Bessel-like beams with z-dependent cone angles

Area of Science:

• Optics and Photonics
• Laser Physics

Background:

• Conventional Bessel-Gauss beams generated using axicons suffer from abrupt intensity changes at the edge of their non-diffracting region.
• This limitation restricts the practical applications of these beams in scenarios requiring extended propagation distances without significant intensity loss.

Purpose of the Study:

• To theoretically propose and experimentally validate a new method for generating Bessel-like beams.
• To overcome the inherent limitations of conventional axicon-based Bessel beam generation.
• To achieve a significantly larger quasi non-diffracting propagation region.

Main Methods:

• Theoretical outlining of a concept for creating Bessel-like beams with a z-dependent cone angle.
• Experimental demonstration of the proposed concept.
• Utilizing optical principles to control beam propagation characteristics.

Main Results:

• Successful creation of Bessel-like beams exhibiting a z-dependent cone angle.
• Demonstration of an extended quasi non-diffracting propagation region compared to conventional methods.
• Experimental validation of the theoretical predictions.

Conclusions:

• The proposed method effectively generates Bessel-like beams with enhanced non-diffracting propagation.
• This approach offers a significant advantage over traditional axicon-based techniques by mitigating abrupt intensity changes.
• The findings pave the way for new applications utilizing beams with extended stable propagation characteristics.