Highly sensitive photothermal spectroscopy for the determination of residual absorption
When components for nonlinear optics and laser technology are exposed to high (laser) light intensities, already very low absorptions, such as those still occurring in high-purity materials, can cause local heating. This results in malfunctions or even permanent damage of the components. Therefore, even low absorptions in the range of a few parts-per-million need to be detected before the components are used.
Fraunhofer IPM uses photothermal spectroscopy as a highly sensitive measurement method to determine residual absorption. With this method, both volume materials and dielectric coatings can be analized with ppm sensitivity.