Laser Diamond Cleaving for Atomically Flat {111} Surfaces

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Solution Overview

Problem

Current methods for producing diamond substrates with {111} crystal faces are labor-intensive and result in significant material loss and surface damage, as they rely on chemical vapor deposition and mechanical polishing, which are inefficient and induce unwanted crystal defects.

Innovation Solution

A laser-based system for controlled cleaving of diamonds along the {111} crystallographic plane, using a processor to incrementally reposition and scan a laser beam to generate and propagate cleaves, eliminating the need for polishing and reducing material waste and surface damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If mechanical polishing is used to produce smooth diamond surfaces, then surface roughness is reduced, but material loss increases and subsurface damage is introduced

Engineering Contradiction:

Improvesurface roughnessVSAvoidmaterial loss

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

The patent replaces mechanical polishing with laser ablation to produce smooth diamond surfaces. The laser beam ablates material through thermal vaporization rather than mechanical contact, eliminating subsurface damage and reducing overall material loss while achieving the required surface smoothness for optical and electronic applications

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and parameters of the laser beam during processing - using pulsed laser modes with controlled duration and intensity to selectively remove material. By adjusting laser parameters (pulse width, power, scanning speed), the process achieves smooth surfaces without the mechanical contact that causes subsurface damage

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If mechanical polishing is used to produce smooth diamond surfaces, then surface roughness is reduced, but subsurface damage is introduced

Engineering Contradiction:

Improvesurface roughnessVSAvoidsubsurface damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces mechanical polishing with laser ablation, substituting contact-based mechanical removal with non-contact thermal vaporization. This eliminates the mechanical stresses and scratches that cause subsurface damage while maintaining the ability to produce optically smooth surfaces

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The laser processing induces phase transitions in the diamond material - heating the surface to vaporize material directly from solid to gas phase. This phase change mechanism removes material cleanly without the mechanical deformation and subsurface damage associated with polishing

Inventive Principle:

Principle #36Phase transitions

3Ease of manufacture

If traditional laser ablation is used to cut diamond, then material loss occurs, but the process is simple

Engineering Contradiction:

Improveprocess simplicityVSAvoidkerf loss

Core Design Contradiction:

Ease of manufactureVSLoss of substance

Solution Approach 1:

The patent employs pulsed laser operation with specific duty cycles and repetition rates. The periodic pulsing allows heat accumulation to be controlled, enabling precise material removal with minimal kerf loss while maintaining process simplicity through automated scanning

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The laser beam is focused to a small spot size and scanned along precise paths, removing only the necessary material for cutting or surface treatment. This partial action approach minimizes kerf loss compared to traditional methods while keeping the process straightforward through computer-controlled scanning

Inventive Principle:

Principle #16Partial or excessive action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This method enables the production of large, atomically-flat {111} surfaces with micron-scale precision, reducing process time and improving the quality of diamond substrates for high-power electronics and quantum applications while minimizing material loss and surface defects.

Implementation Method 1

Ablating diamond via high-power lasers has been achieved using a variety of wavelengths which rely on a combination of graphitization and ablation

Methodology Applied

Scientific EffectGraphitization:

Implementation Method 2

Pulsed visible lasers have been previously shown to graphitize and ablate diamond using doubled solid-state lasers with very short pulse durations ranging from 7 ns at 539 nm down to 230 fs at 515 nm

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Data Source

PatentUS12145216B2Systems and methods for laser cleaving diamonds

Publication Date: 2024.11.19 THE TRUSTEES OF THE UNIV OF PENNSYLVANIA

AI summary

A laser is used to controllably generate and propagate cleaves to produce a cleaved surface along the {111} crystallographic plane in diamonds.