Figure 3
From: Generating Bessel beams with broad depth-of-field by using phase-only acoustic holograms
Axial field distribution as a function of the design frequency for (a) a truncated-ideal Bessel beam and (b) a phase-only hologram calculated using the Rayleigh-Sommerfeld integral. (c) Axial field distribution for a Bessel beam of f = 5 MHz (continuous-blue) and the corresponding field produced by the phase-only hologram (dashed). (d) Axial field distribution for a Bessel beam of f = 2 MHz (continuous-green) and the corresponding field produced by the phase-only hologram (dashed). (e) Axial field distribution for a Bessel beam of f = 500 kHz (continuous-red) and the corresponding field produced by the phase-only hologram (dashed).
