Temperature profiles induced by a scanning cw laser beam

Moody, John; Hendel, R.

doi:10.1063/1.331217

Cited by 226 publications

(29 citation statements)

References 5 publications

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“…Their results showed that with prior knowledge of the thermal conductivity, accurate temperature can be calculated and are valid for any material. Moody and Handel [5] as well used a continuous wave (CW) elliptical laser beam using an improved formalism of the Kirchhoff transformation to evaluate the temperature profiles on a silicon substrate. Thermal conductivity, diffusivity, and the surface reflection were considered as important functions in the analysis.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modelling of the fibre laser surface processing of a zirconia engineering ceramic by means of three-dimensional finite-element analysis

Shukla

Lawrence

2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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DOI: 10.1243/09544062JMES2434Abstract: The thermal effects of fibre laser surface treatment on a ZrO 2 engineering ceramic were studied using a computational finite-element model (FEM). Temperature increases on the surface and the bulk of the ZrO 2 during the fibre laser processing were measured using an infra-red thermometer and specifically located thermocouples. The results showed an error of 5 per cent with the surface and 18 per cent within the bulk of the ZrO 2 when comparing the experimental readings with those of the FEM. The FEM revealed a relationship between the traverse speed, power density, time, depth, and the temperature during various stages of the fibre laser surface treatment of the ZrO 2 . By utilizing data obtained from a thermogravimetry-differential scanning calorimetry (TG-DSC), the FEM predictions of the temperature distribution were used to map phase transformations and significant events occurring during the fibre laser surface treatment of the ZrO 2 . The mapping revealed that the fibre laser surface treatment generally resulted in a phase transformation of the ZrO 2 at various temperatures changes as further shown in the article.

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Section: Introductionmentioning

confidence: 99%

Mathematical modelling of the fibre laser surface processing of a zirconia engineering ceramic by means of three-dimensional finite-element analysis

Shukla

Lawrence

2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…For most materials, the thermally-induced reflectance change actually results from thermally-induced absorption coefficient change. According to [26], the reflectance of Si thin film is a function of temperature. The reflectivity change can be expressed as where T m is the initial melting temperature, T f is the boiling point temperature, and R(T) is the reflectivity.…”

Section: Read-only Super-resolution Optical Disks With Thermally Indumentioning

confidence: 99%

Applications of Nonlinear Super-Resolution Thin Films in Nano-optical Data Storage

Wei

2014

Springer Series in Optical Sciences

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Optical storage is very useful for high-definition digital television, data distribution, and memory. With the development of information technology, the capacity of optical storage devices is required to become larger and larger. Correspondingly, the density is also required to become higher and higher. In order to improve the density, one has to reduce the information bit size. The size is determined by the optical diffraction limit. That is, D ∼ 1.22 /NA, where D is the size of the focused spot, laser wavelength in vacuum, and NA the numerical aperture of optical pickup. In order to improve the capacity and density of optical storage devices, one has to shorten the laser wavelength and increase the numerical aperture of optical pickup. However, a larger NA will reduce the focal depth of pickup and increase comatic aberration when the disk tilts against the optical axis. So far, for farfield optical storage, the NA of pickup has been very close to the theoretical limit (NA = 1). To reduce the mark size, a short wavelength laser source must be used. The laser wavelength has been decreased from 780 nm for compact discs to 405 nm for blue ray disks. Further shortening the laser wavelength is difficult due to the high product cost and low transmission of general optical elements at wavelength below 360 nm.In this regard, the near-field optical probe is a very good method to generate small spot due to avoidance of the diffraction limit, and it can also record nanometric information marks. However, the low optical transmission and some problems in controlling the near-field distance between the probe tip and the sample surface meet difficulties in application to the high-speed rotation optical disk system. The solid immersion lens near-field method can obtain a subwavelength spot and produce nanometric information marks. It can also maintain a higher optical

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“…Nissim et al [10] presented an analy-tical solution for a moving elliptical Gaussian heat source, which accounted for the temperature de-pendence of thermal conductivity. Their model was generalized by a numerical algorithm set up by Moody and Hendel [11].…”

Section: Governing Equationmentioning

confidence: 99%

Temperature fields in the fusion zone induced by a moving electron beam

Lee

2007

J Mech Sci Technol

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An analytical model is developed to investigate the heat transfer in the fusion zone during electron-beam welding. The keyhole produced by an electron-beam is assumed to be a paraboloidof revolution and the profile of the intensity of an electron beam is supposed to be Gaussian distribution. In order to obtain an analytical solution, a quasi-steady heat conduction Eq. is utilized to analyze the heat transfer in the workpiece and the parameter approximating convection is proposed to account for the effect of heat convection of molten metal. Considering the momentum balance at the bottom of the keyhole but neglecting the absorption in the plume, an analytical solution is obtained for semi-infinite workpieces. The effects of various parameters on the temperature distribution are also discussed in this study.

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Temperature profiles induced by a scanning cw laser beam

Cited by 226 publications

References 5 publications

Mathematical modelling of the fibre laser surface processing of a zirconia engineering ceramic by means of three-dimensional finite-element analysis

Mathematical modelling of the fibre laser surface processing of a zirconia engineering ceramic by means of three-dimensional finite-element analysis

Applications of Nonlinear Super-Resolution Thin Films in Nano-optical Data Storage

Temperature fields in the fusion zone induced by a moving electron beam

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