Figure 5
Calculated intensity profile of the Bessel pump (a and d) and Gaussian Stokes (b and e) beam near the nominal focus.
For the computation of the Bessel beam the illumination angles θp ; max and θp ; min were set to 16° and 13°, respectively. θS was set to 4° for the Gaussian Stokes beam. These computational parameters approximately coincide with the experimental parameters used for the generation of image 7(c) and 6(f). Figure (c) and (f) present the squared absolute value of the polarization density for a homogeneous sample at anti-Stokes frequency. The polarization density appears rod-like with low contribution of the side lobes which is a desirable effect of the quadratic proportionality between polarization density and electrical field of the Bessel shaped pump beam. The green and white bar in (c) and (f) equal 10 μm and 1 μm, respectively.
