From Laser-Induced Desorption to Surface Damage

Matthias, E.; Dreyfus, R. W.

doi:10.1007/978-3-642-83945-0_4

Cited by 12 publications

(3 citation statements)

References 88 publications

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“…When a laser beam hits the surface of a strongly absorbing material, the nonreflected part of the light causes a variety of excitations [13], the most prominent one being the rise of temperature at the irradiated spot. Assuming thermal equilibrium between the electrons and the lattice, which is established after a few picoseconds [14], the heat diffusion model can be used to calculate the time evolution of the laser-induced temperature distribution [15,16].…”

Section: Theoretical Model For Data Analysismentioning

confidence: 99%

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Thermal diffusivities measured by photodisplacement detection of transient thermal gratings

Jauregui

Matthias

1992

Appl. Phys. A

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Abstract. Laser-induced transient thermal gratings generated on polycrystalline copper and nickel surfaces were measured by photothermal displacement techniques. The goal was to test the potential of this method for determining thermal diffusivities. It is shown that the literature bulk values of the thermal diffusivities are reproduced by a simplified description of the time decay of the grating in terms of a superposition of decoupled lateral and vertical decay rates. 44.50.+t, 65.70.+y Transient thermal gratings (TTGs) have been used for more than two decades to investigate thermal properties of absorbing liquids and solids [1][2][3]. Gratings on surfaces were first reported by Cachier [4], and later by Hoffman et al. [5], but received only recently revived attention [6,7]. The great advantage of TTGs is that they introduce a periodicity in one direction, suggesting the use of the one-dimensional heat conduction equation for evaluating the data. There were systematic deviations, however, between experimental results obtained by the grating technique and commonly accepted literature values for the thermal diffusivity, for example for ruby [3], colored glass and silicon [7]. We suspect that these deviations are caused by the use of the one-dimensional solution of the heat conduction equation for data analysis, which leads to the simple relation PACS:between the decay time ~y of the grating and its periodicity A, x being the thermal diffusivity. The simplicity of the one-dimensional solution originates from the periodic source term. However, it is a poor approximation since it only takes into account the heat diffusion across the grating and ignores the heat flow into the other two directions, in particular the vertical one. It is the purpose of this paper to point out that by adding the diffusion rates for the other two directions a much better approximation can be achieved, which describes the experimental data very well and leads to perfect agreement between the measured diffusivity and the bulk value quoted in the literature. This will be demonstrated for polished polycrystalline copper and nickel surfaces as test cases.TTGs have hitherto been identified by the diffraction of either the generating light itself [2,4] or of a probe beam [5][6][7][8]. In the experiments reported here we utilized the photodisplacement technique [9][10][11][12] for physically probing the periodic thermal deformation of the grating with a HeNe laser beam of sufficiently narrow beam waist. This technique combines a good signal-to-noise ratio with high accuracy. It measures the grating period directly, and the decay time can be recorded at each point of the grating. The thermal diffusivity can then be extracted from these two quantities without the need of knowing the absolute amplitude of the thermoelastic deformation.

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Section: Theoretical Model For Data Analysismentioning

confidence: 99%

“…the time-resolved change of the reflection angle in the y-direction. The intensity of the pump beam was carefully chosen to avoid any surface damage [13] but to generate at the same time a well developed grating amplitude. Typical energies for the unsplit pump beam were 0.2 mJ/pulse.…”

Section: Experimental Techniquementioning

confidence: 99%

Thermal diffusivities measured by photodisplacement detection of transient thermal gratings

Jauregui

Matthias

1992

Appl. Phys. A

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“…These techniques are applied e.g. for absorption characterization of substrates and thin films [6,7], investigations of thermal properties of thin films {3, 8,9], defect characterization and damage studies [10,11] and more.…”

Section: Introductionmentioning

confidence: 99%

<title>Determination of the thermal conductivity of optical coatings using photothermal deflection technique and finite-element calculations</title>

Krupka¹,

Giesen²

1996

SPIE Proceedings

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Photothermal deflection measurements on optical components for 10.6 ,um are presented. This technique is used to measure the photo induced deformation of the coated surface. The experimental results are compared to finite element calculations which allows the determination of the temperature and deformation profile at every point on the surface and within the sample. This comparison allows the determination of the thermal conductivity of the coatings.Although in the finite element calculations the coatings are approximated as only one single layer, we find a good agreement with the experimental results.The thermal conductivity of typical coated copper mirrors for 10.6 m is found to be up to an order of magnitude lower than those of the corresponding bulk material.

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Photoacoustic Measurement of the Energy Absorption of a Pulsed Nd:YAG Laser at Cu and Al Surfaces

Ito

Nakamura

Hirakawa

1992

Photoacoustic and Photothermal Phenomena III

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From Laser-Induced Desorption to Surface Damage

Cited by 12 publications

References 88 publications

Thermal diffusivities measured by photodisplacement detection of transient thermal gratings

Thermal diffusivities measured by photodisplacement detection of transient thermal gratings

<title>Determination of the thermal conductivity of optical coatings using photothermal deflection technique and finite-element calculations</title>

Photoacoustic Measurement of the Energy Absorption of a Pulsed Nd:YAG Laser at Cu and Al Surfaces

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