Laser fabrication of diffractive optical elements based on detour-phase computer-generated holograms for...

Area of Science:

• Optics and Photonics
• Holography
• Nanofabrication

Background:

• Airy beams exhibit unique self-healing and non-diffracting properties.
• Generating two-dimensional (2D) Airy beams requires sophisticated optical elements.
• Diffractive optical elements offer compact and versatile beam shaping capabilities.

Purpose of the Study:

• To design and fabricate an amplitude diffractive optical element for generating 2D Airy beams.
• To demonstrate a fast, cost-effective, and reliable fabrication process for such elements.
• To explore the potential applications of the fabricated element in beam modulation and UV lithography.

Main Methods:

• Design of a detour-phase computer-generated hologram.
• Fabrication of a 2mm x 2mm diffractive optical element using laser ablation of metallic films.
• Characterization of the element's performance, including transverse profile and propagation analysis.

Main Results:

• Successful fabrication of a diffractive optical element with 5μm x 5μm pixels.
• Demonstration of the element's capability to generate 2D Airy beams.
• Validation of a rapid and economical fabrication technique.

Conclusions:

• The developed diffractive optical element enables efficient generation of 2D Airy beams.
• The laser ablation fabrication method is suitable for producing high-resolution optical elements.
• The device serves as a versatile tool for optical modulation and UV lithography applications.