The laser beam absorption lengths of the CO2 laser and the high-power diode laser (HPDL) radiation for ordinary Portland cement (OPC) were determined using Beer-Lambert's law. The absorption lengths for the CO2 laser and the HPDL radiation were 470±22 μm and 177±15 μm, respectively. Absorptivity measurements made at room temperature using spectrometers suitable for each laser wavelength revealed that the OPC surface of the concrete absorbed around 75% of the CO2 laser radiation and around 69% of the HPDL radiation. Since these figures are similar, it is reasonable to assume that absorption length is the principal influence on the melt depth.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films