Parallel direct laser writing in three dimensions with spatially dependent aberration correction.

Area of Science:

• Optics and Photonics
• Materials Science
• Laser Technology

Background:

• Parallel three-dimensional direct laser writing offers advanced fabrication capabilities.
• Aberrations in holographic optical elements can limit resolution and accuracy.
• Chromatic aberration and refractive index mismatch are key challenges.

Purpose of the Study:

• To propose and validate a hologram design process for reducing aberrations in 3D direct laser writing.
• To minimize hologram diffractive power while maintaining parallelization for reduced focal distortion.
• To address issues like zero diffraction order and refractive index mismatch.

Main Methods:

• Hologram design optimization focusing on minimizing diffractive power.
• Analysis of chromatic aberration and its impact on focal distortion.
• Investigation of aberrations arising from refractive index mismatches.
• Experimental fabrication and characterization of designed holograms.

Main Results:

• Successful reduction of aberrations in hologram design for laser writing.
• Demonstrated minimization of diffractive power without compromising parallelization.
• Fabrication results in diamond, fused silica, and lithium niobate validate the approach.

Conclusions:

• The proposed hologram design process effectively reduces aberrations in parallel 3D direct laser writing.
• Minimizing diffractive power is a viable strategy for mitigating focal distortion and chromatic aberration.
• The method shows promise for high-precision laser fabrication in various optical materials.