverse beam profiles for (a) Gaussian, and (b) Bessel beams on a logarithmic irradiance scale, where 0 dB represents the peak Gaussian irradiance (at focus) attenuated by the overlayers. Transverse profiles are plotted for two depths, shown in Fig. 2, corresponding to 60 μm before the focus, and at the focus (top and bottom, respectively.)