Diamond-Like Carbon Removal laser cleaning visualization showing process effects

Yi-Chun LinPh.D.Taiwan

Laser Materials Processing

Published

Jan 6, 2026

Diamond-Like Carbon Removal

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Diamond-coating contamination poses removal challenges in laser cleaning. Contaminants form unique patterns on diamond surfaces because heat resistance causes uneven buildup during exposure. Layer adheres strongly, so laser pulses struggle to detach it without damaging coating. After initial cleaning, residue persists on edges. Process targets inorganic layers effectively, yet material hardness demands precise control. Contamination exhibits dense attachment, and removal requires adjusted wavelengths for safety. In observations, patterns vary by substrate, so intervals prevent overheating. Buildup is detected early on polished areas. Treatment removes layers gradually, and surface regains uniformity afterward.

Produced Compounds

Hazardous compounds produced during laser cleaning

Affected Materials

Materials where this contaminant commonly appears

Visual Appearance

How this contaminant appears on different material categories

AppearanceOnCategories

Ceramic

Appearance: Contamination presents as dark, smeary residues on ceramic surfaces, dulling the glaze and creating a grimy appearance.
Coverage: Coverage is generally partial and inconsistent, with amounts varying from light films to heavier deposits in specific zones.
Pattern: It often appears in streaks or blotches, following application or removal patterns, and may cluster in recessed areas or edges.

Composite

Appearance: On composites, it appears as dark, streaky residues that can highlight material interfaces and create a mottled, unclean look.
Coverage: Coverage is usually partial and variable, depending on composite composition and exposure, with uneven distribution across the surface.
Pattern: It tends to form irregular patches or lines, following the composite structure or tool paths, and may be concentrated in porous regions.

Concrete

Appearance: It appears as dark, shadowy films or stains on concrete, obscuring the rough texture and natural gray color with a dirty overlay.
Coverage: Coverage is often partial and variable, ranging from isolated patches to broader areas, depending on concrete condition and exposure.
Pattern: Distribution is typically in blotches or streaks, influenced by surface porosity and environmental factors, sometimes forming uniform discolorations.

Fabric

Appearance: On fabric, it shows as dark, stain-like discolorations that may feel slightly stiff or greasy, altering the original color and texture.
Coverage: Coverage is generally sparse and patchy, with amounts varying from light tinges to more pronounced stains in affected areas.
Pattern: It often forms irregular spots or streaks, following weave patterns or application methods, and can be randomly distributed.

Glass

Appearance: On glass, it appears as hazy, translucent films or streaks that reduce clarity and may have a slight gray or smoky tint.
Coverage: Coverage is usually light and uneven, often partial with variations in thickness, leading to differences in transparency across the surface.
Pattern: It typically forms streaks or smudges in the direction of wiping or removal, and can be uniform in thin layers or spotty in thicker accumulations.

Metal

Appearance: Diamond-like carbon removal contamination appears as dull, grayish smudges or streaks on the metal surface, often contrasting with the original shiny or polished finish.
Coverage: Coverage is usually partial and localized, varying from small spots to larger areas depending on the removal method and surface exposure.
Pattern: It typically forms irregular streaks or patches, following the path of removal tools or abrasion, and may concentrate in high-wear areas.

Mineral

Appearance: On minerals, it looks like dark, oily coatings that can mask crystalline structures and natural colors, giving a dull or contaminated sheen.
Coverage: Coverage is usually light and uneven, with variations based on mineral hardness and the extent of removal activities.
Pattern: It commonly forms in patches or thin layers, following mineral cleavage or external contacts, and may be spotty or uniform.

Plastic

Appearance: It looks like faint, grayish films or scratches on plastic, potentially causing a loss of luster and introducing a dirty, matte finish.
Coverage: Coverage is often light and patchy, with variations based on plastic type and the intensity of removal processes.
Pattern: Distribution is typically in streaks or spots, influenced by surface smoothness and mechanical actions, sometimes forming uniform thin layers.

Rubber

Appearance: It manifests as black, greasy smudges or films on rubber, often deepening the natural dark color and adding a slick, contaminated texture.
Coverage: Coverage is typically light to moderate and uneven, with higher amounts in high-contact zones and variations due to rubber elasticity.
Pattern: The contamination commonly appears in smears or spots, aligning with flex points or handling areas, and can be streaky or blotchy.

Semiconductor

Appearance: It appears as microscopic, hazy films or particles on semiconductor surfaces, potentially causing visual defects and interfering with optical properties.
Coverage: Coverage is typically minimal and highly variable, with precise amounts critical to performance, often partial and controlled to avoid damage.
Pattern: Distribution is often in fine spots or uniform layers, influenced by processing steps and contamination sources, and may be concentrated in specific regions.

Specialty

Appearance: On specialty materials, it manifests as tailored discolorations or residues, such as dull films on coatings or smudges on advanced polymers, adapting to material specifics.
Coverage: Coverage is highly variable and material-dependent, ranging from sparse to extensive, with careful control to maintain functionality and appearance.
Pattern: It forms in patterns specific to the material's use, like streaks on high-tech surfaces or patches on custom composites, often irregular or designed.

