The Bessel beam, with a significant depth of field and self-healing characteristics, has been applied in widespread applications, including quantum entanglement, underwater 3D imaging, optical micro-manipulation, microscope, and so on. However, these methods, such as circular slit and lens, axicon, spatial light modulator (SLM), are complicated due to the usage of bulky optical elements and hinder the Bessel beam generation system from being applied in practical applications.
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Source: Phys.org