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Related Experiment Video

Updated: Dec 15, 2025

$High Pressure Single Crystal Diffraction at PX^2$

High Pressure Single Crystal Diffraction at PX^2

Published on: January 16, 2017

Diffractive optical elements in single crystal diamond.

Thibault Wildi, Marcell Kiss, Niels Quack

|July 8, 2020

Summary

This summary is machine-generated.

Researchers designed and fabricated novel diffractive optical elements (DOEs) using single crystal diamond. These diamond DOEs precisely shape laser beams for applications like copper welding.

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Area of Science:

Optics and Photonics
Materials Science
Nanofabrication

Background:

Diffractive Optical Elements (DOEs) are crucial for manipulating light.
Single crystal diamond offers unique optical and mechanical properties.
Precise beam shaping is essential for advanced manufacturing processes like laser welding.

Purpose of the Study:

To design, fabricate, and characterize near-field binary phase transmission DOEs in single crystal diamond.
To develop diamond-based beam shapers for specific applications, such as creating uniform top-hat profiles.
To evaluate the performance of fabricated DOEs for industrial use.

Main Methods:

Numerical optimization of DOE designs using the iterative Fourier transform algorithm (IFTA).
Fabrication using hardmask deposition (α-Si), electron-beam lithography, and oxygen plasma-based diamond reactive ion etching.
Characterization via scanning electron microscopy (SEM) and atomic force microscopy (AFM).

Main Results:

Successfully fabricated binary phase relief patterns on single crystal diamond substrates.
Experimental characterization confirmed the precise formation of designed DOE structures.
Demonstrated excellent uniformity of the top-hat beam profile at a wavelength of 532 nm.

Conclusions:

Single crystal diamond is a viable material for fabricating high-performance DOEs.
The developed fabrication process enables the creation of complex beam-shaping optics.
The resulting diamond DOEs meet the stringent requirements for applications such as copper welding.