Stone

Appearance: It shows up as dark, greasy-looking films or discolorations on stone surfaces, potentially masking the natural texture and hues.
Coverage: Coverage is often patchy and variable, ranging from isolated areas to broader sections, depending on stone type and exposure.
Pattern: Distribution is commonly in irregular patches or smears, influenced by surface roughness and cleaning actions, sometimes forming concentrated spots.

Wood

Appearance: On wood, it manifests as dark, sooty stains or smears that can obscure the natural grain and color, giving a dirty or weathered look.
Coverage: Coverage tends to be sporadic and light to moderate, with variations based on wood porosity and the extent of removal efforts.
Pattern: The contamination often appears in blotchy patches or streaks, aligning with wood grain or tool marks, and may be unevenly distributed.

Laser Removal Properties

Laser parameters and removal characteristics

LaserParameters: BeamProfile
gaussian
FluenceRange
maxJCm2: 1.2
minJCm2: 0.4
recommendedJCm2: 0.8
OverlapPercentage
50
Polarization
any
PulseDurationRange
maxNs: 100
minNs: 4
recommendedNs: 10
RepetitionRateKhz
max: 300
min: 20
recommended: 100
SafetyMarginFactor
0.7
ScanSpeedMmS
max: 2000
min: 500
recommended: 1000
SpotSizeMm
max: 0.1
min: 0.02
recommended: 0.05
WavelengthPreference
0: 1064
1: 355
OpticalProperties: AbsorptionCoefficient
wavelength1064Nm: 80000
wavelength355Nm: 450000
wavelength532Nm: 150000
Reflectivity
wavelength1064Nm: 0.25
wavelength355Nm: 0.12
wavelength532Nm: 0.18
RefractiveIndex
imaginaryPart: 0.15
realPart: 2.4
TransmissionDepth
1.25
RemovalCharacteristics: Byproducts
0: [object Object]
1: [object Object]
2: [object Object]
DamageRiskToSubstrate
low
PrimaryMechanism
thermal_ablation
ProcessSpeed
areaCoverageRateCm2Min: 120
typicalScanSpeedMmS: 500
RemovalEfficiency
diminishingReturnsAfter: 3
optimalPasses: 2
singlePass: 0.85
SecondaryMechanisms
0: photochemical
SurfaceQualityAfterRemoval
colorChange: no
residualStress: compressive
roughnessIncrease: minimal
SafetyData: FireExplosionRisk
severity: low
description: Minimal fire risk with standard precautions and adequate ventilation
mitigation: Standard fire safety precautions, extinguisher available within 15m
FumesGenerated
0: [object Object]
1: [object Object]
2: [object Object]
3: [object Object]
ParticulateGeneration
respirableFraction: 0.85
sizeRangeUm: 0.01,10
PpeRequirements
eyeProtection: goggles
respiratory: PAPR
skinProtection: gloves
rationale: Standard protection against workplace hazards
SubstrateCompatibilityWarnings
0: Avoid laser cleaning on substrates containing chlorinated compounds (risk of phosgene generation)
1: Ensure substrate does not contain heavy metals that could vaporize
2: Test for potential hydrogen cyanide generation if nitrogen-containing compounds are present
ToxicGasRisk
severity: moderate
primaryHazards: [object Object],[object Object],[object Object],[object Object]
description: Multiple toxic compounds detected: Carbon Monoxide, Carbon Dioxide, Polycyclic Aromatic Hydrocarbons (PAHs) - requires enhanced protection
mitigation: Half-face or full-face respirator with organic vapor/particulate cartridges, adequate ventilation. WARNING: Polycyclic Aromatic Hydrocarbons (PAHs) - known carcinogen(s), minimize exposure
VentilationRequirements
exhaustVelocityMS: 0.5
filtrationType: HEPA
minimumAirChangesPerHour: 12
rationale: Standard industrial ventilation (12 ACH) for particulate control
VisibilityHazard
severity: moderate
description: Moderate visibility reduction (40-60%), significant particulate haze
source: Respirable fraction: 0.85 (85% of particles <10μm)
mitigation: Ensure clear sight lines, use source extraction, maintain awareness of surroundings
relatedField: particulate_generation.respirable_fraction
ThermalProperties: AblationThreshold
pulseDuration100Ns: 1.2
pulseDuration10Ns: 0.6
wavelength1064Nm: 0.8
DecompositionTemperature
450
HeatAffectedZoneDepth
2.5
MeltingPoint
N/A
SpecificHeat
750
ThermalConductivity
1.5
ThermalDiffusivity
0.8
VaporizationTemperature
1200

Diamond-Like Carbon Removal Dataset

Download Diamond-Like Carbon Removal properties, specifications, and parameters in machine-readable formats

Variables

Safety Data

Characteristics

References

Formats

Download Format

View all Inorganic-coating datasets

License: Creative Commons BY 4.0 • Free to use with attribution •Learn more

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