Abstract
In this paper we investigate the effects of visible to near infrared (NIR) laser illumination on the optical transmission (OT) and morphological (MC) alterations of thin, curved surfaces of polycarbonate (PC). The second harmonic of Nd:YAG laser (532 nm) and two diode lasers (665 and 980 nm) were used as illuminating sources. The morphological changes of the PC surfaces are determined using atomic force microscopy (AFM), demonstrating the appreciable changes caused by shorter wavelengths (higher energy). When analyzing the OT spectra of PC thin films, a measurable decrease in the OT of the PC samples which were illuminated by 532, 665 and 980 nm, in particular 532 nm, for energy densities greater than 25 J/cm2 can be seen.
Highlights
Polycarbonate (PC) is a product of a linear polycondensation reaction, which has a regular structure
Bisphenol-A polycarbonate (BPAPC) is one of the foremost types of PCs for the production of various transparent materials, factors such as sunlight, humidity and oxygen can degrade the quality of the PCs [5]
In many applications in order to improve the mechanical properties of polycarbonate, a deposition of anti-scratch coating on polycarbonate surface is necessary to protect the surface against common handling scratches
Summary
Polycarbonate (PC) is a product of a linear polycondensation reaction, which has a regular structure. Amorphous PCs have been extensively used to replace the conventional engineering materials (i.e. glasses, metals, etc.) in a wide range of applications such as optical lenses and eye wears [3]. Extensive investigations regarding anti-scratch coating materials, methods and effects of UV photons on them have been undertaken [14]–[16]. Studying the influence of coherent illumination, visible to infrared, on the optical properties and the morphology of coated PCs has remained a subject of interest. For this purpose, the second harmonics of ND:YAG (532 nm) and two diode lasers (665 nm and 980 nm) have been employed as illuminating sources
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