Efficient speckle-free laser marking using a spatial light modulator

Krystian Wlodarczyk; Jarno J.J. Kaakkunen; Pasi Vahimaa; Duncan P. Hand

doi:10.1007/s00339-013-8186-1

Efficient speckle-free laser marking using a spatial light modulator

Krystian Wlodarczyk (Corresponding Author), Jarno J.J. Kaakkunen, Pasi Vahimaa, Duncan P. Hand

VTT Technical Research Centre of Finland

Research output: Contribution to journal › Article › Scientific › peer-review

13 Citations (Scopus)

Abstract

An approach for laser marking surfaces using a liquid-crystal-based spatial light modulator (LC-SLM) for beam patterning and manipulation is presented, designed to avoid the speckle interference problem which is a typical drawback of current SLM-based laser marking processes. In our approach, the LC-SLM is used to generate complex twodimensional micropatterns (e.g., 20 9 20 datamatrices) with overall dimensions of\320 by 320 lm. The micropatterns are generated in a series of 16 steps, using a Fresnel zone lens (FZL) combined with a computer-generated hologram (CGH); for each step the whole kinoform (FZL ? CGH) is spatially shifted off-axis by a different amount of pixels to build-up the required pattern. In comparison with other SLM-based laser marking approaches already reported in the literature, our method not only eliminates (or at least significantly reduces) unwanted speckle interference but also reduces the laser power required for marking.

Original language	English
Pages (from-to)	111-118
Journal	Applied Physics A: Materials Science and Processing
Volume	116
Issue number	1
DOIs	https://doi.org/10.1007/s00339-013-8186-1
Publication status	Published - 2014
MoE publication type	A1 Journal article-refereed

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abstract = "An approach for laser marking surfaces using a liquid-crystal-based spatial light modulator (LC-SLM) for beam patterning and manipulation is presented, designed to avoid the speckle interference problem which is a typical drawback of current SLM-based laser marking processes. In our approach, the LC-SLM is used to generate complex twodimensional micropatterns (e.g., 20 9 20 datamatrices) with overall dimensions of\320 by 320 lm. The micropatterns are generated in a series of 16 steps, using a Fresnel zone lens (FZL) combined with a computer-generated hologram (CGH); for each step the whole kinoform (FZL ? CGH) is spatially shifted off-axis by a different amount of pixels to build-up the required pattern. In comparison with other SLM-based laser marking approaches already reported in the literature, our method not only eliminates (or at least significantly reduces) unwanted speckle interference but also reduces the laser power required for marking.",

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AU - Hand, Duncan P.

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Efficient speckle-free laser marking using a spatial light modulator

Abstract

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