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Showing papers in "Optics and Lasers in Engineering in 2000"


Journal ArticleDOI
TL;DR: The methodology used to produce a designed macro- and microstructure is described and the state of the art for closed loop DMD is reviewed.

393 citations


Journal ArticleDOI
Lin Li1
TL;DR: In this paper, a review of the direct applications of high-power diode lasers for materials processing including soldering, surface modification (hardening, cladding, glazing and wetting modifications), welding, scribing, sheet metal bending, marking, engraving, paint stripping, powder sintering, synthesis, brazing and machining is presented.

265 citations


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the use of several different types of lasers for scribing polycrystalline materials used for thin-film solar cells: CdTe, CuInGaSe2 (CIGS), ZnO, SnO2, Mo, Al, and Au.

164 citations


Journal ArticleDOI
TL;DR: Laser shot peening has been developed as a surface treatment to metals as mentioned in this paper, which has been shown to induce surface residual stresses comparable to those achieved by conventional shot-peening, but to much greater depths.

151 citations


Journal ArticleDOI
TL;DR: The wavelet analysis provides an efficient tool in numerous signal-processing problems and has been implemented in optical processing techniques, such as in-line holography, and the technique proposed is implemented and experimental results are presented.

141 citations


Journal ArticleDOI
Jae-Do Kim1, Yun Peng1
TL;DR: In this article, the effects of wire feeding direction and position, cladding time, and cladding speed on the quality of cladding layer for laser cladding with wire feeding are studied.

95 citations


Journal ArticleDOI
TL;DR: In this article, an experimental verification of the response of an embedded optical fiber Bragg grating (OFBG) to applied nonhomogeneous strain fields is presented, and the results are compared with analytical calculations, based on the piecewise-uniform period assumption for chirped gratings.

92 citations


Journal ArticleDOI
TL;DR: In this article, the influence of the dimensions of the laser beam spot on weld strength has also been analyzed and the weld process has been characterised by the specific energy required for each thickness, kind of plastic and the resistance of the weld seam.

89 citations


Journal ArticleDOI
TL;DR: The present work includes a laser-based methodology for the cleaning of artworks, with emphasis on the preservation of their structural integrity and identity, and selected examples of this type of applications in a carefully considered methodology are presented.

78 citations


Journal ArticleDOI
TL;DR: In this article, the authors proposed the optoelectronic reconstruction of a hologram that is digitally recorded and transferred to another optical medium, such as liquid crystal cells or liquid crystal matrices.

76 citations


Journal ArticleDOI
TL;DR: In this paper, a digital speckle pattern interferometry and hole drilling combined system is developed to determine the magnitude of the residual stress in a aluminum thin plate subjected to an uniform uniaxial tensile load.

Journal ArticleDOI
TL;DR: In this article, the authors show that the laser fading process removes efficiently indigo-dye from denim support using the beams from the YAG laser (1064nm and its second harmonic 532nm) and CO 2 (10.6μm) lasers.

Journal ArticleDOI
TL;DR: It was found that the error rate predicted by the artificial neural network was smaller than that predicted byThe multiple regression analysis, in terms of the width and depth of the back-bead.

Journal ArticleDOI
TL;DR: In this article, the authors present results obtained from a study of a new thick section laser-cutting process capable of cutting sections up to 50mm thick in the first instance, with power levels less than 2kW whilst maintaining excellent cut quality.

Journal ArticleDOI
TL;DR: In this article, the authors used a double-pulse particle image velocimetry (PIV) with a frequency-doubled YAG laser for in-cylinder flow analysis, as well as Mie-scattering on droplets using a copper vapour laser combined with high-speed filming, and laser-induced fluorescence with an excimer laser for spray and fuel vapour analysis.

Journal ArticleDOI
TL;DR: In this article, a review of integrated photoelasticity and its application for residual stress measurement in glass is given, and the basic theory of the method, two particular cases, the case of weak birefringence and that of constant principal stress axes are picked up.

Journal ArticleDOI
TL;DR: Diverse in-process monitoring techniques based on acoustic, chromatic and intelligent approaches have been developed for laser cleaning not only to achieve the sound-cleaned surface but also to control the process in an automatic manner.

Journal ArticleDOI
TL;DR: A simple optical method to perform profilometry on works of art based on the projection of a Ronchi grating onto the surface to be analyzed, which is free from the errors caused by higher harmonic components of the grating pattern.

Journal ArticleDOI
TL;DR: In this article, the authors discuss some promising concepts based on different pumping techniques and crystal geometries from the viewpoint of attainable beam quality and methods of power scaling for diode-pumped systems.

Journal ArticleDOI
TL;DR: In this paper, the speckle field scattered from the surface is used as information carrier and its change is measured by correlation, and the reliability of the quantitative interpretation of the specckle decorrelation is demonstrated.

Journal ArticleDOI
TL;DR: A new methodology for data reduction in load stepping, which removes the noise points in the domain is presented and a normalization scheme to improve the results has been proposed.

Journal ArticleDOI
TL;DR: In this article, a study of the optomechanical properties of SiO x N y thin films in MOEMS technology is presented, where the authors establish the relationship between the chemical properties, optical performances, micromechanical stress, and growth parameters of deposited films.

Journal ArticleDOI
TL;DR: In this article, the design techniques and dominant methods of fabrication are described for intra-cavity and external beam shaping diffractive elements fabricated in a variety of dielectric and metallic materials for use with a wide range of laser sources.

Journal ArticleDOI
TL;DR: In this article, an attempt has been made to mathematically predict the optimum conditions of laser surface hardening of ADI that can ensure a predominantly martensitic microstructure and preclude partial/complete dissolution of graphite nodules in the laser hardened zone during laser irradiation.

Journal ArticleDOI
TL;DR: In this paper, the single and two deposited metal layers method were proposed to produce the model grating for electron moire method and the accuracy of measuring strain using this method is discussed.

Journal ArticleDOI
TL;DR: In this paper, a nonintrusive optical sensor system was developed for focus control of laser welding, which detects the light generated by the process through the laser delivery optics, and exploits the chromatic aberrations of these optics to detect any laser focal error at the workpiece.

Journal ArticleDOI
TL;DR: Three methods of designing diffractive optical elements (DOE) are compared and the combination of both methods produces a better solution than the iterative method and is faster than using the evolutionary strategy only.

Journal ArticleDOI
TL;DR: In this paper, a stereo vision system was applied to evaluate crack-tip parameters for fracture specimens subjected to a mixed-mode loading (tension and shear) by using a special loading device, the applied remote loading is oriented at an angle with respect to the axis of the crack.

Journal ArticleDOI
TL;DR: In this article, an application of Talbot interferometry for real-time vibration measurement is investigated, where experiments were conducted to measure/monitor out-of-plane motion of a vibrating loudspeaker membrane.

Journal ArticleDOI
TL;DR: In this article, the authors showed that an applied electric field can affect the shielding behavior of the laser-produced plasma during laser welding, and that at optimum field strength, the penetration depth can be increased by about 8% and the width of bead can also be reduced.