First of its kind: a test artifact for direct laser writing

Fritzsche, Sven; Weimann, Christiane; Pauw, Brian R.; Sturm, Heinz

doi:10.1088/1361-6501/acc47a

“…Reflectivity change of materials due to dielectric-to-metallic state change or formation of micro-precipitates could be visualised using polarisation analysis with two perpendicular polarisations [20]. The polarisation-resolved imaging presented here can be used for analysis of 3D polymerised structures where hatching of 3D volume and pulse-to-pulse overlap along a linear scan are important for structural quality of the 3D polymerised object [21].…”

Section: Discussionmentioning

confidence: 99%

Four-polarisation camera for anisotropy mapping at three orientations: micro-grain of olivine

Juodkazis¹,

Kamegaki²,

Smith³

et al. 2023

Preprint

0

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Four-polarisation camera was used to map absorbance of olivine micro-grains before and after high temperature annealing (HTA). It is shown that HTA of olivine xenolith at above 1200◦C in O2 flow makes it magnetised. Different mode of operation of polariscope with polarisation control before and after the sample in transmission and reflection modes was used. The reflection type was assembled for non-transparent samples of olivine after HTA. Sample for optical observation in transmission was placed on an achromatic plastic quarter-wavelength wave-plate as a sample holder. Inspection for sample’s birefringence (retardance) as well as absorbance can be made. A best fit of transmitted intensity or transmittance T (hence absorbance A = − log10 T ) becomes accessible by simple best-fit using only three orientations (from measured four orientations by the camera). When intensity of transmitted light at one of the orientations was very low due to cross-polarised condition (polariser-analyser arrangement), the three-points fit can be used. Three-point fit in transmission and reflection modes was validated for T (θ) = Amp × cos(2θ − 2θshif t) + of f set, where amplitude Amp, offset of f set and orientation azimuth θshif t are extracted for each pixel via the best fit.

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“…Reflectivity change of materials due to dielectric-to-metallic state change or formation of micro-precipitates could be visualised using polarisation analysis with two perpendicular polarisations [20]. The polarisation-resolved imaging presented here can be used for analysis of 3D polymerised structures where hatching of 3D volume and pulse-to-pulse overlap along a linear scan are important for structural quality of the 3D polymerised object [21].…”

Section: Discussionmentioning

confidence: 99%

Four-polarisation camera for anisotropy mapping at three orientations: micro-grain of olivine

Juodkazis¹,

Kamegaki²,

Smith³

et al. 2023

Preprint

0

View full text Add to dashboard Cite

Four-polarisation camera was used to map absorbance of olivine micro-grains before and after high temperature annealing (HTA). It is shown that HTA of olivine xenolith at above 1200◦C in O2 flow makes it magnetised. Different mode of operation of polariscope with polarisation control before and after the sample in transmission and reflection modes was used. The reflection type was assembled for non-transparent samples of olivine after HTA. Sample for optical observation in transmission was placed on an achromatic plastic quarter-wavelength wave-plate as a sample holder. Inspection for sample’s birefringence (retardance) as well as absorbance can be made. A best fit of transmitted intensity or transmittance T (hence absorbance A = − log10 T ) becomes accessible by simple best-fit using only three orientations (from measured four orientations by the camera). When intensity of transmitted light at one of the orientations was very low due to cross-polarised condition (polariser-analyser arrangement), the three-points fit can be used. Three-point fit in transmission and reflection modes was validated for T (θ) = Amp × cos(2θ − 2θshif t) + of f set, where amplitude Amp, offset of f set and orientation azimuth θshif t are extracted for each pixel via the best fit.

show abstract

“…Reflectivity change in materials due to dielectric-to-metallic state change or formation of micro-precipitates could be visualised using polarisation analysis with two perpendicular polarisations [25]. The polarisation-resolved imaging presented here can be used for analysis of 3D polymerised structures where hatching of the 3D volume and pulse-to-pulse overlap along a linear scan are important for the structural quality of the 3D polymerised object [26]. Laser-ablated targets in liquids form chains of magnetised nanoparticles [27,28] whose orientation can be recognised even below the spatial resolution using the proposed polarisation analysis [5].…”

Section: Discussionmentioning

confidence: 99%

Four-Polarisation Camera for Anisotropy Mapping at Three Orientations: Micro-Grain of Olivine

Kamegaki,

Smith,

Ryu

et al. 2023

Coatings

1

0

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A four-polarisation camera was used to map the absorbance of olivine micro-grains before and after high-temperature annealing (HTA). It is shown that HTA of olivine xenoliths at above 1200 °C in O2 flow makes them magnetised. Different modes of operation of the polariscope with polarisation control before and after the sample in transmission and reflection modes were used. The reflection type was assembled for non-transparent samples of olivine after HTA. The sample for optical observation in transmission was placed on an achromatic, plastic, quarter-wavelength waveplate as a sample holder. Inspection of the sample’s birefringence (retardance), as well as absorbance, was undertaken. The best fit for the transmitted intensity or transmittance T (hence, absorbance A=−log10T) is obtainable using a simple best fit with only three orientations (from the four orientations measured by the camera). When the intensity of transmitted light at one of the orientations is very low due to a cross-polarised condition (polariser–analyser arrangement), the three-point fit can be used. The three-point fit in transmission and reflection modes was validated for T(θ)=Amp×cos(2θ−2θshift)+offset, where the amplitude Amp, offset offset, and orientation azimuth θshift were extracted for each pixel via the best fit.

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First of its kind: a test artifact for direct laser writing

Cited by 5 publications

References 46 publications

Four-polarisation camera for anisotropy mapping at three orientations: micro-grain of olivine

Four-polarisation camera for anisotropy mapping at three orientations: micro-grain of olivine

Four-polarisation camera for anisotropy mapping at three orientations: micro-grain of olivine

Four-Polarisation Camera for Anisotropy Mapping at Three Orientations: Micro-Grain of Olivine

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