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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Active aberration- and point-spread-function control in direct laser writing.

Erik H Waller¹, Michael Renner, Georg von Freymann

¹Physics department and research center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany. erik.waller@physik.uni-kl.de

|November 29, 2012

Summary

This summary is machine-generated.

We precisely control light patterns for 3D printing, improving the quality of photonic crystals. This method enhances resolution and optical performance in laser writing applications.

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Area of Science:

Nanotechnology and Materials Science
Optical Engineering
Laser Fabrication

Background:

Direct laser writing (DLW) is a key technique for fabricating 3D micro- and nanostructures.
The point-spread-function (PSF) of optical objectives critically determines the resolution and quality of DLW.
Aberrations in high numerical aperture (NA) objectives can degrade the PSF, limiting fabrication precision.

Purpose of the Study:

To control the point-spread-function (PSF) of high numerical aperture (NA) objectives for direct laser writing (DLW).
To enhance the structural and optical quality of woodpile photonic crystals using aberration correction and amplitude filters.
To investigate the impact of a shaped PSF on 3D resolution, proximity effects, and optical performance.

Main Methods:

Utilized a spatial light modulator (SLM) to actively control and correct aberrations in high NA objectives.
Implemented various amplitude filters in conjunction with aberration correction to modify the PSF.
Fabricated woodpile photonic crystals using the shaped PSF and compared experimental results with numerical simulations.

Main Results:

Successfully controlled the PSF of high NA objectives, enabling precise light pattern shaping.
Demonstrated significant enhancement in the structural and optical quality of woodpile photonic crystals.
Measured PSFs closely matched numerical calculations, validating the aberration correction and filtering approach.

Conclusions:

Aberration correction is essential for the effective use of amplitude filters in DLW.
The shaped PSF improves the achievable 3D resolution and optical performance of woodpile photonic crystals.
This technique offers a pathway to advanced microfabrication with enhanced control over optical properties.