Bessel beam superposition based on annular reflections

Superposition of a Bessel beam with another beam was usually achieved using an Axicon or a SLM. Here we demonstrate a straightforward but powerful method to superpose a Bessel beam with another Bessel beam or a Gaussian beam based on a Digital Mirror Device (DMD). Different ring or circular patterns could be loaded in the DMD to generate Bessel beams or Gaussian beams respectively. By combining the ring and circular patterns, superposition of a Bessel beam with other Bessel beams or Gaussian beams could be achieved without using beam splitting or other complicated optical setups. The new DMD based Bessel beam superposition method could be easily controlled, quickly switched, or conveniently packed.