Laser marking of thin organic films

Abstract

The threshold marking response of a laser-irradiated dye-polymer thin film is described by a simple, thermally thresholding model. The apparent loss of thermal reciprocity is related to active reflectance changes during mark formation. It is shown that incorporation of measured differences between physical and optically detected mark lengths are required for the model to accurately replicate the subsequent marking response. A theoretical expression is derived that permits the estimation of media thermal diffusivity from the measured marking response.

Laser coding on the eggshell using pulsed-laser marking system

“…There are many kinds of investigation on laser processing for the different materials that including: Bartholomeusz and Gupta (1992) proposed investigation thermally threshold model of laser irradiation on dye-polymer thin films. Peligrad et al (2001) proposed investigation the development an analytic model for quality control of laser marking and laser engraving of inhomogeneous materials using a high-power diode laser (HPDL).…”

Laser ablation of solid substrates in a water-confined environment

“…Many studies have been undertaken to investigate laser ablation in vacuum or ambient air. [1][2][3][4][5] On the other hand, only a few studies have been reported for laser ablation at the solid-liquid interface. [6][7][8][9][10] Recently, some studies have shown promoted efficiency for material surface processing by the water confinement regime ͑WCR͒ configuration.…”

On the Possibility of Marking Eggs With a Co2 Laser

“…The method is non-contact, does not require a special working environment and can be easily automated and integrated into production lines. [5,6,7,14,15] The aim of the present study is to analyse the capabilities of one industrial CO2 laser system for marking eggs, to determine the optimal operating intervals for power and processing speed to achieve optimal marking contrast [8].…”