Fig. 9.

The application of GR-based nonlinearity in suppressing the side-lobe artifacts of Bessel beams. (A) The Gaussian beam (first line) vs the Bessel beam (second line) [99]. The Bessel beam provides a much longer focal depth than the Gaussian beam but introduces side lobes. (B) The MAP images of single-layer red blood cell using a Bessel beam [40] as the excitation beam source. PA₁: linear results when no heating was applied. PA₂: linear results after the heating laser shot. ΔPA: nonlinear results (PA₂-PA₁). Figures reproduced with publisher’s permission [40,99].