Decoding of invisible laser markings using infrared technology

Haferkamp, H.; Jäschke, Peter; Stein, Jeremy C.; Goede, Martin

doi:10.1016/s1350-4495(02)00137-8

Cited by 8 publications

(5 citation statements)

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“…Laser patterning (or laser marking) is an important component in the field of laser processing technology. It has been widely used in surface patterning of metals, ceramics, plastics, and other materials. − At present, laser patterning is usually employed to fabricate logos, images, texts, two-dimensional codes, or barcodes on the surface of materials, ensuring the identification and the traceability of various goods. − Compared with traditional printing, laser patterning is highly efficient, precise, more environmentally friendly, and flexible. Therefore, it is expected to replace conventional printing in many areas in the future.…”

Section: Introductionmentioning

confidence: 99%

Local Controllable Laser Patterning of Polymers Induced by Graphene Material

Wen

Zhou

Zhang

et al. 2016

ACS Appl. Mater. Interfaces

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Graphene has been successfully applied to the field of polymer laser patterning. As an efficient 1064 nm near-infrared (NIR) pulsed laser absorber, only 0.005 wt % (50 ppm) of graphene prepared by mechanical exfoliation endowed polymer materials with very good NIR pulsed laser patterning. Optical microscopy observed that the generated black patterns came from the local discoloration of the polymer surface subjected to the laser irradiation, and the depth of the discolored layer was determined to be within 221-348 μm. The X-ray photoelectron spectroscopy confirmed that the polymer surface discoloration was contributed by the local carbonization of polymers caused by graphene due to its high photothermal conversion capacity. Raman depth imaging successfully detected that the generated carbon in the discolored layer was composed of amorphous carbon and complex sp/sp-carbon compounds containing C≡C or conjugated C═C/C≡C structures. This study also provides a simple guideline to fabricate laser-patterning polymer materials based on graphene. We believe that graphene has broad application prospects in the field of polymer laser patterning. Importantly, this work opens up a valuable, feasible direction for the practical application of this new carbon material.

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Section: Introductionmentioning

confidence: 99%

Local Controllable Laser Patterning of Polymers Induced by Graphene Material

Wen

Zhou

Zhang

et al. 2016

ACS Appl. Mater. Interfaces

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“…In the calibration that utilize charged-couple-device (CCD) to measure the mark contrast and discuss the relationship of marking parameters that including laser average power, peck power, pulse frequency, marking depth, width and contrast. Haferkamp et al (2002) proposed the increasing product imitation and request for plagiarism protection by using laser marking and infrared technology. And define four marking strategies: (1) direct ablative markings, (2) direct non-ablative markings, (3) black paint markings placed below the base coat and (4) Markings based on transparent IR-absorbing paints on top of the base coat.…”

Section: Introductionmentioning

confidence: 99%

Laser coding on the eggshell using pulsed-laser marking system

Chen

Hsiao

Huang

et al. 2009

Journal of Materials Processing Technology

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“…Marking and identification of parts are an indispensable and important link during the production process. With development of laser technology, laser marking is widely applied on industry production [1][2][3][4], but there are two main defects during the marking preparation by laser thermal-effect as follows: (1) the toppers layer of the sample were removed by laser thermal-effect, and there was in the state of tensile residual stress in the sample surface; (2) under the status of alternating load, the cracks were easy to initiate at the marking region in part surfaces, and the cracks resulted in fatigue invalidation.…”

Section: Introductionmentioning

confidence: 99%

Study on the Distribution of Residual Stresses for Nondestructive Marking by Laser Shock Wave

Jin

Luo

Yuan

et al. 2010

KEM

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The marking system by laser shock wave (LSW) based on liquid crystal mask, which differs entirely from marking by laser ablation (or laser thermal effect), was established. Two-dimension (2D) nondestructive markings based on liquid crystal mask were prepared by LSW, and the distribution of residual stresses in laser-shocked region was measured and analyzed. The results showed that tensile residual stresses of sample surface were converted into compressive residual stresses by LSW, which is a nondestructive marking for aviation key parts.

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Decoding of invisible laser markings using infrared technology

Cited by 8 publications

References 0 publications

Local Controllable Laser Patterning of Polymers Induced by Graphene Material

Local Controllable Laser Patterning of Polymers Induced by Graphene Material

Laser coding on the eggshell using pulsed-laser marking system

Study on the Distribution of Residual Stresses for Nondestructive Marking by Laser Shock Wave

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